Subj : Play audio from a serial port
To   : Spectre
From : Bob Worm
Date : Mon May 27 2024 07:46:05

  Re: Play audio from a serial port
  By: Spectre to AKAcastor on Mon May 27 2024 20:57:00

Hi, Spec.

 > Ponder a lot of parallel ports were not bi-directional. Meaning you'd have
 > to use a control line for detection, not a data line, and or  the detection
 > is only transient. Mind you I don't know if there were any port requirements
 > for DSS or Covox.

I just found a guide to interfacing the DSS on archive.org, it appears to just use control lines:

Select (PC->DSS): set and held high for DSS to power on, momentarily strobed low to latch data into the FIFO. The example code does a stack push / pop to introduce enough delay for the strobe to work, possibly that wouldn't be enough time on modern processors.

Ack: (DSS->PC): used to indicate whether the FIFO is full... though I don't entirely see the point in this as their example code just discards the current sample when the FIFO is full, which I guess is what a full FIFO would do anyway

Possibly the ack also lets the PC "see" that there's a DSS connected? Dunno.

Doesn't seem too complicated anyway :)

BobW
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