Memory problems with ZX Uno.
Publicado: 14 May 2018, 23:05
Hello There,
I've built a ZX Uno 4.1 from scratch and at the first test the FPGA was found and I could program the SPI flash and run some cores on it. So far so good, the problem is with the memory. I have soldered a IDT SRAM chip, type 71V424S10PHG. When powering up my ZX Uno it says 512K Ok, when testing it in bios no problems found and running the testcore all tests have good result, no errors found.
When running cores on it, for instance the Spectrum core with a 128K ROM, I get memory failures and when running demos or games for 128K Spectrum it sometimes reset or I get a complete crash. Other cores have memory issues too.I am running Bios version 0.72 and the latest Spectrum core. I've tested the memory with ZX-Diagnostics by Brendan Alford, when testing 48K, it passes all the tests. When testing 128K, all banks fail except bank 4.
What could be wrong?
I've built a ZX Uno 4.1 from scratch and at the first test the FPGA was found and I could program the SPI flash and run some cores on it. So far so good, the problem is with the memory. I have soldered a IDT SRAM chip, type 71V424S10PHG. When powering up my ZX Uno it says 512K Ok, when testing it in bios no problems found and running the testcore all tests have good result, no errors found.
When running cores on it, for instance the Spectrum core with a 128K ROM, I get memory failures and when running demos or games for 128K Spectrum it sometimes reset or I get a complete crash. Other cores have memory issues too.I am running Bios version 0.72 and the latest Spectrum core. I've tested the memory with ZX-Diagnostics by Brendan Alford, when testing 48K, it passes all the tests. When testing 128K, all banks fail except bank 4.
What could be wrong?