What amazes me about your projects is your ability to see them through to successful completion. Too often, I can take my DIY projects to 85%, but overcoming the final 15% is always a challenge. Your Chuck and Rudy are essential to your success, highlighting the importance of building a strong network of exceptional people.
@@miscellaneousHandle I went into the Atari ecosystem for the next 10 years, until my first home built 386 PC clone. ST was amazing but the writing was on the wall.
I have been upgrading my PET for decades. It currently has a 5950X with an RTX4070 in it. I used a flat panel LCD as a screen, cleared out the entire interior, and replaced them with modern components and vented the rear of the monitor section for airflow. The keyboard was the hardest part to address. It was a surprisingly easy and fun project.
On "Why does isopropyl alcohol take longer to dry with a compressor than water?" My suspicion is that since most compressors collect atmospheric water in the storage tank. If you don't have an inline dryer in the compressor, this water ends up in the compressed air stream, and with alcohol being hydroscopic, it joins with the alcohol on the board, increasing its volume (rather that making it evaporate faster). You can check this theory by using a high flow fan instead of the compressor and see which one dries faster. That's my working theory anyway... ;-)
My thought was that the quick evaporation of the alcohol brought the surface temp to below the dew point. The alcohol is evaporated quickly but it leaves the board condensing water out of the air until the board is above the dew point.
@@oldbuzzardvideo1399I was thinking the same thing. I've noticed that contact cleaner behaves this way, evaporating quickly, cooling the surface, and causing water to condense. Quite annoying.
My thought is different surface tension. Water's strong tension means it balls up and is blown away, but more sticky alcohol stays on to the board until it evaporates.
My friend and I copied in all the hex codes from some magazine into the low level CPU program on the PET that our school got, when we were in 4th grade. Out came space invaders!
My dad worked in an "assembly line" computer manufacturer back in the 80s. I got several informal tours. My dad's silly job was to apply a water soluble "solder mask" to all metal components like edge connectors (gold fingers) and power supply connection points. As the boards were populated with chips and components by big automated robots and then put on a conveyor and passed over a "flow solder" machine. A literal fountain of molten solder would instantly solder all the components at once. The boards were then put in an industrial dish washer to wash off the solder masking material that looked like dried ketchup. Then they would "bake" them in a low temp oven to dry them out. Generally speaking, water on electronics is perfectly fine as long as there is no power applied. Cool video.
It depends on what kind of component it is. Many components can handle it without problems, but some will either degrade or be destroyed, regardless of whether there is power or not. If the factory produced circuit boards with such sensitive components, they were assembled after washing.
@@a4d9 Of course today. But this was 1980's era computers. Of course, they did have rows of technicians to hand solder certain components that wouldn't work in the automated assembly robots, or like you said, too sensitive for the flow solder and washing process. I had one of the systems from my dad's employer from a friend of his that mentored me in my interest in computers back then. He built it out of spare parts from the "reject" bin due to cosmetic or minor defects. It was a Zilog Z80 based system with I think 32 kilobytes of RAM and two 5 1/4" floppy drives that could boot CP/M and run MBASIC. I was one of the first nerds to turn in my homework using Wordstar and a Epson dot-matrix printer. My nickname was "Space Cadet."
PET - BBC Micro - Atari ST 1024FTM - Atari ST Mega4 (got very into MiNT on the STs) - various PCs all of which were extensively tweaked over the years + honorable mention to the several raspberry PIs that I have running things around my house.
The PET was the first computer I saw in grade 7 and something about it fascinated me. I signed up for "computer time" before and after school (I was the first kid to arrive at school and the last to leave most days). I was hooked once it dawned on me that I could make that computer do anything I wanted with enough time and knowledge. First home computer was a VIC-20 then the range of Commodore machines but I never owned a PET myself but I want one. Thanks for the look at these rare machines.
Back in my Uni student days I spilt milk in my BBC micro and my landlady got quite a shock to fins its disassembled parts drying in her bath after I put them all through the shower! No compressed air or IPA, I just drained them off and left them in the sun. The machine didn't miss a beat.
Awsome. I remember working on my 64 in late 80,s. I forgot all of it now though. Very awesome to see you taking the time to fix a legendary machine 👍👍👍
You need a water filer on the air line, the alcohol is attracting the motor from the compressor. Their little cheap inline ones with a stone, I use them when I paint with a gun. Also tip after draining the pressure out of the compressor unscrew the vale completely and pour the water, store with the vale off for max life because they can fill right up over time and rust out from the inside out and explode without warning.
I’ve spent many long, wonderful, nights working with one of those. First real experience with APL; now I wish I had delved into Cobol too. Unfortunately, I discarded it almost 20 years ago:-( Great work restoring these two!
I actually wrote code on these in 1979. Before that my first lines of code were written on an hp with a led display and cassette deck as a storage medium. You could attach it to a special typewriter to get a print out. You now know how old I am.
Desoldering with fresh solder is easier due to presence of flux. In case of newer devices - they don’t contain leaded solder so adding fresh, leaded solder also helps. Cool vid!
Does this ever bring back memories! I cut my electronics and programming teeth first on an 8k PET, then my Dad upgraded to the 32k SuperPet. He was a High School math teacher, and had a degree in Math and Computer Science. In the late '70's to early '80's, He founded the computer program at the Highschool and as a 14 year old, I helped at a night school program that he also developed. He wrote a program that simulated a nuclear reactor, and because of the limited space in RAM he used the tape drive as swap space. Together we created a switching interface to a standard tape recorder so that an audio track would synchronize with the animation. I've been working in I.T. ever since. My Dad passed in 2000 after 12 year battle with early onset Alzheimer's disease. I will be forever grateful for the love of learning that he instilled in us. Now I'm months away from retirement. I'm in my 60's now and am passing the torch on to my grandson.
I added a reset button to my 8032, drilling a hole in the front of the case for the momentary-open switch. This was the best, simplest upgrade I did on that old computer. Why they didn't have a reset button on the computer already is beyond me.
my C64 had reset button, a stop switch and later a ROM switch knob. The 1541 had address switches. I needed the ROM switching to have an SFD1001 work with the C64...
Down here in the mid south we call them jumper wires. I believe if somebody would have ever called them bodge, they might just get ran off. I think though that bodge means a temporary fix...but yours appear to be permanent jumpers.
I have a SuperPET sitting in storage... thinking it's time to pull it out too. Also with it are a PET 2001, and a PET 4096 with the rare purple screen.
kludge [klo͞oj] noun an ill-assorted collection of parts assembled to fulfill a particular purpose. Is that the word you're looking for Dave? Also, I'm guessing the evaporative cooling with alcohol drives the surface temp below the dew point, and the board has to warm to above the dew point to quit condensing water out of the air. Cheers!
It's difficult to get ethanol to 100% purity because it wants to loose-bond with water. Alcohol, with water loosely bonded to it, will evaporate a lot faster than just water, when hitting it with compressed air. Ergo, ethanol is a good way to clean up really stubborn water infiltration.
I remember working with the PET back in 1979 in high school. They were to be an upgrade from an old IBM systems. Fond memories of cursing while learning to program
2:30 Haha. Reminds me of a customer's (a fire department) IT manager who on a semi-regular basis would gather up all the Wyse 50 keyboards from the stations, completely disassemble them and run them through the HQ's dishwasher. Keys would go in the silverware holders, PC boards and cases fit nicely in the racks like plates. It did work to keep all the diesel dust from accumulating too much.
To reduce the chances of lifting traces when removing a chip: after you’ve desoldered the pins, use a hot air rework station to uniformly heat the board around the pins. The chip should then fall out under its own weight. Warnings: 1) if it takes more than around 2 minutes, the hot air could warp the PCB. 2) Hot air will melt plastic in the vicinity, so use kapton tape to cover nearby slots and connectors.
Dave, For desoldering, use a dab of flux paste to protect the PCB from unnecessary damage. The flux paste acts as a thermal conductivity medium to spread the heat evenly. 🎉
Whoa. I saw a SuperPET at a computer show once but I thought it was something someone had hacked together themselves and pasted the "super" badge on. I didn't know this was a real computer until now XD
There have been numerous occasions at work where I have been hot air blasting PCBs using the hand dryers in the toilets and people have given me very strange looks. It is a good way to get rid of flux cleaner (especially around pH amplifiers).
My PET 4016 is still working fine. I upgraded it to 32k at some point, its a bit hard to remember when as I must have bought it around 44 years ago 😅😂 Still need to fix the tape player but the single floppy still works fine.
It's amazing how radios, TV's, phone systems, vacuum tubes, transistors, etc.... used to be made in the US. My grandparents met in a factory assembling boards for transistorized PBX systems while working for ATT. My grandpa gave me a reject board as a kid and I wanted to make it work, but I was like 8, so I couldn't do anything with it 😂
These are a number of years older than i am, and i have no connection to them but its fun to watch Dave do stuff and its basic enough i still kind of understand 25% of it. I have my own local AI now to torture.
I love the PETs and superPETs... I didn't know you were from Regina, I seem to be running across other Saskatchewan people all over the place this week
The original PET models (after the 2001?) were named with two sets of dual-digit numbers, like 8032 or 4016. The first two numbers "80" or "40" represented the number of on-screen character columns. The second set of numbers (I think up to 32) identified the amount of RAM (in K) shipped with the machine. Thus an 8032 had 80 columns of text and 32K of RAM.
I barely even remember that the SuperPET was a thing. And rinsing a motherboard in WATER(?!?!?!?). Didn't think that was possible. I've learned something!
I know that the lead will slowly oxidize in leader solder, especially if there's stuff like water getting to it. Lead oxide won't melt at any reasonable temperature.
Evaporation experience with IPA may depend on its concentration. Tech tip: IPA in concentrations of 60% to 90% is more effective at killing germs that over 90%. The water breaks down the cell structure.
I remember when the PET came out back in 1976. I didn't know they made a Super PET. Where is the disk drive? I didn't see it in the video. It cool you can make these old machines work. The first computer I worked on was an IBM 1401. Not likely to find one of those in some one's garage.
its BOD-GE .. bodging is how most of us (at least in Britain) without formal training or any inherent skill perform any repair on anything from electronics to shed roofs ..
Nice video, although I've never worked on (or even seen) a Pet before, I've fixed and restored quite a few old machines. I've never heard "bodge" pronounced any other way than "BAH-j". It can be almost impossible removing parts from these old boards without breaking something, as depending on the manufacture, many of them are super cheaply made. Combine that with ground planes and soldered RF shielding and you can have a real nightmare.
I dearly wish someone would reverse engineer the SuperPET boards for the 8032 so we could buy and solder them up. Wanted one for decades for my system. :)
Dave, you do PETs? Wow, still have my Commodore 64 with the 1541, and a few 5.25" disks, as well as the cassette drive, but haven't tried to power it in years (and yes, I have a couple of CRT's still working). Hope to have some time to tinker with it someday.
The PET was the first computer I actually used, a 4032, so I located a faulty one and rebuilt it on my channel. It was very nostalgic getting it going but then I don't have much use for them so move on :)
A friend of mine had a SuperPET that he added a external toggle to switch from 80 to 40 column mode. I don't know what he did exactly but I know it's possible.
What eproms can you make use of here? I have a lot of the 27xx and otp versions too. Need to find good homes for them as for now they sit in boxes in Astro's "The bunny" room.
'Bodge' rhymes with 'dodge'. Bodge means pretty much the same thing as 'kludge', which is the more American expression. Both refer to quick & dirty hacks.
Thanks for the shout-out!! It was great working on and getting those Super PET boards alive again.
What amazes me about your projects is your ability to see them through to successful completion. Too often, I can take my DIY projects to 85%, but overcoming the final 15% is always a challenge.
Your Chuck and Rudy are essential to your success, highlighting the importance of building a strong network of exceptional people.
What a treat. Thank you. I started on a VIC-20 in 1980.
Same
Same here!!
same. vic-20 to a //e to a career in software
@@miscellaneousHandle I went into the Atari ecosystem for the next 10 years, until my first home built 386 PC clone. ST was amazing but the writing was on the wall.
Same!
I have been upgrading my PET for decades. It currently has a 5950X with an RTX4070 in it. I used a flat panel LCD as a screen, cleared out the entire interior, and replaced them with modern components and vented the rear of the monitor section for airflow. The keyboard was the hardest part to address. It was a surprisingly easy and fun project.
On "Why does isopropyl alcohol take longer to dry with a compressor than water?" My suspicion is that since most compressors collect atmospheric water in the storage tank. If you don't have an inline dryer in the compressor, this water ends up in the compressed air stream, and with alcohol being hydroscopic, it joins with the alcohol on the board, increasing its volume (rather that making it evaporate faster). You can check this theory by using a high flow fan instead of the compressor and see which one dries faster. That's my working theory anyway... ;-)
My thought was that the quick evaporation of the alcohol brought the surface temp to below the dew point. The alcohol is evaporated quickly but it leaves the board condensing water out of the air until the board is above the dew point.
@@oldbuzzardvideo1399I was thinking the same thing. I've noticed that contact cleaner behaves this way, evaporating quickly, cooling the surface, and causing water to condense. Quite annoying.
It's also true that air compressors have issues with water condensation, so...
My thought is different surface tension. Water's strong tension means it balls up and is blown away, but more sticky alcohol stays on to the board until it evaporates.
My friend and I copied in all the hex codes from some magazine into the low level CPU program on the PET that our school got, when we were in 4th grade. Out came space invaders!
My dad worked in an "assembly line" computer manufacturer back in the 80s. I got several informal tours. My dad's silly job was to apply a water soluble "solder mask" to all metal components like edge connectors (gold fingers) and power supply connection points. As the boards were populated with chips and components by big automated robots and then put on a conveyor and passed over a "flow solder" machine. A literal fountain of molten solder would instantly solder all the components at once. The boards were then put in an industrial dish washer to wash off the solder masking material that looked like dried ketchup. Then they would "bake" them in a low temp oven to dry them out. Generally speaking, water on electronics is perfectly fine as long as there is no power applied. Cool video.
It depends on what kind of component it is. Many components can handle it without problems, but some will either degrade or be destroyed, regardless of whether there is power or not.
If the factory produced circuit boards with such sensitive components, they were assembled after washing.
@@a4d9 Of course today. But this was 1980's era computers. Of course, they did have rows of technicians to hand solder certain components that wouldn't work in the automated assembly robots, or like you said, too sensitive for the flow solder and washing process. I had one of the systems from my dad's employer from a friend of his that mentored me in my interest in computers back then. He built it out of spare parts from the "reject" bin due to cosmetic or minor defects. It was a Zilog Z80 based system with I think 32 kilobytes of RAM and two 5 1/4" floppy drives that could boot CP/M and run MBASIC. I was one of the first nerds to turn in my homework using Wordstar and a Epson dot-matrix printer. My nickname was "Space Cadet."
Fond memories. My mum was a teacher and brought a PET back for the summer holidays. I was hooked!
PET - BBC Micro - Atari ST 1024FTM - Atari ST Mega4 (got very into MiNT on the STs) - various PCs all of which were extensively tweaked over the years + honorable mention to the several raspberry PIs that I have running things around my house.
The PET was the first computer I saw in grade 7 and something about it fascinated me. I signed up for "computer time" before and after school (I was the first kid to arrive at school and the last to leave most days). I was hooked once it dawned on me that I could make that computer do anything I wanted with enough time and knowledge. First home computer was a VIC-20 then the range of Commodore machines but I never owned a PET myself but I want one. Thanks for the look at these rare machines.
Back in my Uni student days I spilt milk in my BBC micro and my landlady got quite a shock to fins its disassembled parts drying in her bath after I put them all through the shower! No compressed air or IPA, I just drained them off and left them in the sun. The machine didn't miss a beat.
Great Video Dave and bodge wires !
Awsome. I remember working on my 64 in late 80,s. I forgot all of it now though. Very awesome to see you taking the time to fix a legendary machine 👍👍👍
You need a water filer on the air line, the alcohol is attracting the motor from the compressor. Their little cheap inline ones with a stone, I use them when I paint with a gun. Also tip after draining the pressure out of the compressor unscrew the vale completely and pour the water, store with the vale off for max life because they can fill right up over time and rust out from the inside out and explode without warning.
I’ve spent many long, wonderful, nights working with one of those. First real experience with APL; now I wish I had delved into Cobol too. Unfortunately, I discarded it almost 20 years ago:-( Great work restoring these two!
I actually wrote code on these in 1979. Before that my first lines of code were written on an hp with a led display and cassette deck as a storage medium. You could attach it to a special typewriter to get a print out. You now know how old I am.
Desoldering with fresh solder is easier due to presence of flux. In case of newer devices - they don’t contain leaded solder so adding fresh, leaded solder also helps. Cool vid!
I used to clean keyboards by removing the electronics & put them in the dishwasher. Worked great.
Does this ever bring back memories! I cut my electronics and programming teeth first on an 8k PET, then my Dad upgraded to the 32k SuperPet.
He was a High School math teacher, and had a degree in Math and Computer Science. In the late '70's to early '80's, He founded the computer program at the Highschool and as a 14 year old, I helped at a night school program that he also developed.
He wrote a program that simulated a nuclear reactor, and because of the limited space in RAM he used the tape drive as swap space. Together we created a switching interface to a standard tape recorder so that an audio track would synchronize with the animation. I've been working in I.T. ever since. My Dad passed in 2000 after 12 year battle with early onset Alzheimer's disease. I will be forever grateful for the love of learning that he instilled in us. Now I'm months away from retirement.
I'm in my 60's now and am passing the torch on to my grandson.
The 8 bit guy would be proud of your work. :-)
I added a reset button to my 8032, drilling a hole in the front of the case for the momentary-open switch. This was the best, simplest upgrade I did on that old computer. Why they didn't have a reset button on the computer already is beyond me.
my C64 had reset button, a stop switch and later a ROM switch knob. The 1541 had address switches. I needed the ROM switching to have an SFD1001 work with the C64...
Down here in the mid south we call them jumper wires. I believe if somebody would have ever called them bodge, they might just get ran off. I think though that bodge means a temporary fix...but yours appear to be permanent jumpers.
hahah +1 for the Friendly Giant reference at the end!
I have a SuperPET sitting in storage... thinking it's time to pull it out too. Also with it are a PET 2001, and a PET 4096 with the rare purple screen.
Great video Dave, and awesome shout out for my friend Rudy!
Gorgerous machines and great work with them.
kludge
[klo͞oj]
noun
an ill-assorted collection of parts assembled to fulfill a particular purpose. Is that the word you're looking for Dave? Also, I'm guessing the evaporative cooling with alcohol drives the surface temp below the dew point, and the board has to warm to above the dew point to quit condensing water out of the air. Cheers!
It's wierd to see those old machines again. I learnt to progran on the PET 64K.
I use "pure gum turps" to clean the yellowed/dirty plastics. Works a treat and never had any long-term issues.
I love Dave he is just old school technician bad ass
Never trust a programmer with a screwdriver
I genuinely thought you were mugging me off with a DODGE coin joke with “bodge” 😂. I am forever now going to pronounce it your way! Ty!
It's difficult to get ethanol to 100% purity because it wants to loose-bond with water. Alcohol, with water loosely bonded to it, will evaporate a lot faster than just water, when hitting it with compressed air. Ergo, ethanol is a good way to clean up really stubborn water infiltration.
Nice to see the SuperPETs! With 2, you could set up a network with their HOSTCM file server!
I remember working with the PET back in 1979 in high school. They were to be an upgrade from an old IBM systems. Fond memories of cursing while learning to program
2:30 Haha. Reminds me of a customer's (a fire department) IT manager who on a semi-regular basis would gather up all the Wyse 50 keyboards from the stations, completely disassemble them and run them through the HQ's dishwasher. Keys would go in the silverware holders, PC boards and cases fit nicely in the racks like plates. It did work to keep all the diesel dust from accumulating too much.
To reduce the chances of lifting traces when removing a chip: after you’ve desoldered the pins, use a hot air rework station to uniformly heat the board around the pins. The chip should then fall out under its own weight.
Warnings:
1) if it takes more than around 2 minutes, the hot air could warp the PCB.
2) Hot air will melt plastic in the vicinity, so use kapton tape to cover nearby slots and connectors.
Dave, For desoldering, use a dab of flux paste to protect the PCB from unnecessary damage. The flux paste acts as a thermal conductivity medium to spread the heat evenly. 🎉
Done that exact board washing technique MANY times at my first job of phone equipment repair.
My first ever computer was a Commodore PET with a cassette drive in the case.
Will you be running a prime sieve so we all knowhow much faster the Thread Ripper then the Supper Pet?
the super pet has a chance to win, it's super after all!
Pro Tip: If your IPA lists its ABV on the bottle, you're using the wrong IPA.
I defer to your experience but I have never seen a circuit board cleaned that way I will perhaps try it one day. Thank you for the channel
Started with a vic20 Got upgraded to c64 Now 30 years into a ms enginner and virtualization engineer career
"Bod-ge", from an artisan who made beech wood furniture in the woods; Bodger. Likely because every one was unique and just good enough to work.
I don't normally applaud after watching a TY video, but I genuinely did for this one. 👏🏻👏🏻
dave you might consider using distilled water instead of water out of the faucet.
Whoa. I saw a SuperPET at a computer show once but I thought it was something someone had hacked together themselves and pasted the "super" badge on. I didn't know this was a real computer until now XD
Congrats on a job well done!
No 'Hey I'm Dave' at the beginning ??? Its an institution!
I missed even more the "In the meantime and in between times, I hope to see you next time" at the end!
Yes, it is the cooling effect. Causes some condensation. I use this technique on motorcycle parts.
There have been numerous occasions at work where I have been hot air blasting PCBs using the hand dryers in the toilets and people have given me very strange looks. It is a good way to get rid of flux cleaner (especially around pH amplifiers).
My PET 4016 is still working fine. I upgraded it to 32k at some point, its a bit hard to remember when as I must have bought it around 44 years ago 😅😂
Still need to fix the tape player but the single floppy still works fine.
2:28 - I believe it's good practice to remove any socketed IC's before cleaning the board. Or at least, re-seated.
0:44 Made in USA - You don't see that anymore nowadays! 😔
It's amazing how radios, TV's, phone systems, vacuum tubes, transistors, etc.... used to be made in the US.
My grandparents met in a factory assembling boards for transistorized PBX systems while working for ATT.
My grandpa gave me a reject board as a kid and I wanted to make it work, but I was like 8, so I couldn't do anything with it 😂
@@volvo09 I used to design CPUs that were made in the USA. They went into things like car ECUs. Our fab was very big and was also in the US
Nice job Dave!
LOL. It looks like the insides of my Silver Ball pinball machine. Only I did an LED upgrade to the play table.
Nice you got WatBASIC running! Congrats Dave!
Time for the Super PET Prime Drag Race!
These are a number of years older than i am, and i have no connection to them but its fun to watch Dave do stuff and its basic enough i still kind of understand 25% of it.
I have my own local AI now to torture.
I love the PETs and superPETs...
I didn't know you were from Regina, I seem to be running across other Saskatchewan people all over the place this week
The original PET models (after the 2001?) were named with two sets of dual-digit numbers, like 8032 or 4016. The first two numbers "80" or "40" represented the number of on-screen character columns. The second set of numbers (I think up to 32) identified the amount of RAM (in K) shipped with the machine. Thus an 8032 had 80 columns of text and 32K of RAM.
just remind consumers is most PC boards are cleaned in water to clean flux after infrared thermal soldering
My brothers PET was the 1st computer I used
I barely even remember that the SuperPET was a thing. And rinsing a motherboard in WATER(?!?!?!?). Didn't think that was possible. I've learned something!
I know that the lead will slowly oxidize in leader solder, especially if there's stuff like water getting to it. Lead oxide won't melt at any reasonable temperature.
Evaporation experience with IPA may depend on its concentration. Tech tip: IPA in concentrations of 60% to 90% is more effective at killing germs that over 90%. The water breaks down the cell structure.
Great video, thanks! Maybe not so fast next time, more details would be great!
I remember when the PET came out back in 1976. I didn't know they made a Super PET. Where is the disk drive? I didn't see it in the video. It cool you can make these old machines work. The first computer I worked on was an IBM 1401. Not likely to find one of those in some one's garage.
The Friendly Giant: "Look Up. Waaaaay Up."
Had a chicklet PET but never a Super PET. A little envious now.
who doesn't love their pets
Love the Friendly Giant inspired ending. Did you study at Waterloo?
We had a PET at high school, but I never got to use it. I recall it had an odd flat keyboard. Maybe I should try and find one!
The title alone is enough to entice me to watch.
Interesting that you use water on the PCB. I've always use IPA.
"I don't wanna be buried in a PET Cemetary I don't wanna reboot again."
Look waaaaaaaay up… and I’ll call Rust-y.
First computer I ever used back in the late 70s.
its BOD-GE .. bodging is how most of us (at least in Britain) without formal training or any inherent skill perform any repair on anything from electronics to shed roofs ..
Nice. I'm hoping to see you add an OS9 board to them.
Nice video, although I've never worked on (or even seen) a Pet before, I've fixed and restored quite a few old machines. I've never heard "bodge" pronounced any other way than "BAH-j". It can be almost impossible removing parts from these old boards without breaking something, as depending on the manufacture, many of them are super cheaply made. Combine that with ground planes and soldered RF shielding and you can have a real nightmare.
i remember all the PETs at school
What is the criteria for computers getting to join your collection? Prior use, interest, intrigue, rarity, or 'it was a Tuesday'...
they built them so well back then
Major fopaux , your test program should display "HELLO WORLD"
I dearly wish someone would reverse engineer the SuperPET boards for the 8032 so we could buy and solder them up. Wanted one for decades for my system. :)
Dave, you do PETs? Wow, still have my Commodore 64 with the 1541, and a few 5.25" disks, as well as the cassette drive, but haven't tried to power it in years (and yes, I have a couple of CRT's still working). Hope to have some time to tinker with it someday.
Surprising that none of the electrolytic caps needed to be replaced...
pet.. Sematary!
we just called them spaghetti wire, or blue wire, since all the wire we had was blue coated
If mice were living in it. You'd smell it the second you took the top off. There would be no question.
First computer i ever used was a PET.
We called them "blue wires" because, for some reason, they were always blue.
The PET was the first computer I actually used, a 4032, so I located a faulty one and rebuilt it on my channel. It was very nostalgic getting it going but then I don't have much use for them so move on :)
Almost as many keyboard screws as an Atari ST :D
A friend of mine had a SuperPET that he added a external toggle to switch from 80 to 40 column mode. I don't know what he did exactly but I know it's possible.
I really like when you do PET or old computer videos. By the way how is the KIM-1 doing?
What eproms can you make use of here? I have a lot of the 27xx and otp versions too. Need to find good homes for them as for now they sit in boxes in Astro's "The bunny" room.
'Bodge' rhymes with 'dodge'. Bodge means pretty much the same thing as 'kludge', which is the more American expression. Both refer to quick & dirty hacks.
What percent IPA are you using in your drying step? 70% is the moat available, but 99% will likely dry faster.
❤❤❤
That desoldering tool sucks.