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32KB Dual Port Video RAM

A project log for SPAM-1 - 8 Bit CPU

8 Bit CPU in 7400 with full Verilog simulator and toolchain

john-lonerganJohn Lonergan • 10/01/2022 at 19:42•2 Comments

Started a new module to support the VGA component of SPAM-1.

I wanted 32KB of dual port ram for video but wasn't willing to shell out for it. I found a couple of 16KB PLCC modules so I need a board to support them as part of SPAM-1 and the new sub-project is a PCB to create a 32KB module that's R/W from the CPU side and Read-only from the GPU side and fast enough for 160x120 approx video.

It's a work in progress.

https://oshwlab.com/john.lonergan.sharing/32kb-dual-port-video-memory

I want it to fit amongst my breadboards so it's size constrained.
Previous log

Why? Why? How?

08/27/2022 at 17:53 • 0 comments

Discussions

John Lonergan wrote 10/02/2022 at 19:14 • point

Thanks. Even better when the parts arrive, which are hopefully not counterfeit and then integrated into SPAM-1.

Definitely the simplest approach is to implement something like the ansi or VT escape codes. But not today.

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Augusto Baffa wrote 10/02/2022 at 12:49 • point

Pretty cool !

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