26 Oct
2005
26 Oct
'05
7:56 p.m.
On 10/26/2005 at 9:18 PM Jim Leonard wrote:
Where can I find programming information on the
cassette interface?
low-level
info?
A bit more--the 8253 timer 2 is set to operate in mode 3 (square wave) and
used to generate either 1 ms (a "1" bit) or 0.5 ms (a "0" bit)
Data from the cassette is read at I/O address 0x62 bit 4. address 0x61 bit
3 controls the motor.
Cassette I/O routines start at F000:F859
That should give you the whole picture.
Cheers,
Chuck