How to program the Mockingboard and Phasor?

3 replies [Last post]
cbmeeks's picture
Joined: Jan 17 2005
Posts: 56

Hello all.

I am looking to design a Mockingboard clone. I've built one using legacy parts on a breadboard and connected it to my IIe.

All of the designs I see use an inverter on pin A7 (IIRC). This inverter selects either AY-3-8912 (two of them).

But it looks like the Phasor had FOUR AY chips. But I can't seem to find any schematics on how the Phasor was built.

My idea is to build a soundcard that is Mockingboard compatible but also have support for multiple sound chips. In fact, the microcontroller I plan to use (Propeller by Parallax) has perfect AY-3-8910 emulation (and others). So I'm thinking I could get 4-6 AY chips on one board.

But I'd like to be as compatible with legacy software as possible.

Any information on programming the Phasor schematics, programming it, etc?

Oh, I do have the official Phasor manual but it doesn't help with the design.


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speedyG's picture
Joined: Nov 16 2011
Posts: 2426
Re: How to program the Mockingboard and Phasor?

hello cbmeeks,

AE never published any kind of shematics of any card from AE.
For the Mocking board there are images of the developement disks containing
open code for programming of the Mockingboard ( including examples ).
Some disks for the Phasor contain readable code for the card.

besides just a remark to similar development:

sincerely speedyG


In early days I had a lot of money but no time - now I have no money but a lot of time....
the second part includes less friends but a lot more joy on life....

Joined: May 27 2013
Posts: 797
Re: How to program the Mockingboard and Phasor?

The manual for the Phasor has some programming ideas for third party people.

gsmcten's picture
Joined: Oct 4 2005
Posts: 2631
Re: How to program the Mockingboard and Phasor?


I have a PDF copy of the AE Phasor Manual.
Please PM me with your email address and
I will shoot you a file copy.

Steven Smile


Steven (gsmcten)

"Apple ][.....It's ALIVE!!!!!"