Hallo allemaal,


1541IDE is nearing the end so I'm thinking about 8050 already. As I once
said my idea was to replace the 6530 with the IDE-circuit plus some ROM
and RAM. One reason I proposed this because I thought I _HAD_ to replace
the 6530 because of the ROM. But I just realised that this is
unnecessary at all: the ROM is activated by a seperate pin, just tie it
to + 5V and add my own EPROM. Advantage: in this way it could be
possible to use the floppy disk and harddisk at the same time (with
1541IDE it is either or).

A small drawback that I only realised some days ago, is that, although
the Disk Controller (DC) part of the 8x50 is equiped with a 6502, it is
only used as the 6504 on the 4040: the 6502 only uses one 8 KB range,
A13..15 are not connected at all. The 6530 only provides 1 KB of ROM. I
can expand it to 2 KB. But I only hope that I don't need more. The
reason for this is that I expanded 1541IDE with a lot of extra functions
but I have no idea yet which ones should be executed by the DOS-6502 and
which ones by the DC-6502. And using both the FD and HD will consume the
most space of the available 2 KB.


--
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   / /  |_/     Groetjes, Ruud
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    \___|       URL: Ruud.C64.org

 
 



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