[Coco] Full Midi Synthesizer on a CoCo

[Camillus Blockx]

Hi, Nick,



If you look at the datasheet, and the application with the DAC is pretty much what you need. The problem is to get this in a coco cartridge, that is not so much the cartridge but the signals that are needed. The only signal that needs to come from the coco is the  RS232 or serial port, besides of course the power( needs an 5 to 3v3 converter too, because only the digital inputs are 5V compliant, not the power for the chip ( max 4.3 V). The problem is that the serial output of the coco comes from one of the pia's. This signal is only availlable at the serial din jack. To get that signal on the cartridge port you have to hard wire from the PIA serial out Pin to a pad on the coco expansion connector that is normaly not used or completely create a new serial port with another pia or uart on you cartridge board. Also the address of this port would be different so that all the midi programs need to be patched to that address. 

If I where you, I would consider 2 Options:

1.  Put the circuit in a box, with midi in, midi out, midi true, the circuit from the AN ( datasheet ) and a good power supply.

2. Integrate this circuit into an exsisting RS232 controller, with a switch that sets it for use the RS232 serial port  or MIDI port.

A pcb for this is not so hard to develop.


Do you have this chip allready or do you still need it to buy? What is the price, and where you buy it from?

Hope this helps your project, if you are a MIDI geek ( freek ) just  go for it. All you can loose is the time, the money you spend you would spend on soemthing else anyway...LOL ( Only if the chip cost not too much, lets say not more then $10.) 


cb
On 2/2/2015 8:47:29 PM, nickma2 at optusnet.com.au <nickma2 at optusnet.com.au> wrote:
Who wants to design/build a midi syntherizer cartridge for the CoCo
based on this chip?

http://pdf.datasheetcatalog.com/datasheets2/42/424233_1.pdf

Nick

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