29 Nov
2006
29 Nov
'06
3:17 p.m.
However, whether all this 'counts' or not is
debatable; Acorn didn't (sadly)
forsee people wanting to have more than one 'secondary' CPU attached at any
one time, so the connection between the BBC side and any additional CPU was
really point-to-point only rather than a true bus; I think Torch were the only
I thought at least one of the Torch second processors, probably the
'Graduate' (8088-based MS-DOS one) connected to the 1MHz bus not to the
Tube. IIRC, it made use of a feature of the BBC micro which causes the
latter to boot from an area of ROM in the FDxx space if one of the
interrupt lines is asserted during/just after a reset.
In which case you should eb able to link up a normal Tube-connected
second processor too.
Writing the necessary software is left as an exercise for the reader ;-)
-tony