Michael Wessel
Michael Wessel
  • 315
  • 138 314
This TRS-80 Model III is a Polyphonic, Multitimbral MIDI Synthesizer
Another update from the MIDI/80 Sound & Interface Card Project for the TRS-80 Model 1, III, and 4 - this time demonstrating a new piece of software that George Phillips (author of trs80gp and the Zmac assembler for the TRS-80) and I wrote over the last couple of weeks.
Переглядів: 581

Відео

MIDI/80 on the TRS-80 Model III - Some Demo Songs
Переглядів 62День тому
The good news is: with the exception of "Karn Evil 9" from ELP at the beginning, all the other demonstrated songs fit into memory! The ELP song is also problematic from a MIDI timing / MIDI data density point of view. I really like that Bach's Toccata & Fugue in D minor (BWV 565) barely fits completely - just a few bytes left! I didn't fully play it in the video. I also think that CANYON.MID (l...
MIDI/80 Drum Tracker Update - Version 1.2
Переглядів 94День тому
Real-time tracking and quantization (to the current editor grid resolution) is working now.
Debugging Rafa's MPF-1B Printer - this time, no repair is needed!
Переглядів 1302 дні тому
Mystery Solution at 10 mins - a PSU with insufficient current (less than 1A?) causes the printer to malfunction. Diagnosis: get a proper power supply!
MIDI/80 for the TRS-80 - Drum Tracker & Sequencer - Status Update
Переглядів 24414 днів тому
Progress report. Still quite a bit of work left... loading, saving, better editing, real time tracking, MIDI in, ... but we are getting there. Slowly but surely! Zmac and trs80gp rock! Great development environment. Thanks to George Phillips for making such awesome tools!
MIDI/80 on the Model III - Realtime Recording of Very Complex MIDI Data
Переглядів 263Місяць тому
So far I tried to avoid pulling wait states - however, this has the benefit of allowing me to record complex MIDI data now without glitches. Check it out, Eddie would approve!
MIDI/80 - MIDI Realtime Recording Test with the Model III
Переглядів 128Місяць тому
For some reason, IO bandwidth is a bit slower on the Model III. Note sure what the reason is. I currently still cannot record very complex MIDI songs such as CANYON.MID in realtime (see Model 1 recording test!) without a lot of glitches on the Model III. Less complex / dense MIDI such as Bach is working fine though, as demonstrated in this video. Well, maybe we'll have to live with that - eithe...
MIDI/80 for the TRS-80 Model III - First PCB Test
Переглядів 202Місяць тому
Mostly working - still needs some firmware tweaks.
Lissajous ASMR Oscilloscope Fun
Переглядів 184Місяць тому
I learned about Lissajous figures from my high-school Physics teacher, Herr Schneider, in about 1987 - in the last Physics class before the Xmas break, he would usually indulge us with some fun experiments, putting some of the more fancy equipment from the lab to work! Frequently, it involved (him) smoking, and the argon laser - and on one occasion he demonstrated Lissajous with the then purely...
MIDI/80 Update #6 - Realtime Recording and Playback of Complex MIDI Data
Переглядів 332Місяць тому
I have a first version of a simple MIDI recorder / playback program now. No quantization or any fancy stuff yet - this is a proof of concept that MIDI/80 is capable enough to support realtime recording and playback of complex MIDI data stream, as required for a MIDI tracker or sequencer. Seems we are on the right track! Playback is still a bit too slow. Should be straightforward to fix.
TRS-80 Model 1 and Roland MT-32 via MIDI/80 - Playback Test over MIDI DIN OUT Socket - Update #5
Переглядів 115Місяць тому
This is a nice MT-32 MIDI song (not quite General MIDI yet) - from the game Apogee AFAIK. Note that you can just directly connect any MIDI expander such as the Roland MT-32 (Roland Sound Canvas, ...) directly to MIDI/80's MIDI DIN OUT socket. You do NOT need a Waveblaster sound module such as the S2 or X2GS if you already own a capable multi-timbral (GM) MIDI sound module or synth.
Addendum to MIDI/80 Update #4 - Test of MIDI DIN OUT Capability #septandy
Переглядів 104Місяць тому
... let's see if the MIDI DIN OUT socket also works, and if the Microkorg can play along with the S2! #septandy
Playback of Complex MIDI Songs with MIDI/80 on the TRS-80 Model 1 - Update #4 - #septandy 2024
Переглядів 177Місяць тому
I reached another engineering milestone with this project - first successful playback of complex GM MIDI songs. The current song format that I am using is not space optimized - hence, some songs only fit partially into the limited 48 KBs of the Model 1. I used the Zmac assembler from George Phillips for these demos - www.48k.ca/zmac.html. Great assembler, I can highly recommend it! And thanks t...
MIDI/80 for the TRS-80 Model 1 - Update #3 - #septandy
Переглядів 148Місяць тому
Update #3 I encountered serious difficulties in realizing Z80 IOREAD requests with the previous "Bluepill address decoder only" (1 chip) design. Given the limited number of 5V-tolerant GPIOs on the Bluepill, I need to change the direction of the databus GPIOs on the Bluepill from INPUT to OUTPUT and back to INPUT within a single Z80 IOREQ READ transaction. Looking at this on the scope, I determ...
Update from the MIDI/80 Project for the TRS-80 Model 1! #septandy
Переглядів 230Місяць тому
Drums demo and project status report! #septandy 2024
Connection Machine CM2 in the Computer Museum of America in Roswell / Atlanta
Переглядів 722 місяці тому
Connection Machine CM2 in the Computer Museum of America in Roswell / Atlanta
#SepTandy - Something new is coming for the TRS-80...
Переглядів 1972 місяці тому
#SepTandy - Something new is coming for the TRS-80...
TRS-80 Model 100 - No-Boot Issue (4) - New Socket, New Life? #septandy
Переглядів 1162 місяці тому
TRS-80 Model 100 - No-Boot Issue (4) - New Socket, New Life? #septandy
TRS-80 Model 100 - No-Boot Issue (3) - Removing the CPU Socket #septandy
Переглядів 1192 місяці тому
TRS-80 Model 100 - No-Boot Issue (3) - Removing the CPU Socket #septandy
TRS-80 Model 100 - No-Boot Issue (2) - A Bad CPU Socket? #septandy
Переглядів 672 місяці тому
TRS-80 Model 100 - No-Boot Issue (2) - A Bad CPU Socket? #septandy
TRS-80 Model 100 - No-Boot Issue (1) #septandy
Переглядів 942 місяці тому
TRS-80 Model 100 - No-Boot Issue (1) #septandy
The Sharp Pocket Computer Experience - Cassette Loading, Printer, Biorhythm, BASIC!
Переглядів 1432 місяці тому
The Sharp Pocket Computer Experience - Cassette Loading, Printer, Biorhythm, BASIC!
Magnavox Odyssey II / Philips G7000 with BackBit Pro and The Voice Games!
Переглядів 1432 місяці тому
Magnavox Odyssey II / Philips G7000 with BackBit Pro and The Voice Games!
TRS-80 Model 100 - Barcode Reader Quick Demo
Переглядів 7283 місяці тому
TRS-80 Model 100 - Barcode Reader Quick Demo
Triumph Adler / Royal Alphatronic PC - Full Demo
Переглядів 1753 місяці тому
Triumph Adler / Royal Alphatronic PC - Full Demo
Quick Demo of the Tandy Portable Disk Drive (TPDD 1) with the NEC PC-8201a
Переглядів 2613 місяці тому
Quick Demo of the Tandy Portable Disk Drive (TPDD 1) with the NEC PC-8201a
TRS-80 Model 100 REX CPM & TRS-80 Model 4 FastTerm II - CP/M Terminal Emulation via RS-232 Cable
Переглядів 2543 місяці тому
TRS-80 Model 100 REX CPM & TRS-80 Model 4 FastTerm II - CP/M Terminal Emulation via RS-232 Cable
How to run Turbo Pascal on the TRS-80 Model 100 - REXCPM and the NSC800 Mod
Переглядів 6423 місяці тому
How to run Turbo Pascal on the TRS-80 Model 100 - REXCPM and the NSC800 Mod
TRS-80 Model 100 & NEC PC-8201a: REX Update & Reinstallation
Переглядів 3593 місяці тому
TRS-80 Model 100 & NEC PC-8201a: REX Update & Reinstallation
The Classroom Microtronic - Using a TIL 393-6 Adapter
Переглядів 2534 місяці тому
The Classroom Microtronic - Using a TIL 393-6 Adapter

КОМЕНТАРІ

  • @dighawaii1
    @dighawaii1 3 дні тому

    Very cool! Fond memories of low baud rate modems and BBS systems :) This is great. You can write the next pop hit on a trs-80 😆😆

  • @AndrewAHayes
    @AndrewAHayes 3 дні тому

    There are so many cool upgrades for old 8 bit computers developed by enthusiasts, I would have loved this back in the day, I did have a MIDI interface for my Commodore 64 though

  • @BitwiseMobile
    @BitwiseMobile 3 дні тому

    Oh geez - the first computer I used on a daily basis was a Trash 80 model III. This was 1985 and there were no computer classes in high school, so I needed to take an extension course. I had already taught myself assembler, but I wanted to learn C. In order to get into that class though you had to take a data entry class first (this was the infancy of personal computing). We used Trash 80s and a program called VisiCalc, plus a word processor I don't recall the name of. Incidentally Lotus 1-2-3 - which if you were an accountant in the 80s and 90s you will know this program - was based on VisiCalc. I went on to take that C class finally and I aced it. We used mainframes for that class and I had to submit my program as a job, wait for it to run, and get the print out for my grade. Two different worlds for sure :)

    • @BitwiseMobile
      @BitwiseMobile 3 дні тому

      Incidentally the first computer I ever coded on was a TRS-80 Model 100. My uncle who was a professor at LBSU and UCR was writing a program with one of his graduate students to help ESL students learn the language better. He brought the computer and a print out of the program to our house one weekend when he was visiting. I was intrigued and when he started showing me the BASIC printouts something inside me clicked. I was 13 or 14 at the time I think, and I basically made it impossible for him to get any work done. I begged him to use that computer all weekend long and I taught myself BASIC. That was the first computer I ever touched, and the first computer I ever programmed.

    • @michaelwessel4953
      @michaelwessel4953 3 дні тому

      @@BitwiseMobile things have changed a lot since then, yes. I remember Lotus 1-2-3, but didn't get a PC before 1993. Before that, an Amiga 500 (1987), preceded by the Amstrad CPC 464 (1985). My first computer I got in 1983, a Busch 2090 Microtronic. A 4bit CPU trainer, basically. Machine code and hex 7segment display. Around that time, 1984, before getting the CPC 464, I took an afterschool class in the community center. The teacher was a GI and had brought his own 4 Model IIIs for us to use. We learned BASIC. Since then, I have a soft spot for the Model III, even though I didn't own one until September this year. Thanks for sharing your memories here! Cheers

  • @ericBcreator
    @ericBcreator 3 дні тому

    Pretty cool! My dad used the TRS-80 III in the mid to late 80s to calculate and print tournaments of homing pigeon races ;-) I learned coding on it before switching to MSX(2) and PC's.

    • @michaelwessel4953
      @michaelwessel4953 3 дні тому

      Pigeon races - now that's what I call a unique use case! Thanks for sharing! 🐦

  • @MeinElektronikHobby
    @MeinElektronikHobby 5 днів тому

    ... da sieht man wieder, wie effektiv eine gute Zusammenarbeit ist. Ist schon zu einem super Ergebnis geworden.

    • @michaelwessel4953
      @michaelwessel4953 5 днів тому

      So ist es! I am standing on the shoulder of (a) giant(s), as we say here 🙂

  • @KalterKrieger
    @KalterKrieger 6 днів тому

    Oh Gott, an die Zeiten erinnere ich mich auch noch. Am Strand Z8o Programme geschrieben und in Hex Code umgerechnet und dann alles eingestippt. Und wehe man musste Sprungbefehle umrechnen weil man Code eoinfügen musste... was ein Komfort heute ist doch derr Arm Cortext mit Source Level Debugger und JTAG. Trotzdem neulich einen Z80 erworben, der die ganze Peripherie mit einem AVR emuliert mit einer Floppy dran.

  • @MeinElektronikHobby
    @MeinElektronikHobby 7 днів тому

    ... es geht weiter, aber sind die Songs nicht ein bisschen schwach auf der Brust, oder liegt das an der Aufnahme. Die Midi Songs beim Amstrad waren doch um einiges besser, oder?

    • @michaelwessel4953
      @michaelwessel4953 7 днів тому

      Sehe ich nicht so. Die gleichen Daten, die gleiche Soundcard... aber bessere Aufnahme wahrscheinlich. Und mehr Speicher!

  • @mUbase
    @mUbase 7 днів тому

    cor mate what an invollved process !! Laborious would be an understatement. lol. I have a Microprofessor which I ove, especially for writing programs for hardware. :) nice demo, thanks x

  • @MeinElektronikHobby
    @MeinElektronikHobby 9 днів тому

    ... interessanter Programmiervorgang, ich bin begeistert. Sind das dann 12 "Instrumente" ?

  • @thishandleisalreadytaken66
    @thishandleisalreadytaken66 9 днів тому

    Could this have midi start/stop sync too or is that asking too much from something which is already amazing.

    • @michaelwessel4953
      @michaelwessel4953 9 днів тому

      @thishandleisalreadytaken66 MIDI input is on the todo list. Sync will be supported eventually. Slowly but surely.

  • @DavidMorley
    @DavidMorley 9 днів тому

    👌🤟 excellent work!

  • @sma7530
    @sma7530 11 днів тому

    Hi and a great demo. But what is the name of the SID tune at 7:01 that you are playing ?

  • @MeinElektronikHobby
    @MeinElektronikHobby 13 днів тому

    ... danke für das interessante Video und die wichtige Stärke eines NTs. Da kommt aber auch wieder die Begierde nach einem Printer hoch. Bei weiterem Nachdenken frage ich mich aber, ob ich in meinem Alter wirklich noch so ein Ding brauche. Viel benutzen würde ich es wahrscheinlich nicht mehr, aber wenn ich es nachbauen könnte, würde ich es machen. Fehlt aber das Druckteil. Bei Ali Express wohl vorhanden, wird aber nicht nach Deutschland verschickt.. Danke für Deine Arbeit.

    • @michaelwessel4953
      @michaelwessel4953 12 днів тому

      Das Druckteil kannst Du von einem Sharp CE-125 nehmen! Die sind identisch. Tatsächlich musste ich das Druckwerk für Rafa's Drucker austauschen. Ich hatte seinen Drucker schon einmal, im Sommer, ihn dann repariert, zurückgeschickt - und dann kam er zurück weil er sagte, er funktioniert bei ihm nicht. Daher dieses Folgevideo. Gut, dass es diesesmal nur das Netzteil war. Ich hatte zuvor 2 Wochen gebraucht, um das Ding zu reparieren - alle Chips wurden gesockelt, ausgetauscht, und dann auch noch das Druckwerk kaputt :D Die Platine brauchte zudem ein paar Bodgewires. War ne ziemliche Arbeit, dass Ding wieder flott zu kriegen.

    • @MeinElektronikHobby
      @MeinElektronikHobby 12 днів тому

      @@michaelwessel4953 einen Sharp CE-125 habe ich schon für 40€ gekauft. Ich schau' es mir mal an. wenn es da ist. Danke für den Hinweis.

    • @michaelwessel4953
      @michaelwessel4953 11 днів тому

      @@MeinElektronikHobby es gibt 2 Schaltpläne für den Drucker - die korrekte Version des Schaltplans ist im MPF- 1 PLUS Drucker-Handbuch angegeben! Die funktioniert auch mit dem MPF-1(B) (nur anderes EPROM). Wie im Video.

    • @MeinElektronikHobby
      @MeinElektronikHobby 11 днів тому

      @@michaelwessel4953 gut zu wissen, ixh pack die gleich mal in mein Archiv.

  • @DavidMorley
    @DavidMorley 13 днів тому

    Brilliant!

  • @jtjacques
    @jtjacques 15 днів тому

    Amazing work!

  • @MeinElektronikHobby
    @MeinElektronikHobby 15 днів тому

    ... erinnert mich an meine Zeiten, als ich die Elektro Drumbox bauen wollte. Hat aber nie so richtig funktioniert. Bei dir aieht es aber schon ganz gut aus.

    • @michaelwessel4953
      @michaelwessel4953 15 днів тому

      Na Du brauchst eben ein TRS-80, dann klappt es auch mit der Elektro Drumbox 😉

    • @MeinElektronikHobby
      @MeinElektronikHobby 15 днів тому

      @@michaelwessel4953 400 € für einen TRS-80 Modell II bei Kleinanzeigen. Ist mir zu teuer. Und das war eine ELEKTOR Drumbox . 🤓

    • @michaelwessel4953
      @michaelwessel4953 14 днів тому

      @@MeinElektronikHobby Model 2? Ja klar, die sind teuer! Weil selten! Model 3, diskless, wie meines hier.

  • @thishandleisalreadytaken66
    @thishandleisalreadytaken66 15 днів тому

    AMAZING

  • @fgaviator
    @fgaviator 16 днів тому

    Nice! :) I had a whole collection of the Philips electronics lab series. My parents got a good deal when the series was discontinued and a local shop was clearing his remaining stock. But I never had this one. I remember reading all about it in the catalog and studying the photos. Finally, almost 40 years after dreaming about it, I finally see it in action :). (I probably haven't missed much though, since I ended up with more than enough other computers in my life, and was soon building my own expansion cards for Apple II and PCs). Looking at the entire series today, and also at this one (found the German manual available online): amazing to see how complex these were. These were really serious electronic training sets - well suitable for a school or adult professional training environment. Manuals and especially the circuit descriptions were very demanding. It's pretty clear why, in terms of sales, they couldn't stand a chance against the competition, which was offering simpler, more toy-like sets, more suitable for the "mass market". More "kids friendly". Which is a pitty, as there also was a place for these more ambitious learning sets.

  • @ace942
    @ace942 26 днів тому

    My first computer was an Atari 800XL. Always liked the feel of the keyboard. How are programs saved on your system by the way?

    • @michaelwessel4953
      @michaelwessel4953 26 днів тому

      Oh, I have almost all major original and modern storage solutions. From 810 and 1050 with Bitwriter Replica, SIO2SD, Incognito, ..., some of the flash cartridge solutions, ... SDrive, ... :-)

  • @retroguy4322
    @retroguy4322 Місяць тому

    Mega! My all time favorite song! I love the sound of the 80ties :)

  • @MeinElektronikHobby
    @MeinElektronikHobby Місяць тому

    ... wird immer besser!

  • @chasefive5
    @chasefive5 Місяць тому

    very cool

  • @MeinElektronikHobby
    @MeinElektronikHobby Місяць тому

    ... hurra, der alte bach spielt auf einem alten TRS-80

  • @JamiesHackShack
    @JamiesHackShack Місяць тому

    Neato!

  • @MeinElektronikHobby
    @MeinElektronikHobby Місяць тому

    ... klingt gut. Was ist das für eine Karte rechts von der Midi Karte?

  • @TJBChris
    @TJBChris Місяць тому

    I was today-years-old when I first jammed to a TRS-80 Model III’s music.

  • @MeinElektronikHobby
    @MeinElektronikHobby Місяць тому

    ... herumspielen mit Lisajousschen Figuren war eine der Lieblingsbeschäftigungen mit meinem Voltcraft (Conrad) Oszi. Der steht heute immer noch in meiner Werkstatt. Danka für die Erinnerung an interessante Zeiten

  • @jtjacques
    @jtjacques Місяць тому

    Very neat! I might have to try this myself.

  • @MrWaalkman
    @MrWaalkman Місяць тому

    Nice. But can you play Doom on it?

  • @MeinElektronikHobby
    @MeinElektronikHobby Місяць тому

    ... ein Emoll Akkord am Anfang, oder? Wieder schöne Beispiele zur Arbeit mit MIDI Geräten.

  • @MeinElektronikHobby
    @MeinElektronikHobby Місяць тому

    ... eine vielseitige MIDI Karte. Kann man ähnliches auch mit der Blue Pill Karte für den Amstrad machen, einen Midi Expander anhängen?

  • @thishandleisalreadytaken66
    @thishandleisalreadytaken66 Місяць тому

    Great work Michael!

  • @stuc8446
    @stuc8446 Місяць тому

    Hi I have an MPF-1 but no experience in getting PCBs made up. Would you be able to provide a PCB and/or full kit of parts please?

    • @michaelwessel4953
      @michaelwessel4953 Місяць тому

      I would, be unfortunately I am currently out of PCBs and parts... btw, it's super easy to order Gerbers! Just go to JLCPCB.com and hit the upload button. Gerbers are on the Github: github.com/lambdamikel/picoram6116/blob/main/gerbers/PicoRAM6116-Gerbers.zip If you still don't want to try making your own, I can help, but given that I have to order parts as well (-> shipping costs) plus approx. 30 USD shipping from California, it's going to be a bit more pricey (say, 70 USD, that would include shipping). If you are not comfortable soldering, that's another good reason of course. Else, it's really quite straight-forward to assemble. Happy to help either way, LMK,

    • @stuc8446
      @stuc8446 Місяць тому

      @@michaelwessel4953 thanks for your quick reply. TBH - I’d be fine for you to supply a built unit. Not clear if you can send me PM for us to firm up next steps but look forward to hearing back soon.

  • @retroguy4322
    @retroguy4322 Місяць тому

    Great progress of the project ;)

    • @michaelwessel4953
      @michaelwessel4953 Місяць тому

      ... I think I should have an M3 / 4 version available as well soon :-)

  • @thishandleisalreadytaken66
    @thishandleisalreadytaken66 Місяць тому

    Hi there. Will there be a way to actually sequence music with a TRS 80? I’ve been waiting to do this somehow ever since I got one!

    • @michaelwessel4953
      @michaelwessel4953 Місяць тому

      Absolutely! I have a simple MIDI IN / MIDI OUT & S2 MIDI playback recorder - just the raw data. I've been thinking about making a MIDI Tracker. Basically, like Sound Tracker, 4 to 16 Tracks, but for MIDI. Input is either via MIDI DIN, or from the keyboard. Playback via MIDI OUT and S2. It'll take a while to develop this software, but I am highly motivated. After all, implementing a simple MIDI tracker isn't that difficult at all.

    • @thishandleisalreadytaken66
      @thishandleisalreadytaken66 Місяць тому

      @@michaelwessel4953 WOW. This is incredible. I’m not a programmer but would gladly buy something like this for my model 3. How do I stay in the loop on this? Is there a mailing list? Thanks!

    • @michaelwessel4953
      @michaelwessel4953 Місяць тому

      @thishandleisalreadytaken66 thanks for your interest and kind words! I'll keep posting video updates on this channel. The M3 version will be out in 2 months or so.

    • @thishandleisalreadytaken66
      @thishandleisalreadytaken66 Місяць тому

      @@michaelwessel4953 That’s amazing! I’ve subscribed and look forward to updates. Keep up the great work Michael!

  • @MeinElektronikHobby
    @MeinElektronikHobby Місяць тому

    👍

  • @cathrynm
    @cathrynm Місяць тому

    Rocking out to the TRS-80.

    • @michaelwessel4953
      @michaelwessel4953 Місяць тому

      @@cathrynm yepp, that's it - the true sound of the 80s!

  • @1BitFeverDreams
    @1BitFeverDreams Місяць тому

    very cool stuff! I've been developping my own code in C for the Mac Plus to do playback of MIDI on these compact macs. It's not anything that's new to people familiar with Cubase and the like for those machines, but to my knowledge, there's no C programming API out there to let you do MIDI playback as part of your larger program you'd code, such as in a game title screen (which is my goal!). Space Quest III running in black and white had code to make use of the Roland MT-32 through standard MIDI commands, but ofc, never released a public API for programmers. I intend to rectify this!

  • @MeinElektronikHobby
    @MeinElektronikHobby Місяць тому

    ... danke für das Video. Immer spannden die Arbeit zu verfolgen und bald hast du auch die 1000 Abos, wir sind ja schon bei fast 800.

    • @michaelwessel4953
      @michaelwessel4953 Місяць тому

      Dankeschön, ich freue mich auch immer und über Deine Videos! Na, irgendwie sind das gefühlt immer weniger Views und immer weniger Likes. Wenn ich mir die Kurven so ansehen (Views), dann ist auch ganz klar, dass UA-cam "algorithmisch diskriminiert". Was die Kriterien für den Algorithmus sind, weiß ich nicht. Ich werde nächstes Jahr deutlich weniger auf YT machen - ich habe da viel zu viel Zeit investiert dieses Jahr. Ich werde meine Projekte eher nur noch auf Github stellen, das ist etwas "ruhiger" und "weniger aufgeregt". Hackaday bringt auch immer weniger Spaß...

  • @retroguy4322
    @retroguy4322 Місяць тому

    Great project! I'm very excited to see the end result.

  • @MeinElektronikHobby
    @MeinElektronikHobby Місяць тому

    ... und wie ich dich kenne, wird das auch wieder ein klasse Projekt. Weiter so!

  • @RISCGames
    @RISCGames 2 місяці тому

    oh that's beautiful.... my heart!

  • @autingo6583
    @autingo6583 2 місяці тому

    very cool. rewatched terminator 2 a few weeks ago and did some research upon the cm recently, instigated by the cubes lying around on miles dyson's desk at his home.

  • @MeinElektronikHobby
    @MeinElektronikHobby 2 місяці тому

    ... ich habe mal bei WIKI nachgeschaut, was das eigentlich für ein Computer ist. Faszinieren. Danke für die kleine Vorstellung.

  •  2 місяці тому

    I wish their LED animation was less random, but it still looks so cool. Also love the data vault! ❤

    • @michaelwessel4953
      @michaelwessel4953 2 місяці тому

      Yeah I guess the utility bill would make running the real machine a bit prohibitive - btw, they also had the Cray 1A from the DKRZ in Hamburg there! Imagine my surprise when one Hamburger met the other 😀

  • @MeinElektronikHobby
    @MeinElektronikHobby 2 місяці тому

    ... sieht aus wie eine MIDI Karte - Super

  • @Brian_Of_Melbourne
    @Brian_Of_Melbourne 2 місяці тому

    Is there a schematic for your extra board? You talk a lot about the original circuit and how it works, but nothing about the add-on. The problem, such as it is, with the 75491 chips is the resistors between the four C pins (that's C for collector, these aren't enables) and Vcc. That's R5 in the case of U12 and the unlabelled resistor in the case of U15. These resistors, along with the unlabelled 10 Ohm resistors feeding the four C pins are what's limiting the current to the LED segments Reduce these for your blue LEDs and it will work. You say that there's only 2.3 Volts (I think) on the LED anodes, so what's the voltage on the C pins?

    • @michaelwessel4953
      @michaelwessel4953 2 місяці тому

      It has nothing to do with the resistors. Even if you replace these with 0 Ohm networks, these chips aren't able to drive blue LEDs. I tried - that's why I put in a socket for the resistor network in the first place ;) I tried this first thing (and I think I also mentioned that in the video?) - don't you think I would have done this first thing before designing an "active" PCB with the 74LS244? ;-) So no, just playing with the resistor values doesn't do it.

    • @michaelwessel4953
      @michaelwessel4953 2 місяці тому

      PS "Schematics" and Gerbers are here (well, I didn't put a lot of effort in the schematics, but it gives an idea). hackaday.io/project/183618-exploring-the-microprofessor/log/229422-the-worlds-first-mpf-1-with-a-blue-led-display

    • @michaelwessel4953
      @michaelwessel4953 2 місяці тому

      PS2 The resistor array I currently have installed is actually a 0 Ohms one! You can see from the video that this doesn't do it.

    • @Brian_Of_Melbourne
      @Brian_Of_Melbourne 2 місяці тому

      @@michaelwessel4953 Sorry, I'm not following. Your resistor network (RN1 on your schematic) is on the pull down (emitter) side of the 75491 output transistors. I was talking about the pull up (collector) resistors on the original PCB.

    • @michaelwessel4953
      @michaelwessel4953 2 місяці тому

      @Brian_Of_Melbourne forum.classic-computing.de/forum/index.php?thread/32631-bastelhilfe-gesucht-blaue-7segment-anzeigen-im-microprofessor-mpf-1/ Know that R5 is 0 Ohms already in the original design and on the board, forum.classic-computing.de/forum/index.php?thread/32631-bastelhilfe-gesucht-blaue-7segment-anzeigen-im-microprofessor-mpf-1/ and that I replaced RA4 with a 0 Ohm network as well. To no avail. So I think what you are suggesting doesn't work, and that's why I had to add the 24LS244 as an LED driver. No matter how you tune the resistors, the original circuit is not able to bring the voltages above 2.3 V or so. Insufficient for blue LEDs..

  • @mycosys
    @mycosys 2 місяці тому

    Thats an awesome little render. since you seem to be the only one on YT that knows about the DRAW command, can i suggest a video of how much faster it is to use Locomotive DRAW vs calculating in basic loops and using PLOT?

  • @MattFixesStuff
    @MattFixesStuff 2 місяці тому

    Nice retro asmr :D. I got one of those too. Considering fixing it or just selling. Battery is very very dead and leaky and some belts from the casette player seem loose. The rest seems working though and I wrote some basic programmes. Really fun.

    • @michaelwessel4953
      @michaelwessel4953 2 місяці тому

      @MattFixesStuff yeah please remove the battery and replace the belt. The CE-125 will thank you with many more years of service.

    • @MattFixesStuff
      @MattFixesStuff 2 місяці тому

      @@michaelwessel4953 Hey I took out the battery and replaced the belt. Only the main belt though. it seems to run normal now. But I still cant read from the tape (stuck at "busy"). Just writing seems to work. Not sure if the tape is dead or the "read head". I'm just gonna sell it anyways. But its a really fun device. I wrote some basic programmes and they exexcuted fine. If I was born 20 years earlier I could see myself having a blast with that as a kid :D

    • @michaelwessel4953
      @michaelwessel4953 2 місяці тому

      @@MattFixesStuff they are neat little machines! Of limited utility these days, but back in the day, they were magic. I never had one as a kid, but a friend of mine had a Sharp PC-1500. I now have a rather large collection of Sharp pocket computers, including the CE-1500(a). Hmm, yeah, fixing them can be challenging... well, maybe get yourself a broken CE-125 from eBay and get a new tape recorder and/or mainboard from there. That's what I do... most of them are "untested", and if you are lucky, you can get one for as cheap as 35 $ or so. Good luck!

    • @MattFixesStuff
      @MattFixesStuff 2 місяці тому

      @@michaelwessel4953 Yeah I would just try another cassette and changing the read head. But I have 7 nintendo switches that I need to fix curretnly. So I'll just sell this to someone who will treat it nicely. Its in very good condition and i'm glad I got to play with it :) Still a sweet calculator for flea markets or something though :D. You could write like a little programme to make invoices for example. It's just so cool. maybe i'll sleep over it before I sell it.

  • @Black_DeathKnight
    @Black_DeathKnight 2 місяці тому

    Ein Sehr altes Video ist das :D was ein wunder das mir das vorgeschlagen wird :O

    • @michaelwessel4953
      @michaelwessel4953 2 місяці тому

      Evtl. haben Sie einen Bezug zu Malchin? Mein Vater ist leider letztes Jahr von uns gegangen. mfG.

    • @Black_DeathKnight
      @Black_DeathKnight 2 місяці тому

      @@michaelwessel4953 das habe ich mitbekommen (mein Beileid dafür) , und ich habe nicht nur einen Bezug zu Malchin, ich bin auch in diesem Video, deswegen meinte ich auch das mir dieses Video vorgeschlagen wird ist echt Zufall

    • @michaelwessel4953
      @michaelwessel4953 2 місяці тому

      @@Black_DeathKnight sind Sie eines der "Kinder" von damals? 9 Jahre ist das her. Welche(r) sind sie denn :-)

    • @Black_DeathKnight
      @Black_DeathKnight 2 місяці тому

      @@michaelwessel4953 oranges Shirt relativ oft ganz vorne 😅