<and transister( 18n9 ) from rectifier bridge. The soldering job on MP-A2
<has alot of resin around connnections that I'm already pretty leary of. Il
<start off by digging for all the hardware documentationI can find...
Wash with alcohol, then put in dish washer to clean up the boards.
The bulk of the SWTP hardware was hand assembled so removing the resion was
often not done.
<First question: The baud lines on both busses (110,150,300,600,1200) caug
<my eye and that ad above states: "Crystal controlled oscillator( 1,7971 )
<provides the clock signal for the processor (before?) and is divided down b
<the MC14411 (both on MP-A2 GK) to provide the various baud rate outputs fo
<the interface circuts. Full buffering on all data and address busses..."
<Does that mean that all these cards are serial?
No! They had a common baud rate generation to avoid repeating a circut that
generally appears on every serial card. It was one way to reduce the cost
by elimintaing redundant circutry. the transfers were via 8bit dat and
16bit address plus a hand ful of control lines. It was compact hence the
name SS50 for the bus.
Allison
Received on Sun Mar 21 1999 - 08:38:08 GMT