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View Full Version : Atari 2600 TIA - A 6526?



Thrashbarg
January 7th, 2007, 10:44 PM
I got a dead Atari 2600 Jr board out of the shed just now and compared it to the PAL schematics on the net. They say the TIA (Television Interface Adapter) is a custom chip. My Atari has a boring old 6526 CIA on it, like the ones used in C64's.

I think...

Is it just a coincidence the part number is the same or is it really a 6526? Being able to generate colour video signals with a 6526 would be fun.

Thanks.

atarimuseum
January 25th, 2007, 12:46 PM
The 2600 is made up of 3 chips:

6507 CPU
TIA
RIOT (generally a 6521 or like)


So the 6526 is a variant of the VIA (Versital Interface Adapter) used is ever Atari 8bit computer, 2600, 5200 and 7800 game systems by Atari as well as the C64's


Curt

carlsson
January 26th, 2007, 04:37 AM
Yes, VIA = 6522, CIA = 6526 (later semi-compatible with 8520 IIRC). The 6522 is found in many early Commodore products (PET, VIC, floppy drives etc). If someone had installed a CIA in place of a TIA, no wonder if the video game doesn't work. :-P