[Coco] CoCoFEST! Preparations

[William Astle]

On 2017-04-09 05:26 PM, Melanie and John Mark Mobley wrote:
> I got it to run but the USB to RS-232 serial converting I am using has 9
> indicator LEDs.  One for each signal, including GND (ground).  As DKREMIX is
> running and playing audio the RXD (Receive Data) LED is flashing in step
> with the audio.  This does not hurt anything.  I know there is an 8-bit port
> with 6-bit going to the Digital to Analog Converter (DAC) for audio and
> 2-bits going to the bit banger serial port.  I guess the 2 serial bits are
> not getting masked out.  I guess I am thinking that this should be an input
> so why am I getting output?

Actually, bit 0 of the port has nothing to do with serial (it's the tape 
input). Bit 1 actually is the serial output. That's why you're getting 
output when the sound is playing. It means that the sound being output 
is not making sure bit 1 is set or changing the PIA to make bit 1 an 
input first.