manu0x0 Posted December 3, 2003 Share Posted December 3, 2003 Hi Everybody... I have some questions (technical ones) about the TIA chip of the Atari 2600. Hope someone will help me... There is a difference in the pinout of both versions (NTSC and PAL) of the TIA. Attached to this message are the pinouts: TIA-NTSC.png TIA-PAL.png During my investigations I found discrepancies in the pinout assignements of the CS0, CS1, CS2 and CS3 lines. The questions are: 1. what are those CSx lines for ? 2. Are the assignements in the attached files correct? 3. Why CS0,CS1 and CS3 are low bit enable and not CS2? 4. What is the !BLK line for? 5. What are the PAL-I and PAL-S lines for in the PAL version? 6. Does any one has a Field Service manual for the Atari 2600? Thanks for any reply and any help... Emmanuel. Quote Link to comment Share on other sites More sharing options...
highinfidelity Posted December 4, 2003 Share Posted December 4, 2003 Shouldn't this be posted in the "hardware" forum??? Quote Link to comment Share on other sites More sharing options...
Vigo Posted December 4, 2003 Share Posted December 4, 2003 Hi Everybody... 1. what are those CSx lines for ? These are chip selects. When CS0,CS1,CS3 are low and CS2 high, the TIA responds to writes/reads from he 6507. 2. Are the assignements in the attached files correct? Didnt find any mistake. 3. Why CS0,CS1 and CS3 are low bit enable and not CS2? To make the address decoding easier. 4. What is the !BLK line for? It goes low when the TIA is in horizontal/vertical blank state. 5. What are the PAL-I and PAL-S lines for in the PAL version? To connect a PAL 4.43Mhz crystal for colour generation. 6. Does any one has a Field Service manual for the Atari 2600? I dunno! Thanks for any reply and any help... No problem Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.