Komputery z Z80 > TIMEX

SDRAM on the lower ram

(1/6) > >>

Powervr:
Haha and it worked...
Why? I have some ideas to implement and need to have some type of memory control...
This is with an buffer but will do with an cpld
https://youtu.be/lSKFRrdOxTY

KWF:
That is nice. Have you used SDRAM or SRAM? Is your of VRAM solution similar to http://sindik.at/data/vram/?

damik:
Are you sure that you used SDRAM (synchronous dynamic random-access memory) in this project?
And what specific type of SDRAM do you use, SDR or DDR, maybe the newest DDR5?
Refreshing these memories in such a slow system as ZX Spectrum or Timex must have been a problem?
Probably adapting such low-voltage memories to 5V logic may also constitute an additional complication of the circuit.

Perhaps it will make more sense to use SRAM (static random access-memory) there, the solution is much more reliable than constantly using dynamic memories.

trojacek:
I do not see any SDRAM here, only a Hitachi SRAM 128Kx8.

damik:
Ok, now I see that there is ordinary SRAM HM628128 and it's even much bigger than you need, because you have 128KB and you only need 16KB, maybe it's better to use 62256 (32KB) and it's still twice as big. :)

Nawigacja

[0] Indeks wiadomości

[#] Następna strona