Sound/Beeper Software / Hardware acces on HP48

[TomC]

Does anyone have experience directly accessing the 'Beeper' output on the Saturn processor in the HP48.

I realize that this is a single pin and not a conventional DAC (Digital to Analog Convertor) as one might like/expect.

There have been some interesting examples in the (distant!?) past....in particular a couple that come to mind were named something like 'TV' and 'Television' as found in hpcalc.org and the fine Horn disks. The aforementioned apps obviously directly accessed the beeper - producing a convincing static, relatively wide audio bandwidth.

I've studied all of the available hardware/assembly documents on the HP48, and I find no reference to beeper/sound functionality.

Any helpful recommendations are greatly appreciated,
TomC