[GTALUG] ancient computer history

[Stewart Russell]

On Tue, Sep 18, 2018, 10:48 James Knott via talk, <talk at gtalug.org> wrote:

>  I also used to maintain a PDP-8i
> computer.  When browsing through the programming manual, I found DEC
> actually recommending self modifying code, to get around the limitations
> of the instruction set!


The basic PDP-8 didn't have a hardware stack, so you had to prepare
subroutines by modifying the code's return address before you called it.

I'm building a PDP-8 compatible right now, based on the Harris HD-6120
"PDP-8 on a chip" used in the DECMate desktops. I'd best brush up my octal,
as it's a 12-bit machine.

Cheers
 Stewart

>
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