PDP-8 CPU question

Ethan Dicks ethan.dicks at gmail.com
Sat Jun 18 11:47:21 CDT 2005


On 6/18/05, Allison <ajp166 at bellatlantic.net> wrote:
> You could but only to the extent that you'd then have to copy to core
> for execution.  ROM on PDP-8 is a tricky thing as subroutine calls
> (JSR instruction) puts the return address at the first word of the
> subroutine.  Hard to do that in ROM {yes DEC did have a rom/ram
> board to fake that.}

I think in this case, the JSR/ROM issue is moot... doesn't the M8317
'toggle' the boot into low core?  I didn't think M8317 PROMs were
memory mapped.

-ethan




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