Sinclair ZX80 / ZX81 / Z88 Forums

A Chip Under Test might still be possible.....I will wait! A push button switch and maybe two toggle switches.

(first email reply) John, What kind of 80's Frankencomputer are you trying to build here? :) It's been a while since I've played around with that chip, so I was a little slow to reply since I wanted to refresh my memory. I have all the docs from Commodore on that chip if you want it. I can scan it f...

Ha Ha! Yea! I figured that much out. I was hoping I could test a SID sitting in a Proto Board. A simple Dead or Alive test. Now it seems it needs it's registers loaded in a certain sequence just to make it BEEP. The chart in the data sheet would be great if they had just added an example. They do sh...

Well first off I am going to be using a ZX81 with three 8 output buffers. Using Pokes I can change the SID's addresses, Data and controls. I know about all the test programs for a 64. I am looking for an example of the steps data goes into the SID. Something like. With the Addresses set at 00000 mak...

Not much I can do with a SID on a proto board. I was hoping to get it to buzz, beep or hiss! Without knowing if my chips are good I would only be chasing my tail! I was hoping one of the guys I emailed would say something like hit the data lines with 00000001 then 10000001 and then 11100000. I bumpe...

The RESET and /CS switch did nothing! Off to do more reading!

I love this stuff to a certain point. I got the SID on one proto board with all it's requirements met with jumpers but no sound. Today after a long walk I will add two push button switchs. One so I can do a RESET and one that hooks to /CS. With the Addresses wired to 00000 and Data wired I should ge...

1024Mak Yes I am going to use the three 74LS373 LATCHes wired on the first proto board that drove my Christmas light project. Latch 1 will do address and latch two will do Data. It looks like three will have to do the /CS as a strobe. I was hoping just and address and data would do the trick. I can ...

I found a guy that is driving one off a parallel port.

http://www.loper-os.org/vintage/paralle ... rasid.html

There always seems to be a trick! I got that data sheet. I found this guys info!

http://www.mikekohn.net/micro/sid_player.php

I think the CS signal is the Key!

After the BBUM project I started collecting parts. I got two SID chips out of broken 64 computers. I won an auction for a bigger proto board with built in supplies. Now I got the SID mounted in the new proto board along with a LM386 audio chip. The audio chip is working but the SID is giving me hear...