Michael wrote:
I have a question, too, please. What does the 74xx573 LE (Latch Enable) signal look like? Is it an active-high pulse qualified by the clock?
TIA. Happy Holidays. Mike
Essentially yes.
It's a transparent latch and I used them as I had a few when I considered using them in my '816 project otherwise I might have used something else. (And because I had a few I'd already used them some years back in my original 6502 project, so knew they'd work)
Here is the logic in the GAL:
Code:
;********************************************************************************
;* Latch:
;* An 8-bit latch - it latches data on the falling edge and is transparent
;* when high, so output is normally low and toggles high to low on a write.
;********************************************************************************
LTCH = latchOut & /RW & CLK
latchOut is the address ($00F8)
-Gordon
_________________
--
Gordon Henderson.
See my
Ruby 6502 and 65816 SBC projects here:
https://projects.drogon.net/ruby/