18 Apr
2000
18 Apr
'00
7:29 p.m.
On Tue, Apr 18, 2000 at 06:11:15PM -0400, allisonp wrote:
Limited logic, one latch. No rule said only one
address for the data read
or write.
I'm curious, how can it be done with just one latch? In my ISA-8 thing,
I used one latch for writing data, to hold the low byte until the PC writes
the high byte. And another in the other direction, to catch the high byte
when the PC reads the low byte. Then a 244 to allow writing the high byte,
and a 245 for all other cases (including 8-bit register accesses). Is there
some way I'm not thinking of, to flip one 373 around and use it in both
directions???
John Wilson
D Bit