10 Apr
2002
10 Apr
'02
1:50 p.m.
The Philips P850 is not microcoded. All other P800
series machines I've
seen are, but those used either custom Philips bitslice parts (SPALU --
Scratch Pad Arithmetic Logic Unit) or AM2900 series. I believe the P855
was a microcoded TTL design, but I don't have the schematics to check
The P856 and P857 are TTL based, microcoded designs.
Both used 4 74181's ( No 2901's) in their ALU and have around 200 TTL on a
single PCB...
Jos