Way back I together with a friend developed an IEEE488 to CBM serial IEC bus converter for his CBM610, to use the VC1541.
When I mentioned this interface on the net, I was asked to release it, and here it is. However, I have digged this interface up from a long stored archive (which I salvaged from an Atari ST SCSI harddisk after my Atari gave up by patching the parition table by hand etc...) So I don't know if this is final version, and the schematic is lost as well. I reengineered it and included a description in the xa65 source file.
The serial IEC bus interface is similar to that of the C64.
The IEEE488 interface uses the standard 75160 and 75161 IEEE interface drivers and an unusual chip, the 6532 RIOT (RAM-I/O-Timer). Well, I doubt if one can get this chip today actually, but I think it could easily be replaced with normal static RAM and two VIA or CIA. The timer handling might be confusing, but you had to write a value twice to ensure that the timer starts. This should be easier with the VIA.
Some information on the RIOT 6532 can be found on funet.
There is absolutely NO WARRANTY, neither expressed nor implied! Noone can be held responsible for any damage arising from the use or building of this interface or even from reading these pages! I do not claim nor guarantee that the hardware and software can be used for anything useful!
The ROM, that is made from this file is in par2ser.rom. It includes a two-byte loading address at the start of the file.
From this version I reverse-engineered the schematics of this little
computer. You can find it in
par2ser.ps or
par2ser.png. The xfig
source
for those schematics is in par2ser.fig.