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Krill
Registered: Apr 2002
Posts: 2980 |
Looking for exotic disk drives, non-1541 clones
Hi,
i am looking for third-party C-64 5.25" serial bus disk drives that are exceptionally incompatible with existing fast loaders due to their not being 1541 clones. They come with very different ROM code, register and memory layout, peripheral ICs and even processors.
Specifically, these are
MSD SD-1 and SD-2
Digilog FD 2064 and 2064/2
Tecmate NPH-501C with a firmware reporting as "Century Planning Corp. CX-500"
If you have these or other such devices i am not aware of, please tell.
Willing to trade, but remote code testing and debug sessions are welcome, too.
Thanks! |
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chatGPZ
Registered: Dec 2001
Posts: 11386 |
Quote:Now, enable loading by t&s, or wait for IFFL implementation?
yeah, why remove unneeded junk when you can just aswell make it more complicated? =) |
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Krill
Registered: Apr 2002
Posts: 2980 |
HCL: Glenn has: http://csdb.dk/release/?id=49683. Otherwise, use AR6 monitor:
@*80
t c000 ffff c000
<go have a coffee or ten>
s"romdump",8,c000,ffff
H Macaroni: Could you make a ROM dump as well?
Thanks! |
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Krill
Registered: Apr 2002
Posts: 2980 |
Quote: Quote:Now, enable loading by t&s, or wait for IFFL implementation?
yeah, why remove unneeded junk when you can just aswell make it more complicated? =)
Because at some point even removing "unnecessary junk" won't be enough for certain people, making more efficient disk usage the next logical step. |
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chatGPZ
Registered: Dec 2001
Posts: 11386 |
if it comes with all the tools that let me build a disk image just as easy (as in: no manual work required) - go for it :) |
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Krill
Registered: Apr 2002
Posts: 2980 |
Quote: if it comes with all the tools that let me build a disk image just as easy (as in: no manual work required) - go for it :)
I thought of just enhancing good ol' cc1541 :) Same for the weirdo formats for superfast loading i might or might not put into action some day :D |
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JackAsser
Registered: Jun 2002
Posts: 2014 |
Quote: I thought of just enhancing good ol' cc1541 :) Same for the weirdo formats for superfast loading i might or might not put into action some day :D
Yay! I approve! :) |
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Hoild
Registered: Apr 2005
Posts: 29 |
Quote: If those are clones, they should be rather compatible. Any say on that? :)
The BlueChip RFC501 was perfect with every fastloader so far.
Its clone, the BondWell, has died Teh Cap Death, dunno if the exploded power buffer cap totally killed it or still repairable.
Regarding the BlueChip RFC512, the 1571 clone, I am not sure, never bothered about using it with a C64 or 128, just storing it, BUT I recall it has a setup of interface chips (CIA/VIA) different from a real 1571. Will check it later. |
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Krill
Registered: Apr 2002
Posts: 2980 |
Turns out the firmware of HCL's Digilog FD 2064 is identical to the original 1541's ROM contents, while the FD 2064 dump i have here is an entirely different beast.
I vaguely remember i once read that there were some copyright issues with ROMs in 1541 clones, so could it be that HCL's drive is actually an OLDER, more compatible version, and that later revisions came with different firmware AND hardware changes that went along with it, reducing compatibility a lot?
Anybody know more? :) |
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HCL
Registered: Feb 2003
Posts: 728 |
Oh, interesting! As i said i always felt my drive is *quite* compatible, even though not 100%. ..and the reason why SAX don't work must be that the HW architecture is different.. Perhaps my SAX stores (A or X) instead of (A and X) :P. |
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Krill
Registered: Apr 2002
Posts: 2980 |
Quote: Oh, interesting! As i said i always felt my drive is *quite* compatible, even though not 100%. ..and the reason why SAX don't work must be that the HW architecture is different.. Perhaps my SAX stores (A or X) instead of (A and X) :P.
H Macaroni's Digilog snapshots suggest a Synertek SY6502 controller (http://www.classiccmp.org/cini/pdf/SYM/SYM1_REF05.pdf) rather than our trusted MOS 6502.
I didn't know that some 6502 variants without 16-bit, power saving or other extensions do not support SAX, which i regarded as one of the few safe illegals. But then i didn't know of the SY6502 before this thread either. Must be a reason those opcodes're called illegal. :) |
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