The TFMSX Is out of the bag...

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PhilC
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Re: The TFMSX Is out of the bag...

Post by PhilC » 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?
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Re: The TFMSX Is out of the bag...

Post by terriblefire » Thu Mar 18, 2021 1:35 pm

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.
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Re: The TFMSX Is out of the bag...

Post by stephen_usher » Thu Mar 18, 2021 1:36 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?
He wants a single 8 bit wide chip, rather than 8 1 bit ones. This is the problem. :-)
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Re: The TFMSX Is out of the bag...

Post by stephen_usher » Thu Mar 18, 2021 1:38 pm

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. ;-)
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.

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Re: The TFMSX Is out of the bag...

Post by terriblefire » Thu Mar 18, 2021 2:43 pm

ach for first version i'll leave the 41464s in ...
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Re: The TFMSX Is out of the bag...

Post by PhilC » Thu Mar 18, 2021 4:56 pm

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.
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Re: The TFMSX Is out of the bag...

Post by PhilC » Thu Mar 18, 2021 6:56 pm

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.
If it ain't broke, test it to Destruction.

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