Sorry, yes the hardware can certainly program an EEPROM. What I meant was that a ZX80 Core needs some extra code to program the EEPROM chip if you want to write a new OS & language to it. The machine code (or compiled code) needed is not very complex. Changing areas of the ROM code that will not affect the current running of the system, like changing the character set are also possible.PokeMon wrote:Well in that point you are wrong.1024MAK wrote:/WE for a flash or EEPROM should only be taken low if the computer system it is in can reprogram the chip. This is not something this system can do
It is surely possible to program the EEPROM inboard, I did before while patching the character set for example.
But it doesn't make any sense to connect the /WR input fixed to GND, but can be connected to /WR of CPU.
The thing to remember, is write operations make the chip unavailable for read operations until the chip has competed the actual write, which takes longer than a SRAM or DRAM chip.