glitch
Veteran Member
Does anyone have a monitor that works with the Vector Graphic ZCB, using the built-in serial port as the console? I'm working on repairing a ZCB, and I'm pretty sure it's working, but that the PROM in the PROM 0 socket isn't the right one.
I've got the ZCB's power-on-jump function disabled, and have a Dajen SCI loading its monitor from there. I can dump the contents of the PROM 0 slot at E000. I can also initialize the 8251 UART and push characters out from the SCI monitor. So I'm pretty confident the ZCB is up and running.
If you either enable power-on-jump or use the SCI monitor to jump into E000, the ROM currently in the board writes some data to ports 02 and 03, which aren't the correct ports for the ZCB's UART -- it lives on ports 04 and 05. As such, I'm pretty sure it's the wrong monitor PROM. Does anyone have an image of either a prebuilt-compatible monitor, or one that can be altered to talk to an 8251 on ports 04 and 05?
I've got the ZCB's power-on-jump function disabled, and have a Dajen SCI loading its monitor from there. I can dump the contents of the PROM 0 slot at E000. I can also initialize the 8251 UART and push characters out from the SCI monitor. So I'm pretty confident the ZCB is up and running.
If you either enable power-on-jump or use the SCI monitor to jump into E000, the ROM currently in the board writes some data to ports 02 and 03, which aren't the correct ports for the ZCB's UART -- it lives on ports 04 and 05. As such, I'm pretty sure it's the wrong monitor PROM. Does anyone have an image of either a prebuilt-compatible monitor, or one that can be altered to talk to an 8251 on ports 04 and 05?