marks@mgse.UUCP (Mark Seiffert) (05/28/90)
In article <18448@orstcs.CS.ORST.EDU>, cowgilc@prism.cs.orst.edu (Clayton Cowgill) writes: |In article <1783@mindlink.UUCP>a344@mindlink.UUCP (Tom Klok) writes: |>>bartle@psuvax1.cs.psu.edu writes: |>> |>> Is there anyone out there that can comment on how to create EPROMs for |>>use in an atari VCS? I am assuming I'll need an EPROM burner, and info on |>>the assembly language used, as well as hardware info. |> |>The VCS used a 6507 CPU, which is basically a 6502 with a shortened address |>space (8k instead of 64k) and a smaller package. I haven't met anyone who's |>written for the VCS, but I understand that it can be quite a trick. There is |>no screen ram in the normal sense. All graphics are accomplished by writing to |>the graphics chip on the fly. Still interested? :) |> |>If you are, try to get you hands on the Atari Field Service Manual for the VCS. |>It has schematics, and schematics should give you pretty much what you need to |>know about addressing the hardware. An in-circuit EPROM emulator would also be |>a good idea, as I bet you'll be doing a lot of debugging. |> |>What's the project you have in mind? |> |>Tom Klok uunet!van-bc!rsoft!mindlink!tom_klok |>Computers for people. /|\ a344@mindlink.UUCP | |Howdy, I don't usually read this group but today I did and I may be of help! | |In short I designed/built my own 2600 development system (around a 1040ST). |It uses 8K of RAM (Maximum of 4K for cart code... No provisions for bank |switching), or an 8K EEPROM. Graphics editing and disassembly is done on the |ST (a friend of mine wrote a 6502 assembler which I need to add in). | |I just recently got the Developers Documentation for the VCS so I haven't |tried to program anything... yet. It looks like a real pain actually. | |If anyone wants to chat about VCS stuff, send me E-mail at: | | cowgilc@prism.cs.orst.edu Where did you get the VCS Dev Docs from? During the first few months of 1989 three or four messages were posted to alt.sources concerning programming one of the Atari game systems. I was trying to retrieve them to repost when my machine crashed. The machine is still trashed, but if you are interested in getting copies of these messages send a message to me, by replying to this message, with a Subject of "ATARI" and i will send them to you when i dig them off of the tapes. -- Mark Seiffert, Metairie, LA. uucp: rex.cs.tulane.edu!mgse!marks or rex!mgse!marks bitnet: marks%mgse@REX.CS.TULANE.EDU internet: marks%mgse@rex.cs.tulane.edu