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Krill
Registered: Apr 2002
Posts: 3104 |
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: 11540 |
Quote:It's not like disks are brimful in most cases, or that a few more blocks of the bootstrap program would hurt that much.
you really should make a demo again, i think. the disk is always full =) |
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Krill
Registered: Apr 2002
Posts: 3104 |
Quote: Quoting H MacaroniFound it, model name: FD2064. That *looks* exactly like my drive also, outside and inside :).
H Macaroni: Thanks a lot!
HCL: If your drive is *mostly* compatible and H Macaroni's isn't, i wonder if there maybe have been different versions of that drive, with different compatibility.
The ROM dump i have here implies that VIA1 (originally mapped to $1800) is at $3900 and not an actual VIA, but some other logic only implementing port B ($1800) with static direction. Furthermore, this port seems to be accessed via $3900, $3904, $3908 and $390c alike.
VIA2 (originally at $1c00) is at $3c00.
The GCR tables are at $f7d7 and $fcb1 rather than $f77f and $fa80.
Now, it may be that if later, more compatible versions exist, yours is one of that, with the ROM tables at their original locations and, most importantly, slightly more complex address decoding logics so the VIA ports are at the standard locations.
Care to check, or make a ROM dump for me? Thanks! ) |
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Krill
Registered: Apr 2002
Posts: 3104 |
Quote: Quote:It's not like disks are brimful in most cases, or that a few more blocks of the bootstrap program would hurt that much.
you really should make a demo again, i think. the disk is always full =)
Including the dir track! Now, enable loading by t&s, or wait for IFFL implementation? And damn, disks are so expensive these days, can't afford a second side. :D
You're right about making another demo though. Some day... |
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HCL
Registered: Feb 2003
Posts: 731 |
@Krill: All that stuff seems to be in place at original addresses, so it surely seems to be a different version than H Macaroni's drive. Though it says FD 2064 on it, no more no less.
ROM dump, sure i could always fix that somehow.. Or do you already have a tool for that!? :). |
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chatGPZ
Registered: Dec 2001
Posts: 11540 |
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: 3104 |
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: 3104 |
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: 11540 |
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: 3104 |
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: 2038 |
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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