Interface card inside keyboard

Component side of keyboard card.


Fairchild  9311DM

4-to-16 decoder


DM74367N

DM74367N

hex buss driver


D16H-12-103J

resistor pak

Solder side of keyboard card

Apple II buss interface card


Component side

74LS00

74LS368A

74LS368A








Solder side


Pins 18-25 of the DB25 are all grounded.

What’s needed to make an alphaSyntauri


Keyboard, 4 or 5 octaves with 25-conductor ribbon cable to Apple II.

(Not a serial or null modem cable.)


Apple II buss interface card. Plugs into Apple II slot, with DB25 connector for keyboard cable.


Mountain Computer Music System cards,

2 cards connected by flex cable. May not work in an Apple IIe.


Apple II or Apple II Plus with floppy drives.


alphaSyntauri software and manuals.

Alpha Plus, Metatrak, Simply Music, Wave Editor, etc.