|
This Jumper Block
allocates either the
upper 256K or the
lower 256K of the 512K ROM
to the ROM address
space (FC0000h - FFFFFFh).
Alternatively the
whole 512K of ROM
can be allocated to the address
range F80000h - FFFFFFh.
Note:
For the 512K
ROM option to work correctly IC2 pin 6 needs to be
isolated and tied high, or (better) IC2 reprogrammed so
that A18 plays no part in IC2's ROM address
decoding scheme.
The desired
option can be set with a Jumper (as shown in RED below). |
