Midi, serial ports, uart's

[Fraser, Colin J]

> -----Original Message-----
> From: Mikko Helin [mailto:MHELIN at tne01.ntc.nokia.com]
> Sent: 12 October 1998 13:56
> To: synth-diy at mailhost.bpa.nl
> Cc: MHELIN at tne01.ntc.nokia.com
> Subject: RE: Midi, serial ports, uart's
> 
> This sounds like a good PIC project: use a pin on B port to receive
> an interrupt from parallel port, another to select either address
> or data. PIC16F84 has got 64 GP registers, which can be used to
> store the data. When the PIC doesn't handle interrupts it does
> refresh DAC S/H's, there you need another address/data select line
> and write strobe, inverted write strobe writes address to latch,
> non-inverted writes to DAC and enables multiplexer's output to
> s/h stage. Maybe some delay is needed before DAC -> s/h is enabled.
> One or two registers could be used for gate/trigger outputs with
> output latches. Actually DAC doesn't need any write strobe, if it's
> usual multiplying type converter.

Interesting thoughts...
I've done some very limited PIC programming with the 12c508. I'll need to
have a look at the 1684 data sheet and see how similar it is.
I'm not tooled up to write the driver for the PC, but the hardware side
sounds easy.
Anyone else interested in this idea ?

Colin f