do > Well, I'm sure that your correct in that most Z80s only have <= 64k,
do > but there are some exceptions, such as the TRS-80 Model IV and the
do > Commodore 128 (as the name implies).
There are many others, including the ZX Spectrum 128, +2 (the model I
owned)& +3. This could use the extra memory for a RAMdisk (it was
reffered to in the manual as a Silicon Disk).
Also relatively popular here (Scotland) was the Amstrad PCW series, they
ran CPM and came with a word processing package called locoscript (you
had
to be "loco" to use it). There was a Drive 'M' stored in memory. This was
around 100k in size on a 256k machine.
sk > One way might be to implement a bank switching model for embedded Z80
sk > or upgraded computers. This means to put the reference scheme into
sk > the kernel
do > Of course, there's no reason you can't go ahead and pick a bank
do > switching scheme, my point is simply that I doubt it will be
do > compatable with other machines that don't happen to use the same
do > scheme.
If anyone is seriously considering implementing anything unix-like on a
Z80 machine then I'd like to help. The only drawback is that I'm not that
good (read appaling) programmer. Although I sold my Spectrum and my mum
her PCW8256, I can emulate a spectrum under DOS or linux.
Thanks,
David C.S. Prior
