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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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Hoild
Registered: Apr 2005
Posts: 29 |
I have a BlueChip 1541 clone, a BlueChip 1571 clone, and a "Bondwell" that seems to be a clone of BlueChip's 1541 clone... |
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chatGPZ
Registered: Dec 2001
Posts: 11386 |
Quote:And nobody cares how big the installer with the drive code is, really.
it must sure sound funny when i say it, but: you != everyone |
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Norrland
Registered: Aug 2011
Posts: 14 |
Quoting Krill
H Macaroni: Thanks! Tell me when you've found it. The ROM dump i have here suggests that they have saved a VIA by using some discrete logic chips, but the thing didn't come with schematics by any chance? (Some hi-res pics of the insides would rock, though.) :)
Found it, model name: FD2064. No schematics and as I can understand no info in the manual that helps you.. here's the pics.
Outside FD2064
Inside FD2064 1
Inside FD2064 2
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HCL
Registered: Feb 2003
Posts: 728 |
Quoting H MacaroniFound it, model name: FD2064. That *looks* exactly like my drive also, outside and inside :). |
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Krill
Registered: Apr 2002
Posts: 2980 |
Quote: Quote:And nobody cares how big the installer with the drive code is, really.
it must sure sound funny when i say it, but: you != everyone
Yes, very true in general.
However i don't see why anybody would reduce installer size to gain a few measly kilobytes at start-up. It's not like disks are brimful in most cases, or that a few more blocks of the bootstrap program would hurt that much.
But everyone is free to use a modified version, even if it means limiting the use to 1541. However, i won't add a configuration option for that, just like i won't add an option to disable checksumming for that extra bit of performance. :) |
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Krill
Registered: Apr 2002
Posts: 2980 |
Quote: I have a BlueChip 1541 clone, a BlueChip 1571 clone, and a "Bondwell" that seems to be a clone of BlueChip's 1541 clone...
If those are clones, they should be rather compatible. Any say on that? :) |
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chatGPZ
Registered: Dec 2001
Posts: 11386 |
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: 2980 |
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: 2980 |
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: 728 |
@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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