Re: ALF card 5-1-17A: please help identify

[Phil Tubb <googleplus@w127.com>]

On Thursday, May 10, 2012 12:48:40 PM UTC-7, Antoine Vignau wrote:
> Hello There,
> 
> Can you please help me in identifying the following card from ALF
> 
> Products, the maker of the Music II and Music Synthesizer cards?
> 
> 
> 
> Front view: https://picasaweb.google.com/104707687928913128396/AppleIIALFProducts#5740992488873821282
> 
> Rear view: https://picasaweb.google.com/104707687928913128396/AppleIIALFProducts#5740992495771599250
> 
> 
> 
> It looks simple, connects to the I/O port of an Apple II but, you
> 
> know, my HW knowledge is very limited ;-)
> 
> 
> 
> Thank you for your help,
> 
> Antoine

That is a "Timing Mode Input Board".  It plugs into any slot in the Apple II and the cable connects to the "Access Socket" on the 3-channel synthesizer card (originally "Apple Music Synthesizer" later "Music Card MC16").  The "Access Socket" would be the empty DIP socket at the upper right of the card (the card marked 5-1-16A on the circuit side).  It allows one channel of the synthesizer to be used to control the song playback speed (tempo), instead of using the Apple II's game paddle (which is actually a variable timer).

Phil