CB030 flash is SST39SF040 so it is reprogrammable with a programmer like TL866. CB030 is available, PM me your address, I’ll add the shipping cost.
Bill
I am trying to “white room” a 68000 CPU based computer. By white room I mean without direct reference to other designs. I am not trying to “recreate” a “retro 68000” computer, I am just trying to create ‘a’ 68000 computer, the hard way, the long way.
As a starter project I took on the Z80, started in April, expected to still be getting the basics up and running by new year. Finished it in August. “Finished” is a flexible word though. It mutated into a test bench for OS development, where it got as far as “Named storage” ala ‘disk/tape os’ and operating system background tasks ‘designing’. However it got side swiped with too many different architectural changes for things like: “More than 64k physical memory”, “Banking/Paging” and using an FPGA as a “cameleon IO”… implementing SPI, I2C and UART with full Z80 Mode 2 interrupt interface. Eventually that stalled the Z80 project just after getting UART to work with a full 115200 rate using a 16 byte FIFO and proper interrupts.
For storage it got hit with the “you want parallel comms with a modern SDCard or better an MCU, but you are 5V and they are all 3.3V.” So a week was spent drafting level shifters into the new schematic.
The OS development design kept running into… the Z80 has limitations on how far you can go here and if you do move on, you will need to rewrite ALL of it.
So I parked it, took a break and I left a 68000 in a breadboard on the desk to return to, with the datasheet printed out.
These nights I am putting myself to sleep with “step one” and what it will be. So… baby steps. Arduino Mega puppet rig for “practical” and possibly an FPGA Soft core 68000 in simulation as the hardware experimentation setup. I think for the first board it will just be the “core minima”, CPU, ROM, RAM, static addressing, some way to say “Hello world” in LEDs and maybe if it comes easily an LCD status display… anything to avoid the logic analyser.
A few “scoping” factors.
I am developing “headless” display-less computers. Display hardware and gfx is just not in my current interests. To that end the first and most important peripherals are “UARTS”.