using mpu-b-rom.hex instead of mpu-a-rom.hex

[ronaldlw]

When I change the [MEMORY 1] section of the system.conf file to use mpu-b-rom.hex instead of mpu-a-rom.hex seems to just result in a non-bootable system. Are there some other setting changes required to get the -b- rom to work?

[omiq]

Same, I am on latest firmware and my CRT/VIO doesn't work, changing A to B from makes it not work from TTY either. Everything I find online is for the old configuration approach, nothing seems to show how to do it now unfortunately

[omiq]

Solution: Make sure you are using memory map 2

https://thehighnibble.com/imsai8080/configure/#startup-configuration-non-volatile-storage-nvs

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My machine is set in the boot configuration to load CP/M from disk A, I am guessing we need to set the boot to also have:

8-10	NVS_MEMORY_MAP	-M	Set memory map, 0 = default 64K RAM, 1-7 = use memory map n -M n
11	NVS_BANK_ROM	-R	Enable MPU-B(A) style Banked ROM/RAM functionality, 1 = -r. Only compatible with MPU-A ROM images.

Although mine is already in banked configuration so I don't know

Edit: Oh, can see in screenshot I need to use memory map 2 which loads in the hex for the crt, setting the boot option to memory map 2 worked

[ronaldlw]

@omiq thanks for your response, I'm actually trying to use the mpu-b-rom.hex rom, not the vio rom, but thanks for trying to help!

[omiq]

@omiq thanks for your response, I'm actually trying to use the mpu-b-rom.hex rom, not the vio rom, but thanks for trying to help!

I think it is the same root cause, you can't change it in the config without enabling it in the bootup memory bank setting?

[ronaldlw]

Right, but I'm modifying the same config that i've been using (the [memory 1] one) Which already has the banked ram enabled, so I shouldn't have to switch it in the nvram.

I'm wondering if the power on jump address is different or something, looking into that now.