Date   : Mon, 29 Aug 1994 09:29:33 GMT
From   : Roy@... (Roy Collett)
Subject: BBC Emulator Keyboard Links

Stephen Quan questions power up polling of the keyboard links
on the BBC.

This may help.

Links

1      40/80 Track select
2      Acorn extended mode (not known what for)

3  4  Disk drive selection
-  -
0  0  Teac drives
0  1  MPI drives
1  0  Tandon/Shugart drives 6 msec.
1  1  Tandon 4 msec.

5     Power up / Break Action
-
0     Auto boot on SHIFT-BREAK
1     Auto boot on BREAK and POWER UP

6  7  8 Mode on Power up / Break
-  -  -
0  0  0 Mode 7
0  0  1 Mode 6
0  1  0 Mode 5
0  1  1 Mode 4
1  0  0 Mode 3
1  0  1 Mode 2
1  1  0 Mode 1
1  1  1 Mode 0

Also would anyone like a breakdown of the low memory MOS vectors,
workspace, variable stores etc. or are these common knowledge?


-- 
Roy Collett  Roy@...             
New Southgate, London, England.