Re: 'Frankenstein' Disk Drives, Done Cheap

From: Ingo Korb <>
Date: Fri, 25 Apr 2014 00:14:20 +0200
Message-ID: <>
"smf" <> writes:

> Fast serial should be faster than jiffy dos in C128 mode too.

I'm pretty sure that the last time I tested it Jiffy was slightly faster
than fast serial when both were used with a drive that was not limited
by the access/read time of the medium. It wasn't much, about 25x 1541
speed for Jiffy and 23x or so for fast serial, but considering that the
real-time requirements of JiffyDOS are much easier to meet (hairy timing
just during transfers) than the ones needed by fast serial (hairy timing
all the time if you don't want to miss the host-is-fast-serial-capable
announcement) in a non-hardware-assisted implementation I know which of
the two I'd choose.

> There is also a hack for adding it to a C64 (or C128 in C64 mode) but I
> never did that.

I did, but I disconnected it again because some programs can't handle
it. For example the demo "Error 23 91%" crashes in a certain part if
this hack is present - or to be more precise if the variant used by the
"FSD System" kernal is present because you could connect SRQ/Clock two
either of the two CIAs and I don't know which one FSD uses.

-i 'parallel is much faster' k

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Received on 2014-04-24 23:03:09

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