PC Ephemera

[Chuck Guzis]

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