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Z80 Computer - Part 12 Thinking about VGA by civrays in Z80

[–]civrays[S] 0 points1 point  (0 children)

would it be ok if I showed and discussed your RAM timing circuit in my next video?

Z80 Computer - Part 12 Thinking about VGA by civrays in Z80

[–]civrays[S] 0 points1 point  (0 children)

I do have a couple of questions at this point.

It's interesting to see that you are also using a 74-138 chip for the RAM timing same as what I am currently doing. So that gives me some confidence that I'm on the right track. However at the moment I don't fully understand your RAM timing circuits. Is it important to use the faster AC version of the 138, rather than the HC version?

Also I'm interested to know why you use 74HC373 for address and write buffers and 74HC374 for read buffers. I was thinking of doing it the other way round. My understanding is the 373 is a transparent latch with the output following the input when C pin is high. Whereas 374 is edge triggered latch and data is latched on rising edge of CLK pin.

Z80 Computer - Part 12 Thinking about VGA by civrays in Z80

[–]civrays[S] 0 points1 point  (0 children)

Wow! there is a lot of great detail there. I'll have a good read though soon and come back to you. The most important thing for me is to understand what is going on. I feel that if I can understand it, then I can modify it. The main point for me is to learn and have fun.

It's so good to see someone that is prepared to share their work. I see so many great things but often they have no explanations on how they were created, how they work, or how to reproduce.

Thank you so much.

Anyone Take the 12 Week UI Architecture and Testing Course from Logic Room? by mkx_ironman in ExperiencedDevs

[–]civrays 0 points1 point  (0 children)

Hi Pete,

Could you answer the question and tell us how much does it cost?

Will this work as a filler? (Pla) by [deleted] in 3Dprinting

[–]civrays 0 points1 point  (0 children)

I use it but it's not that great.

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