Add support for enable TG43 signal from track 60 on read to en PCF#590
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…nable postcompensation filter
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I didn't want to change the option name, just for don't have a lot of different option names even if gen-tg43 isn't the best name for it |
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Add support for enable TG43 (pin 2) signal from track 60 on read to enable post compensation filter
Some drives like,but not only, BASF 6104 has a PCF that has a better filter for reading 8 inch floppies that hasn't been written with TG43. Normally PC controllers doesn't assert the TG43 signal and this make it possible to read those discs.
Could also be needed in other cases
Reference http://www.bitsavers.org/pdf/basf/80307-048-BASF-6104-technical-manual.pdf page 34
"Read operation
Low input switches the postcompensation filter (PCF) into the
read chain when installed. It is
recommended to activate the PCF
from CYL 60 to CYL 76. The LO I/-
signal has no effect during read
operation on a drive without PCF. "