It means if you are using the monitor to load at 0000, you can't, rom is there.
also 0000 is the start address for the eprom so it will bark at you.
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The rom has to be there to run and communicate with the buttons.? Its
why I suggested reading the V15 code to understand what the rom
does and the memory map it expects.
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If you wanted to run code at 0000 for some reason then you need to
put a (new) monitor in high ram then enable the low ram bank. The
code in High ram allows you to talk to the machine rather than crash it.
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The design is such that from 8000h and up is always ram.
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FYI CP/M enables low ram and loads itself in high ram.? Once you get the
startup message you have 64K of ram with CP/M eating about 8k of the
high end of the ram.? It reserves 0-100H as system page and from 100 to?
end of the TPA as program space.? ?The TPS is Transient Program space
and something like 56K.? Asm, DDT, Stat, PIP, and a few other are tools
in the uSD.? That's my normal development environment.
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?
Allison
