How do I program a 74LS74 D-flipflop in a GAL?

Hallo allemaal,


Michał inspired me finally to design and produce my first PCB. I first created a board of my Debugger for the PC but decided to start with its parent, the Debugger for the 6502, http://baltissen.org/newhtm/debugger.htm , for sheer practical reasons. But I upgraded it a bit: I simply cannot find the 74LS76A anymore so I decided to use the circuit at the bottom of page, using a 74LS74. That meant four 14-pins ICs. But I have no idea how to program a D-flipflop in a GAL and that’s why I ended up with a GAL and the 74LS74.
I’m quite sure I once found that information, stored it, but have no idea where ☹ Therefore my question. If possible, for CUPL for DOS or WinCUPL.

FYI:
- I cannot use the CLK input of the GAL because the CLK of the second FF depends on the Q-output of the first one.
- The clock HAS to be edge triggered. (otherwise I could use http://forum.6502.org/viewtopic.php?f=10&t=3255)
- I don’t need the Preset and Clear input.


This card has a bus meant for the various Elektor computers. But that makes it unusable for any other 65xx computer. For the C64/128 I hand-soldered an interface card that you stuck in the expansion port and for the various 6502 machines a little card that was placed between the 6502 and the motherboard. This 6502 card is nearly finished. Here I faced the problem that, creating a two layer board, I wasn’t able to connect all the address lines of the CPU with the interface connector in a neat way. So, thanks to Michał’s advice, I decided to lead two wires between two pins of the 6502 and that seems to work out fine!

I hope to hear from you.


With kind regards / met vriendelijke groet, Ruud Baltissen

http://www.baltissen.org<http://www.baltissen.org/>






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