Hi There, that is actually covox speech thing (poor man DAC), I remember this very well since I made a few, even simpler version with just 10 resistors :) Covox Voice master is ADC and connects to joystick port so it would be 4 or 5 bit ADC https://www.youtube.com/watch?v=d-BBxu3GIxE I kind a belive that atari, apple and c64 are same devices: http://mirrors.apple2.org.za/Apple II Documentation Project/Peripherals/Audio/Covox Voice Master/Photos/Covox Voice Master - Box.jpg http://www.vgmpf.com/Wiki/index.php?title=File:Covox_Voice_Master.jpg http://www.thepyro.com/blog/covox-voice-master/ http://apple2online.com/web_documents/covox_voice_master_users_manual.pdf http://www.downloads.reactivemicro.com/Public/Apple II Items/Documentation/Manuals/Voice Master/Covox Voice Harp Users Manual.pdf PC versions was different so ISA coould be 8 bit ADC http://nerdlypleasures.blogspot.rs/2014/09/the-mysterious-covox-pc-sound-devices.html Regards, Zoran On 10/10/2016 10:18 PM, groepaz@gmx.net wrote: > There: > > http://kb.gr8bit.ru/KB0010/covox-circuit-diagram-643x277.png > > just put it on D0-D7 at the user port and you get a C64 covox. its a really > really simple device, which was kinda common in the early PC days as a poor > mans solution to digital sound output. > > > On Monday 10 October 2016, 20:42:19 smf <smf@null.net> wrote: >> DAC is Digital to Analogue Convertor. >> >> The output of an 8 bit DAC will be something like (vref * value) / 256. >> >> You can build a dac out of resistors and amps or you can buy one. >> >> The covox schematics are probably available on-line somewhere. >> >> On 10/10/2016 19:01, Terry Raymond wrote: >>> I did a little googling and found all 8-bit platforms supported >>> all I could find is thus device uses an 8-bit DAC. >>> >>> Does DAC stand for: Digital Audio Converter, which it seems this is a >>> small IC? >>> >>> Any ideas of possibly making such a device, circuit, all other needed >>> components? >>> >>> Terry Raymond >> Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2016-10-10 22:00:21
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