Nice Restoration! I always was amazed at the capabilities of the DAI since I learned of its existence. Concerning the stacked ROMs: There were some ROMs that could be bonded CS active high instead of active low giving the possibility of double the capacity without any more logic. In the early days more pins meant more expensive parts so maybe they opted for this route saving board space and additional sockets by simply piggybacking the roms.
@@thebyteattic BTW you mentioned there are schematics for the DAI by an user group of the day when. Is this available somewhere / do you have the link or a PDF of the schematics?
.. well I searched an yes I found them, and Now I remember I had looked at them some years ago already and were putting the evaluation as a back burner project for later because the scan was incredibly fragmented (the scan part 1 of 2 which contains sheet 0 to 6 is split into a 30 page pdf 📗➕📘🟰🧻🧻🧻) in many pieces which I had no time back then to puzzle together and print to a large format. That would have been an awesome pandemic project when there were time to do such silliness 🤣
@@0toleranz I will uploaded corrected schematics to a Github repository as soon as I finish the restoration. There are some errors in the DAInamic club schematics.
I wonder if the piggy-backed ROM chips are patching some parts of the ROM. Obviously that could only be additive as far as the bits being set are concerned, but that could potentially still be useful. Only way to know for sure would be to separate them. Would be interesting to know 🙂
Follow you for a period of time, I'm very confident your work is over specification and that's what I love.
Looking forward to the rest of the series…
I'll be editing the new videos as soon as possible!
Amazing attention to detail and incredibly pedantic work. If you get the job done, do it perfectly!
Excellent work so far! I hope you can get the computer working.
Spoiler alert: it's working right now ;)
Nifty !
Nice Restoration! I always was amazed at the capabilities of the DAI since I learned of its existence. Concerning the stacked ROMs: There were some ROMs that could be bonded CS active high instead of active low giving the possibility of double the capacity without any more logic. In the early days more pins meant more expensive parts so maybe they opted for this route saving board space and additional sockets by simply piggybacking the roms.
Knowing what I know now, I think they stacked the ROMs to increase the drive on the data bus! Surreal that such a thing was needed...
@@thebyteattic BTW you mentioned there are schematics for the DAI by an user group of the day when. Is this available somewhere / do you have the link or a PDF of the schematics?
.. well I searched an yes I found them, and Now I remember I had looked at them some years ago already and were putting the evaluation as a back burner project for later because the scan was incredibly fragmented (the scan part 1 of 2 which contains sheet 0 to 6 is split into a 30 page pdf 📗➕📘🟰🧻🧻🧻) in many pieces which I had no time back then to puzzle together and print to a large format. That would have been an awesome pandemic project when there were time to do such silliness 🤣
@@0toleranz I will uploaded corrected schematics to a Github repository as soon as I finish the restoration. There are some errors in the DAInamic club schematics.
Remember it from the computer magazine. With many periferals if i remember well
I wonder if the piggy-backed ROM chips are patching some parts of the ROM. Obviously that could only be additive as far as the bits being set are concerned, but that could potentially still be useful. Only way to know for sure would be to separate them. Would be interesting to know 🙂
Knowing what I know now, I think they stacked the ROMs to increase the drive on the data bus! Surreal that such a thing was needed...