exxos's Atari, Amiga & retro forum

I know you can use 41256 chips as replacements for 4164s, so it might be worth a look at those. And I have some I can send you a few to try?

stephen_usher wrote: ↑Thu Mar 18, 2021 12:37 pm
Just a thought. There are quite a few SMD 16bit DRAM chips available at lowish prices. Use one of those and just not use the upper 8 bits? I guess that they're bigger than a single 41464. Also 3.3V, which means more circuitry.

e.g. https://uk.farnell.com/integrated-silic ... dp/2901170

It is an option id thought about. I might use the same stuff off the TF328 and see how it looks.

PhilC wrote: ↑Thu Mar 18, 2021 1:13 pm I know you can use 41256 chips as replacements for 4164s, so it might be worth a look at those. And I have some I can send you a few to try?

Unfortunately those are 1 bits. I'm looking for wiiiiiiiiiider. 41464 is still looking the best option.

This is just for the Video RAM. Main system ram will be 10ns STATIC RAM.

PhilC wrote: ↑Thu Mar 18, 2021 1:13 pm I know you can use 41256 chips as replacements for 4164s, so it might be worth a look at those. And I have some I can send you a few to try?

He wants a single 8 bit wide chip, rather than 8 1 bit ones. This is the problem.

terriblefire wrote: ↑Thu Mar 18, 2021 1:35 pm

PhilC wrote: ↑Thu Mar 18, 2021 1:13 pm I know you can use 41256 chips as replacements for 4164s, so it might be worth a look at those. And I have some I can send you a few to try?

Unfortunately those are 1 bits. I'm looking for wiiiiiiiiiider. 41464 is still looking the best option.

This is just for the Video RAM. Main system ram will be 10ns STATIC RAM.

Just dual-port some of the SRAM and then you can be hacky and write directly into the video memory rather than having to push the data through the VDP.

ach for first version i'll leave the 41464s in ...

terriblefire wrote: ↑Thu Mar 18, 2021 2:43 pm ach for first version i'll leave the 41464s in ...

I'll have a look what I have as I have far too much NOS old ram.

So far I've found 12 x Mitsubishi M5M4464P which are 65536 x 4 bit, the same as the 41464, not sure if they aren't a little slow at 120ns.

Yeah I have too much ram, if its 4bit then it might be possible to use P21014? 256k x 4 bit. Got a few different variations and brands of similar chips and found my stash of 41464 chips.