> -----Original Message-----
> From: Marko Mäkelä [mailto:marko.makela@hut.fi]
> Sent: 27 February 2002 13:55
> To: cbm-hackers@cling.gu.se
> Subject: Re: Serial Slave 0.7b out
>
> A wild idea: How much does the hardware of the PET disk drives vary?
> Would a custom routine that runs on the DOS CPU work on all types of
> drives ([234]040, 8[02]50 and 90[69]0)?
I wouldn't be particularly surprised. However, I know very little about
drives other than the 1541. (By the DOS CPU I assume you mean the 6502 in
the drive)
> > True. I will tidy up my own code a little first though.
>
> But don't look at the protocol the IRQ loader uses. It tolerates
> arbitrary pauses on the computer side, but it has very bad throughput.
I think I had a look when I was poking around for starting points while I
tried to remember what I used to know about fastloaders. (Somewhere I have
some code for reading disks that have only one sector per track, and custom
5 bits-in-6 GCR. A parallel cable was required for writing, of course..)
> Maybe I haven't pointed it out clearly enough, but the
> current version
> of cbmlink supports also 6551 based null modem connections (3 wires:
> GND, TxD and RxD) on POSIX termios and on Win32.
Ahh; Again I need to spend more time reading other peoples documentation :)
>
> [C2N232]
> > I'd be interested in testing it
>
> In that case, send me your address. After all, I wouldn't
> have invented it if I hadn't visited your place.
Yes, I saw the note on your C2N page. I seem to recall though, that you'd
already made a start on designing the hardware before your visit to the UK;
Did you repurpose it in the light of your visit, or have I misunderstood
something of the history of this project? I will forward my address
privately. Jeanette or John may be willing to do some soldering, but I
cannot ask Jeanette until she returns from South America (two weeks).
Cheers,
Christopher
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