Help with a busted MSV11-L?

Johnny Billquist bqt at
Tue Dec 9 09:49:04 CST 2014

On 2014-12-09 16:42, Noel Chiappa wrote:
>      > From: Johnny Billquist
>      > If the MMU is off, you can consider the PAR registers as just plain ram.
> Ooooh, very clever! Wouldn't work on a /40, of course, but on a /23 with
> 22-bit addressing, they are full width! Thanks for the tip!

Oops. Good point. Didn't think of those 18-bit addressing machines... :-)

I actually picked this trick up from a maintenance manual for the 11/70, 
where they have various small test programs you can enter, which tests 
tricky parts. They all use the PAR addresses for the code.


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