Not Booting OS/8

Brian L. Stuart blstuart at bellsouth.net
Tue Aug 8 16:01:42 CDT 2017


On Tue, 8/8/17, Rod Smallwood via cctalk <cctalk at classiccmp.org> wrote:

>          Well not surprisingly it didn't. I keyed in the bootstrap and 
>
> So next move will be to try and see if we can read / write the registers 
> on the controller card.
> 
> First find out what address they are at.

Unlike the 11s, the device registers on an 8 aren't memory
mapped.  The controller effectively adds instructions to the
repetoire.  Doug Jones' site has a good summary of the RX8
functionality:

http://homepage.divms.uiowa.edu/~jones/pdp8/man/rx01.html

BLS


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