uIEC/SD == AWESOME!

[Philip Belben]

I'm coming late to this discussion, and I'm only on CCTech, so I may not 
have seen everything (not to mention not having had internet over 
Christmas, and having a lot of messages to skim as a result), but I'd 
like to get my bit in.

Jim Brain wrote:

>> I'll check into this (any other links to HPIB interfaces?)  Right now, 
>> I'm fighting with the fact that I believe the full complement of 
>> IEEE-488 signals is 17, and it sure would be nice if I could get it 
>> down to 16
> Scratch that.  I miscounted.
> Jim

You can probably make do without REN, too.  The PET has it tied to 
ground, i.e. permanently asserted, for a start.  Just assume it's 
asserted and you won't go far wrong!

Commodore drives do some strange things with GPIB addressing.  Bit 7 
isn't supposed to be used, but I think Commodore use it to add a flag to 
the primary address when opening files.  ISTR they may even use bit 6 
this way, thus preventing you from having a device at (disk drive)+16.

I don't have much HP stuff (although I do have some 80-series boxen), 
but one drive I'd like to see emulated would be the Tektronix 4907. 
This was a device for adding 8-inch floppies to your Tek 4050 series.

The 4050 series has its own quirks with GPIB.  The one that most annoyed 
me when I was using a Commodore 8050 with my Tek 4052 was its habit of 
asserting IFC when you least wanted it to.  Like immediately before 
loading a program, thus causing the 8050 to forget all I had laboriously 
told it about the program I wanted to load...

Philip.