HP-IB, Amigo/cs80 was Re: hp 9153 floppy & disk

On Fri, Feb 12, 2010 at 2:15 PM, Tony Duell <ard at p850ug1.demon.co.uk> wrote: How about an AVR-based box (open, no BGAs, etc) perhaps with an SD socket or CF socket, with an HPIB interface that will work with a) "real" IEEE-488 hosts and b) PET/CBM hosts which are electrically GPIB/IEEE-488, but might have some "Commodoreisms" when it comes to timing and throughput and such since they are implemented as 6502 code wiggling PIA and/or VIA I/O lines? Once you have a platform that is electrically and timing-compatible with HPs and PETs, it shouldn't matter if you choose to implement Amiga/CS80 or CBM "DOS" at the firmware level, and a generic "IEEE Disk" would be useful in a number of environments, not just HP and CBM. I wouldn't require that the same box be able to do either Amiga/CS80 and CBM DOS without a reflash, but it might not be impossible if the MCU has enough code space and perhaps a spare I/O bit to look for a configuration jumper (or even some sort of "magic" secondary address to send configuration requests to). There are several options in the PET/CBM/C64 arena for IEC (serialized IEEE), but so far, I don't know that any of the discussions or proposed projects for a parallel IEEE disk have progressed to the point of hardware you can build and firmware you can download. I'd love to have one, though. -ethan