The more I'm thinking back, I now remember an idea I had for the
original ROM and legacy software. The idea was that the extended 8085
could have a "virtualization" mode where it would configure a given 64K
bank of it's 16M region as "legacy". When it enters "legacy" mode, all
opcodes and addressing behave like a normal 8085 within the configured
64K bank.
Then a context switch timer (not available for access while in "legacy"
mode) would pull the processor out of legacy mode every so often to
perform extended stuff. I don't think I had worked though all the
details of that, but that was the basic idea anyway.
Ken
On 5/2/16 4:26 PM, John R. Hogerhuis wrote:
Oh I know another reason to use special NOPs. NOPs are opcode 00 so
which tends to be a special character. Probably some or all
NOP-alternatives can be embedded directly in BASIC string literals.
And don't think BASIC file I/O can be used for NULs.
So whatever. They are minor edge cases and they could be addressed as
necessary with patches.
-- John.
