[sdiy] Parallel 8 Bit DACS?

[Jack Jackson]

To my answer my own question, the DAC0800 was used in the rare Solton Programmer 24:

http://soundsofthedot.com/images/Programmer-24_Schematics.jpg/page-4.jpg

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> From: jackdamery at hotmail.co.uk
> To: synth-diy at dropmix.xs4all.nl
> Date: Wed, 20 Nov 2013 13:35:45 +0000
> Subject: [sdiy] Parallel 8 Bit DACS?
>
> I'm investigating the world of drum machines and EPROMs. I quite like the idea of a DAC with parallel inputs and +/- output as per the DAC0800. I can't find any implementations of it though, apart from the datasheet. First question:- Is there a similar DAC that might better suit this purpose?
>
> As far I understand it, a fairly standard implementation for a drum machine would be an oscillator driving a parallel-out binary counter fed into an EPROMs address inputs with the EPROMs outputs fed into the the DACs parallel inputs. Like so:
>
> Oscillator -> Binary counter -> EPROM -> DAC
>
> Second question, in terms of EPROMs I believe it would be easier to use a Flash EPROM, which is electrically erased and programmed (as explained on this page: http://www.arlabs.com/help.htm ). Could one use a PIC style programmer to programme these? The Linn drum .bin files I found online seem to contain HEX code as you would programme a PIC IC with.
>
> Last question: Is there any magic to using this topology, and also analogue VCA and filtering, over using samples of original drum machines?
>
> Best Regards,
> Jack
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