I have two ATR 8000 boxes with 64KB handed down from my mentor in the 1980s. They ran the disk drives , modem and printer for the Action Annex BBS in Vancouver, WA. They were trick devices considering the alternative of hanging a daisy chain of SIO devices to do the same thing. There is a web site that has schematics and the ATR manual can be found online. The guy is in Bratislavia and documented more about all the disk drives in one blog than ever seen before.
http://blog.3b2.sk/igi/post/ATR-8000.aspx All sorts of goodies on this site.
My current problem resurrecting them is the power supply design was not the best.
The 22 VAC transformer and it's so called bridge filtercap/regulation worked, albeit it was not designed for 20 years of operation. It did last 8 years for the BBS. I remember one of the ATRs blew a pair of voltage regulators out once, and was replaced.
One of the ATR machines worked and the other has logic gates going from a probe ,but is not communicating on the sio port anymore. I patched in +12V and +5 from a PC supply and got one working for about an hour.
Why would I want to wake up this bit of coolness from the BBS world?
I was gifted 400 floppies of double sided, double density format disks with probably 1000-2000 MIDI files typed in by my mentor's wife. They are unique and copies of public domain songs in MIDI format that can still be played on todays synthesizers or your emulated ones on the PC. Two of the MIDI files ended up as demo files on the Windows 95 CDROM release my Microsoft. Bill Gates used to visit the BBS and download them.
I have the actual drives used to write the disks, about 5-6 5.5.25" drives, so I know alignment issues won't be a problem.
I'm leery of trying to just buy a XF551 drive and take my chances losing data.
So, anyone an expert on finding glitches on a truly neat board? All the chips are labeled on the board. It needs sockets.
I have a spare board with eproms that read, one spare z-80 and likely just need to xray the board and find the short in it. The ram was recycled from some other project and was installed. I can see where someone has used the 4264s with wire wrap on another Atari 800. The ram bank and the z-80 went thermal and quit.
I even tried putting back in the stock 16KB ram and set the jumpers to see if that would get it working to no avail.
Both boards are REV C. Which was the latest I think. The eproms have code version 3.02 written on the labels.
I never really got into using CP/M for an OS, as I was chasing IBM PC sales and programming after 1986 or so.
Anyone spare a true DSDD drive for a loan or know where I can get the controller parts cheap if I can't bless this mess of two boards?
I have an several 800s, and some spare parts to trade for a controller for the drives. ?
I am also looking into an ISA IBM pc floppy controller of the vintage with the use of the atarisd.exe app. which might not read dsdd anyway.
Meanwhile, the other Atari 800s were sold at auction to fund some of this recovery project and a few Kindle Fire tablets for the homeless shelter in Vancouver, WA.