Pinouts for a couple of customs

[channelmaniac]

Hey folks,

Had a bit of a bitch of a Crime City on the bench. Two stuck inputs and a sound subsystem in watchdog. Fixed it, but in the midst of doing that I reversed the pinouts for two of the customs:

TC0220IOC - I/O Controller IC
TC0140SYT - Sound Subsystem Controller IC

The I/O controller handles DIP switch and control switch input, coin lockout and counter outputs, and master /RESET signal for the game.

The Sound Subsystem Controller handles memory decoding, /RESET for the sound subsystem, watchdog for the sound subsystem, and communications between the main and sound CPUs.

 

[kissedin]

You're doing the Lord's work.

 

[twistedsymphony]

this is useful, these chips are used on a quite a few games IIRC

 

[ShootTheCore]

Fantastic!

 

[channelmaniac]

Thanks guys!

I have more out on the PLD Archive.

 

[kissedin]

Is there some explanation somewhere about these pins? Pin 5 and 7 on the tc0220ioc is why i'm asking.

 

[channelmaniac]

These are pins from the PALs to the chip on Crime City. I'm thinking one (pin 5) would be for a /CS (Chip Select) or similar function for accessing the I/O chip as that's an output on the GAL.

Pin 11 is an input so it is possibly an /INT (interrupt) coming from the I/O chip.

I haven't taken any time to do any specific logic analysis and don't really plan to.