[TUHS] Off-topic: any logic designers here?

Arthur Krewat krewat at kilonet.net
Thu Aug 10 22:41:01 AEST 2017


I've used static RAM in the past for projects and it's worked out quite 
well. No refresh cycles, easy to deal with.

As an example (not saying you need 1MB of ram, or that this would fit 
your project...) 
http://www.mouser.com/ds/2/100/CY62167E_16_Mbit_1_%20M_%2016_%202%20M_8_Static_RAM-319235.pdf

And only $13.20 each.

side note: A friend of mine and I built a 68000-based computer using 
128Kbit static RAM chips back in the late 80's. I wrote the 68K 
assembler for it in C, and eventually wanted to boot-strap UNIX to it, 
but never got that far. Back then, static RAM was expensive - these were 
"free" ;)

On 8/7/2017 10:52 PM, Warren Toomey wrote:
> Hi all, sorry for this off-topic posting.
>
> I just came across this series of videos where a guy built a CPU out
> of 7400 series chips on a breadboard: https://eater.net/8bit/
>
> Anyway, I thought it would be fun to do something similar but with
> a bigger address space and as few chips as I could get away with.
>
> I've got a design that works in Logisim, but I've never actually
> built anything before with real chips. So, if there's someone on the
> list who could quickly look at what I've done and point out problems
> or gotchas (or indeed, what ROM/RAM chips to use), that would be great!
>
> The design so far: https://github.com/DoctorWkt/eeprom_cpu
>
> Thanks in advance, Warren
>



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