Amiga 2000 and the DKB Megachip of Poo
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- Опубліковано 29 січ 2023
- E373: A boxed Amiga 2000 from a former MOS technician arrives for repair. Mr Michael drove for 4 hours, He, his Wife and I Met for lunch, talked for a few hours and then off to be recapped and checked out. a strange hard disk error and a interesting SD card lead down a rabbit hole of Amiga proportions. Buckle up this ones a doozy of weirdness. but i get it sorted in the end.
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I also want to say all should really appreciate the work, time and effort this man puts in for the Amiga community. Thanks Chris!
Great work Chris love seeing a 2000 weird fault sorted.. One my favourite all time Amigas.
I just finished repairing and recapping an almost identical machine. A2000, DKB, PPS Zeus 040/33MHz, and 90s hard drives. I had some strange issues with the hard drives and some graphic corruption. I decided to recap the board because I found 3 capacitors that had corrosion on the top (I am not sure if these caps can leak from the top so I have no idea why). After recapping the board and putting the DKB back the machine was stable. After watching this video about 3 times I think it wasn't the capacitors but the DKB being re-inserted. I also treated the DKB socket with DeoxIT with the Agnus 8375 still in it. Now I have to tear it back down and check the Agnus socket after seeing that blown out POS you replaced. Thanks for the informative video Doc!
I always learn something in your videos. Heck, I might even retain some of it!
Used the clip provided, My 2000's worked fine and still works fine in this configuration nearly 30 years later
Great video Chris =D I LOL'd at the SCSI problems, been there - got that T-Shirt! It's really painful and time consuming when SCSI stuff goes crazy on Amigas =/ I too now prefer to do all my setups in WinUAE!
Funniest Amiga man on da net.
Odd. I own two Megachips and have always loved them. Never had an issue related to them either in my Toaster /A2000 or my Vampire A500 in a checkmate case.
Got me thinking about my DKB chip, probably had been the cause of some issues, gonna have to take a look now.
My favorite part was the part he couldn’t get the right word out then clip to the “pres”.. nice
Chris,
Motherboard only has Shield in America.
great Video and I am glad I got a proper 2meg dealer installed upgrade. No Mega Chip for Agnus
Love your work as always
im not talking RF shield im talking the lower sheild and plastics to protect your motherboard from hitting the metal case
@@ChrisEdwardsRestoration I was referring to the shield under the mobo. This was partly how I first learned of your website. You were telling a guy from Australia to be sure to put that shielding back on his A2000. I replied back to you and let you know that none of our Amiga 2000's had the shielding or the plastic insulating sheet. Do you remember that Chris? I have since learned that it only seems to be America that has it as I bought an extra A2000 from Germany some years ago and it had no shielding either. Mind you that may be because the 3 I have are 1 x rev 6.0 and 2 x rev 6.2. They seem to be like regular PC mobos with metal around the screw points for the motherboard.
I addition to my comments about changing the bios setting I found this from The Big Book of Amiga Hardware:
A full length Zorro II card which emulates an 8088 based PC. The card plugs into both a Zorro slot and an ISA slot and allows you to use real 8bit ISA cards. This card may have been supplied with a 360K 5.25" floppy drive however the card can also use a real external Amiga floppy drive, to read 720K DOS disks.
And this from the Amiga Hardware Database:
Company
Commodore, USA
Date
1990
Amiga
A2000, A3000, A4000
Interface
Zorro II, ISA
IBM XT emulation
NEC V20 @ 4.77 / 7.15 / 9.54 MHz (PLCC)
the different clock speeds are switchable by software (Ctrl-S, Ctrl-T, Ctrl-D)
640 kB RAM
16 kB XT compatible BIOS
no floppy drive supplied - it uses the built in 3.5" Amiga disk drive
the drive can either shared between the Amiga and PC, either assigned exclusively to one of them
can use any other Amiga floppy drives too: internal or external, DD or HD, 3.5" or 5.25"
parallel interface and mouse are emulated by the Amiga
piezo beeper.
So it seems both these sources state that an Amiga 880k drive can be used to read and write 720k pc disks.
Here is a link to the 8088 Bridgeboard User Guide: www.retro-commodore.eu/amiga-hardware/2/
Nice job!
Great entertaining and educational video. Loved it.
Always entertaining thanks chris.
I had a C64 in the 1980s and really, really wanted to get an Amiga - but couldn't afford it. Then I strongly looked into getting a 520ST, then a 1040ST, and then realized I couldn't afford that either! (Plus I couldn't make up my mind which system I wasn't able to afford, I guess "all of them"?) So I gave up the whole business and did engineering in college for the next several years. No PCs, didn't even play Nintendo or nuthen.
Today I've got the Pi-400 with PiMiga 3.0 installed (128 GB card), and I literally don't know what I'm doing. I never had an Amiga! All my buddies had 'em but apart from trying out Lemmings this one time, that's as much as I knew about it (and I didn't understand the Lemmings game, in fact, I still don't really get it.)
In 1994 I got an internship job at a government agency and got to play with Mac SE/30 and Mosaic browser and all that cool stuff (cool games like Spaceward Ho! and Bolo
I remember using Amiga 2000s that had 1.3 but then softkicked 2.0 ROMs. It used a soft kick program from aminet, I don't recall which one. Check the 1.3 start up sequence.
i had issues with my dkb on my 2000 untill i added a pin header to the via on the addiress line 20 between gary and the cpu then added a jump wire cable to the dkb and not used the included, wire clip
Nice😀
you said its got a GVP 030 card? interesting that on the Amiga hardware Database it says the DKB "rules out internal processor cards and internal memory expansions with more than 512 kB RAM"
Watched again for 100th time :)
Hmmm.....I've never heard of the DKB MegaChip being unreliable. Is that a reference to the manner in which it is installed (socket plug)? I believe it was the original 2MB chip RAM upgrade for the A2000 that set the standard for all others.
just this dkb itself . It has had more insertions than a Kardashian.
Chris,
Can't you access the BIOS pn the PC Bridge Card and change the floppy drive type to a 3.5" 720k?
I know the 286 does because I have one but I suppose the 2088 may not. Just a thought.
on the 286/386 you can on this 8088 it doesnt have anything like that. i know the 386 card i just reviewed you could use the amiga 880k on the bridgeboards external port and it would act as a 720k pc disk, this ones looking for a 360K 5.25
I JUST tried switching on my trusty old A2000 last weekend, toaster and all. The 1084 monitor worked... found all the right cables and - poof. One half second of a power light then nuthin. Still wondering if it's worth fixing but I sure wish I knew what was on that hard drive.
theres s fuse inside the power supply that prob pooped out
@@ChrisEdwardsRestoration Thanks a bunch for the info. I removed all the expansion boards last night (except the A2091 SCSI), like the ALive! video board, the Emplant mac emulator and the Toaster 4000, then tried again. This time it ALMOST powered up, but after about 3 seconds there was a SNAP and then a puff of smoke from the back... Didn't smell good so I turned everything off. Think I'll have to find a local tech, if there is one... Sigh.
@@timboland4359 amigakit sells ATX converter cables for 15$ , you can use a normal ATX power supply with them. (add the button) here www.amigakit.com/a2000-power-adapter-cable-amiga-2000-p-998.html?aksid=5be1cbt36add9ani5iqsg50jmv¤cy=USD&aksid=5be1cbt36add9ani5iqsg50jmv¤cy=USD&aksid=5be1cbt36add9ani5iqsg50jmv
@@ChrisEdwardsRestoration Awesome - thanks so much for the reply and the link. Greatly appreciated. At the risk of taking advantage of your hospitality, do you have any tips on what I should look for inside my A2000 after the 'puff of smoke'? Is there a likely component on the mobo or in the power supply that I should examine? I guess it probably doesn't matter since I'm not qualified to fix it in any event... Just wondered if I should check for any 'well known' faults on this old machine. BUT if you're too busy to reply, NO WORRIES. You've already been more than helpful. THANKS.
The problem might be that the unit keeps switching Kickstarts uncontrollaby, probably a defective rom switcher.
did you watch it? theres no rom switcher, there was one in the original packing box but it was never installed.
@@ChrisEdwardsRestoration I saw a machine that looked like it was switching between Kickstarts but I may have misinterpeted the color changes.
2:39 hello what does it mean by poo it says poo in the video title ??
Poo meaning crap meaning it has issues
tuthi hai
No fan replacement in the power supply?
Was not asked to replace it.
You must have blown it out with compressed air at least? It seems to me the noisy fan became no longer an issue after awhile?
@@Grunchy005 haha no never touched it. probably warmed the dust up into lube
mega chip of poo what’s this mean ??
poo= crap, turds, junk, bad