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ready.
Registered: Feb 2003
Posts: 441 |
C128D - 1571 drive compatibility with demos
Hi,
I just got a commodore 128D, with built in 1571 drive. As far as I read this drive should emulate the 1541 in c64 mode, but... I experienced a few crashes running certain demos. So far Deus Ex Machina and Insomnia both crash right after turning disk side. Risen from Oblivion V2 runs fine in C128 mode.
I thought about a not 100% correct emulation of the 1541 in c64 mode.
Has anybody had the same problem?
thanks,
Ready. |
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... 11 posts hidden. Click here to view all posts....
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ready.
Registered: Feb 2003
Posts: 441 |
Has anybody tried to mount a switch to disable it and work with an external 1541 set as drive 8? Somewhere I read it is possible, but there was no feedback about it.
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MagerValp
Registered: Dec 2001
Posts: 1074 |
Putting a switch on the 1571DCR's ATN line should do the trick.
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Oswald
Registered: Apr 2002
Posts: 5086 |
deus ex worked fine on my c128dcr. |
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Steppe
Registered: Jan 2002
Posts: 1510 |
Works here too. Drive misaligned? |
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ready.
Registered: Feb 2003
Posts: 441 |
Hi,
I think it might be that I touched the head stop adjustment by mistake. I released the screw that holds the stop mechanism on the step motor shaft. Is there any chance to re-tune it? The drive reads, but with some difficulties.
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Graham
Account closed
Registered: Dec 2002
Posts: 990 |
Uhm drive alignment is quite some trouble. It requires an Oscilloscope or some other suitable measurement device and an alignment disk. |
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Steppe
Registered: Jan 2002
Posts: 1510 |
Bah, just turn that screw until it works again... ;-) |
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enthusi
Registered: May 2004
Posts: 677 |
tapes ftw |
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ready.
Registered: Feb 2003
Posts: 441 |
yeah, I guess that the "turn the screw until it works again" is the cheapest and most reliable method. But before that I'd like to have a look at the canonical procedure on how to do it. I tried to google for it but I haven't found any good instruction. Does anybody have such a thing, please?
thanks,
Ready. |
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raven
Account closed
Registered: Jan 2002
Posts: 137 |
Insomnia was 100% done on my 128D, including the loader.
The 1571 is the only drive that didnt cause any problems
with the older version of the loader.
It also didnt crash only on the 128D at the partyplace.. heh
The only difference i know of, from tests i've done, are
when using the 2bit+ATN protocol.
On the 1571, two (sometimes one) extra cycles of delay
are needed between serial bus reads on the 64 side.
Other than that, it *should* work the same, in theory
atleast :)
Btw, can you measure the RPM of your drive? there's a tool
that can do that, the name escapes me though.. |
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