Re: 'Frankenstein' Disk Drives, Done Cheap

From: Ingo Korb <>
Date: Tue, 22 Apr 2014 21:22:02 +0200
Message-ID: <>
Chris Osborn <> writes:

> I'd like to add the C128 "fast serial" support to it eventually, but I
> haven't found anything that says if it's really the same protocol
> without the long delays or it's entirely different. I guess I need to
> hook up my Saleae and check it out for myself.

Arbitration is the same, but the data transfer is completely different
and just to make it more annoying there is a completely separate command
set for it of which you'll want to implement at least the command for
fast-loading a file. You'll need more if you want to support CP/M, which
in my opinion is the only excuse one could bring forward to add fast
serial support to anything - it assumes that any drive which does not
speak fast serial is a 1541, which means that D71 images only work by
accident and D81 images not at all unless the device supports fast serial.

Or you could implement JiffyDOS, which is a bit faster, available on
more systems, can be soft-loaded with no hardware modifications required
and still needs a special case for LOAD.


       Message was sent through the cbm-hackers mailing list
Received on 2014-04-22 21:00:49

Archive generated by hypermail 2.2.0.