From: Wolfgang Moser (womo_at_news.trikaliotis.net)
Date: 2008-12-13 21:19:48
Hello Craig,
one addition to my post.
Wolfgang Moser schrieb:
> [...]
> I found out that you cannot reliably transfer data
> between the C64's IO area and the REU. The grade of
> unrealibility depends on the transfer mode choosed.
> While normal transfers (REU->C64 or C64->REU) are
> fairly stable (but not 100% rock solid), the verify
> operation seems to be the most criticial one.
> [...]
I made this observation for original Commodore
REU hardware, a 1750, a 1700 and two different
1764 (one of them extended to 512KiB).
The REU (re-) implementation of Gideon
Zweijtzer's 1541-Ultimate for example does not
show these unreliabilities. I did not implement
into-the-deep exhaustive tests to check for rock
solid operation, but it runs very stable for at
least some of my machines.
Software emulators like VICE also don't suffer
from any unreliabilities.
But take note that any sort of emulator always
has got the potential of being incompatible to
the original. With all my tests I discovered a
lot of such incompatibilities and Spiro from
the VICE team as well as Gideon were able to
fix a lot of REU related bugs. Nvertheless we
can never be sure that we already found all of
them.
Womo
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