Pokeys under Limestone

Few people know that there are literally thousands of Pokey Chips stored in a limestone cave somewhere in Kansas City. A liquidation company bought truckloads of mint unopened ATARI carts, and among these is the ATARI 7800 version of Ballblazer.

While I didn't feel like ripping apart a perfectly good mint unopened box, I nevertheless scourged through my cartridge collection and opened mine for fun. The third photo shows the desoldered Pokey chip, under the one I got NOS from a dealer (note the manufacturing dates - 5 years apart).

Next I placed the salvaged '87 pokey on my protoboard and played it the Ballblazer title track through it. Love those fat basses.

NOTE1, The ATARI 400/800 (home computer) has a native pokey chip, and the Ballblazer title sounds exactly (to my ears) as it does on the 7800 Cart, its logical to assume that the LucarFilm Games authors didn't want to alter their composition by only using 7800's native TIA chip... but did it justify adding a chip to the cart which would boost production costs a lot? if someone has some info on this i would be curious to know.

NOTE2, the other 7800 Game cart that contained a Pokey chip is Commando, but its not available in the cave.

That ____ VIC-I Noise Pattern

My VIC emulation just gave me a good scare yesterday as I suddenly realized I might have overlooked a crucial detail. Time to get the offwhite box out again and sniff the audio pin's output for something....

OK! I'm convinced my Emulation was right... oh well... better triple check everything

New Acquisition

Just received my latest toy. A PAL Soundic MPT-03 Console (Clone of an Emerson Arcadia 2001 )

And just inside, a socketed Ceramic Signetics UVI 2637 ... Already got the 9Bit noise pattern from it (and surprise its the SAME as TIA Distortion 8!). But some games generate odd mixed patterns that i'll surely be investigating in the future.

Bug or Feature?

Hi

Just having some fun with my dev build of chipsounds trying out my new Pokey oscillator code. Here we have the eternal programmer question...

Is THIS SOUND a bug or a FEATURE?

Safe to say, chipsounds will contain some extra "note quite accurate" fake-chips in there.

3 Brothers

What do you do when you want to lower your stress level? Solder of course :)

I wanted to free my breadboards and "stabilise" my test suite against hardware, so i spent a few hours doing those two new boards.

Pokey Trials

Here's a photo of my current breadboard for my Pokey. Just missing a clock divider hooked to my 3.57Mhz crystal to get the desired 1.79Mhz. (doing alright with a 2.0 MHz one at the moment for diagnostics).

Pokey is odd, really. and a challenge to integrate in my current Synthesizer code. All bit patterns (or distortions) vary across frequencies and even sometimes retriggering. This seems to be due to the various Pokey internal sub clocks not keeping synch at all time (frequency divider vs 5bit poly vs 4bit poly vs 9/17bit poly).. to make matters worse, there is also various tweaks to the frequency divider (2 channel mode vs 4 channel mode, etc).

Heres a VERY HARSH sound example of 4 different triggerings of a 9bit noise pattern. warning., this is GRITTY! (the last one is more musical, which is interresting)

My goal is to find the best solution to give the user the widest palette of variations and randomness, representative of someone actually programming a song on a a800 (contemporary tracker writers ares still going mad with those sync problems...)

Small update

Sync Buzzer is DONE! ...
Good thing is that new oscillator code opens the door to tons of other cool new sounds... but you will just have to wait until the demos are out!!!