10 Aug
2017
10 Aug
'17
2:41 p.m.
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_Sta…
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