From: Baltissen, GJPAA (Ruud) (
Date: 2004-09-09 10:53:46

Hallo Marko,

> Hmm, if you were copying individual files, wouldn't it be 
> possible to tell the CBM-HD to LISTEN and the 8250 to TALK?

You mean sending a TALK to the 8250 and a LISTEN to CBM-HD? On itself a good
idea as there is only one transfer par byte instead of two as it is now.
Transferring files isn't a problem as the sender will activate EOI at the
end of the file. But how are you going to tell the sender to activate EOI at
the 256th byte?

Having had some good help from Spiro I thought it was time to shift my brain
into a higher gear. And I got this: M-R and M-W both have an option to tell
how many bytes I want to read/write. The question is if the last byte is
sent with an active EOI but that is something that can be tested quite easy.

But the docs state that one can only read from 1 up to 255 bytes. I need to
read 256. I could try if 0 is translated as 256 otherwise I have to do it in
two batches.
More worrying is the fact that I only can write up to 34 byte. Is the
computer to blame or the drive? In case of CBM-HD I even didn't know what to
do with this number; at this moment I keep on storing bytes until I get an
EOI or an ATN. Hmmm, I can adjust my test program a bit and see what the
effect is on a real drive: I'll write more bytes then actually planned and
then will read back the contents.

   / __|__
  / /  |_/     Groetjes, Ruud
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