dave_m
Veteran Member
2a)
I agree with your thoughts on the clock circuitry for the MK I SuperPET - but it did work, was simple and should work with all 8032s. We can always tweak the C/R network values bit later to get the correct timings. Shall I assume we are going that way and update the schematic and PCB layout accordingly? Interestingly, I am just placing an order for 800 off Fairchild 9602's for a job at work... I wonder if we may have some left over?
Yes, OK, clock circuit should work.
2b)
Looking at the logic tonight. Found an interesting difference between the Mk I and Mk II SuperPETs that someone could help out with.
The Mk1 implementation should suffice.
I am trying to keep the number of PALs to a minimum...
It might pay off to leave an extra PAL footprint available to correct any 'oops' in the design. A small 20 pin GAL 16V8 gives flexibility to fix anything that might come up. Or perhaps leave a GAL with six spare pins.
2c) It was just a thought. I started to have a look at the power consumption and realised that the data sheets I have are not particular good when it comes to the current consumption parameter.
Look for an Electrical Parameter called Icc (max). That is a good worst case number for the device current.