Undocumented
instrs are not the whole story, particularly not for 8085
vs z80 issues, and especially not for RIM and SIM. I have had hard times
finding any 8085 system at all that required and used them; the typical
If you are looking for a "desktop/hobbyist" application, that's probably
true. But, SID and SOD were cheap one bit ports that were exploited
in embedded products. Given how few *products* were developed in this
Probaly the most common 'consumer' 8085 system was the TRS-80 Model 100
and related machines. That machine uses SID and SOD (for the casssette
port) and also the RST5.5 (Barcode input), RST6.5 (UART Data received)
and RST7.5 (Real time clock pulse) inputs.
-tony