20 Jul
2006
20 Jul
'06
7:33 a.m.
Fred Cisin wrote:
Hmm, if I'm thinking right, all I need to do is invert A7 from the ISA BUS
before it goes through the selection circuitry, and that'll plonk the FDC at a
base address of 0x370 rather than 0x3f0. Does that sound sensible? There's
even an unused NAND gate on the board that I can use to do the inversion if so.
I think that should work...
cheers
Jules
In the same
heap of boards was another 8 bit card with a Zilog 765 FDC on it,
so that one might be a possibility too (no on-board ROM, but it looks to be
fixed at the PC's primary FDC address - maybe it's possibly to hack some of
the address lines to make it appear at a different address, though)
certainly POSSIBLE