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Date: March 22, 1989 15:54
From: GAWD::RAY
To: @SYS$MAIL:HARDWARE,RAY
Hardware Meeting 3/21/89 J.Ray 3/22/89 Attendees: Mike Albaugh, Chris Downend, Tim Hubberstey, Pat McCarthy, Glenn McNamara, Rich Moore, John Ray, Byron Sheppard, Doug Snyder, Gary Stempler. Byron Sheppard was introduced as a new hardware engineer in Brad Fuller's audio group. Welcome Byron! The latest 1 Meg EPROM info from TI is: They are not in production yet. Parts will be available in the summer for $18-20. They will not be cost-effective for us until early 1990 when they should cost about $14. Pat McCarthy reported that he is 90% done with the schematic. He will be implementing most of the chip in TTL to keep the Thunderjaws project progressing. The expected size of the chip is 3000 gates. He is hoping to get the Priority and Shifter chips done for Tjaws as well, but is not sure yet if this is possible. Doug and Mike reported that they will probably be visiting Mississippi next week to check on the design of the ASAP chip. Proto chips are expected late May or June. The first two boards for the development system (Mother and 68000) should be ready in May. The next two boards will be the RAM board and the Pod board. The Analyzer will be wire-wrapped before it goes to PC. The ASAP development system will be packaged in a "baby AT" case due to its cost-effectiveness and readily available components (eg. power supplies). Mike is working on the software, and will need an AMS for the 68000 development. The ASAP development system software committee has written the first pass report on what they would like to see in the system. Pat will be writing up a purchase req. for Data I/Os ABEL software for the VAX. This will be an upgrade from the PALASM software currently used. Pat will arrange a demo of Viewlogic schematic capture and simulation software for the PC. We then discussed moving towards the JAMMA standard edge connector. Chris gave a synopsis of the reasons Atari needs to move towards this standard: The only games that are selling now are blockbuster games (Hard Drivin') and kits. Upright games in the $2000 price range are just not selling. This change in the market demand requires us to adapt our games to the kit market. The kit market is dominated by the JAMMA standard. JAMMA PROS Increased kit sales Possibly increased whole game sales Economies of harness standardization: Engineering Manufacturing Field service (test fixtures) JAMMA CONS Increased PCB costs Increased connection costs Increased FCC problems Reduced power supply capabilities Inflexible edge connections Reduced audio volumes Changes "Standard Audio" methods (increased engineering) Doug Snyder agreed to coordinate documenting the Atari JAMMA specification. This specification will cover: Edge connector pinouts Video timing, polarity, levels Audio levels Power supply requirements Byron Sheppard agreed to come up with a standard audio amp configuration (for use on JAMMA games) that is cheap and uses readily available components. We discussed monitor usage on JAMMA games. The JAMMA edge connector only provides for -CSYNC. However, Doug said that the kits he has seen also provide taps somewhere on the PCB for separate positive syncs. He suggested we do the same (as a minimum) on our boards (on Tetris, he provided a separate Atari standard monitor header on the PCB). We should also make sure that the monitors we will be using will accept -CSYNC. (Some monitors accept -CSYNC on both -HSYNC and -VSYNC terminals). We should NOT use (on our JAMMA compatible cabinets) monitors that only accept positive sync signals. Regarding current and future games: TETRIS and TETRIS cocktail are both JAMMA compatible. ESCAPE upright will not be a JAMMA cabinet. ESCAPE kit will have an adaptor board and minor mods to the SA audio board to make it JAMMA compatible. SKULL & CROSSBONES main board will be re-designed to incorporate the JAMMA connector. The SA II board (with minor mods) will mount on top of the main board and have connections only to the main board. Games beyond these were not discussed. I would presume that all games currently in development except for S.T.U.N. Runner will be converted to JAMMA. Incorporating the audio board onto the main board should be seriously considered for cost savings (keeping the software drivers as compatible as possible, however). Please let me know if you have any additions or corrections. John
Mar 22, 1989