12 Jan
2012
12 Jan
'12
8:03 p.m.
The 12/7 uses a Z80 processor with 2 Z80-DMA chips,
one ot read in
characters from the host, the other to send them to the printhead
ciruirry. I nthe 700, the DMA chips are effecively each replaced by a Z8.
In both cases there's a correction PROM fro the printhead chracteristics
to correct the pin fire timin, programemd for that particular printhead.
Yes, they're that precise.
I wonder how they measured the printhead
characteristics for the
correction PROM.
Did you have to replace that PROM if you changed the carriage motor, for
example?
/Jonas