Hi everyone, a very simple question, surfing the internet looking for components for the commodore 64, I found the SaRuMan-64 module, my question is: can I use this component to replace the ram of msx and msx2?
for the same spacing is not a problem, I only care if it is compatible, I had seen modern chips used for the VDP, but I had not seen modern chips used for the ram, this gives me a new idea for a portable MSX project
Rather than looking at the SaRuMan-64 your should look at the data sheet of the CY62128ELL-45SXI and see if that could be compatible with the MSX Banking as it is a 1Mbit (128k x8) Static RAM. I don't think one module would do it because of all the different makes and then there would be compatibility issues but if you're designing your own hardware MSX then it might be more likely.
I think SaRuMan-64 has 128 kB because it has a mapper C128 compatible.
CY62128ELL-45SXI chip is the SRAM. It is easier to address than DRAM.
The little chip is to manage the mapper and the 3-pin chip is to convert 5V to 3.3V because chips are powered at 3.3V.
SaRuMan-64 probably can't be used on MSX because of the mapper.
It's just an assumption. The small chip may be there to simulate 4-bit DRAMs. And in this case, the size of the SRAM would be 128kB to put the low 4bits on 64kB and the high 4bits on the other 64kB, or it's just a question of price. 128kB is easier to find and cheaper. In this case, 64kB is unused.
The first solution seems the best to me. It's a bit like putting a Memory Mapper on MSX1.
