Phoenix crashes when screen flipped for player 2

Skeet

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Hi,
Does anyone know which IC/ ICs are responsible for flipping the video upside down for player 2 in cocktail mode on a phoenix board.
My Phoenix board restarts when it is about to flip the screen. I've checked the DIP switchs and their associated logic ( IC1 (74LS245) and IC3 (74LS244), but struggling to locate where the fault is as it only occurs on attempting to flip the video.
The logic from the above ICs goes to the CPU address lines then data out to several video associated ICs, but where is the flip done?
Any help would be appreciated.
 
Great game, way way underatted. Not sure if Phoenix was ever designed to play on a cocktail? :hmmmm2: :confused2: I will never forget the sounds on that game.
Iconic
Beethoven, ingenious
😁
 
Last edited:
There's a DIP-switch for cocktail-mode. ;)

Define "crashes".
If the CPU crashes, check the content of the ROMs for flipped bits.
 
You were spot on Phil. Unfortunately the test ROM wouldn't work. It locked up half way through it's test every time. But replacing all 2114s with good ones from a working Phoenix board solved the problem.
I then put the old ones in one by one and of course the last one (IC 44) was the culprit!

Just to note. At first I replaced all the 2114 RAMs with some new 2114s I had in stock and the game was even worse - messed up graphics and gameplay.
They were the slower 2114 L series. This board needs 2114-15s or 2114-3s to work properly.
Many thanks.
 
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