Junkbox CP/M system?
cclist at sydex.com
Mon Apr 23 19:32:21 CDT 2007
On 23 Apr 2007 at 18:47, Jules Richardson wrote:
> Wouldn't it take a fair while to reverse-engineer all the address decoding and
> additional logic (such as for driving the LCD) in the system? i.e. just to
> find out exactly what you have in order to start thinking about writing
> software is reasonably non-trivial.
That's why we have disassemblers, no?
> It's probably nothing like as much as designing/building something from
> scratch, but then at least with doing something from scratch there's the
> benefit of knowing exactly how it fits together. Plus I suspect for many
> people, designing from a box of chips ends up being more rewarding...
Probably so--but then I said that I was lazy. ;-) Even in the
"assemble it from chips" case, I'd rather use a Z180/Z280/64180/EZ80.
Less wiring to do.
> Hmm, do they? I passed up on some '386 ones recently (I was briefly tempted
> mainly for the 40x2 displays). Some more SRAM would have been nice to have,
Well, look at this one on our favorite auction site:
Quite a bit of stuff in there for $20.
> From a programming point of view, how easy is accessing IDE compared to a
> typical FDC ('765 or similar)? I did write some assembler to access an IDE
> drive about 12 years ago, but have long since forgotten details! :-)
CF IDE is easy--it's 8 bit. HD IDE uses a 16-bit data path for
sector data transfer, so that makes things a bit more involved.
Otherwise, the register set looks pretty much like a WD1003 PC-AT
type disk controller.
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