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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