Williams System 11 issue

PUTTS5205

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I am trying to use a Pinbot 11a in a High Speed 11. Changing roms didn't do it alone. Is there any jumpers that need to be addressed. Also IJ15 is missing the speaker output pins on the 11a. Any advice on this conversion. Can't seem to find anything.
 
Last edited:
Argh.... I can't remember!

I know this issue has come up before, and it's been covered on RGP a few times too. I'd say give a search over there, and if you can't find anything then also re-post over there. I know there's some oddball things with High Speed being a straight system 11, as opposed to an A, I just can't remember what.

-Hans
 
System 11A: second generation of system 11, part number D-11392. Six
zener diodes ZR3-ZR8 (1N5234 or 1n4735, 6.2 volts) added to the CPU
board for the special solenoid switch input connector. A ground connection
was added to connector 1J18 pins 6,7. The seven segment diagnostic display
was changed to three LEDs. These games used audio board D-11581 which
handles the speech and sound and has it's own sound amplifier. (Exception:
Pinbot used sound board D-11298.) The initial system11 background sound
board was no longer used. Because the new system11a sound board has its
own ampflier, the System11A CPU boards have their speaker connector 1J15
was removed and the CPU sound amplifier U1 is not used (1J15 must be
added back to the CPU board for it to work in earlier system11 games).
Strangely Williams left the unused amplifer in place for system11a (perhaps
to make it backward compatible to system11). The opto switch connector at
1J9 was removed. Jumpers W16, W17 were added to ground pin 38 of the
6802/6808 microprocessor U24. If a Motorola microprocessor is used, W16,
W17 should be connected. If a Hitachi HD680x mpu is installed, jumpers W16
and/or W17 should be removed. Other brands are not affected by this and
work fine with pin 38 tied to ground. Note that W17 is for the speech MPU
chip and W16 for the main MPU chip. Pinbot and Millionaire system11A
games used five score displays (top two were 7-digit alpha-numerics, bottom
two were 7-digit numeric, and one 4-digit numeric credit/ball display) all
combined onto a single circuit board (D-15414 I believe). F-14 and later
system11A games only had four displays (two alpha, two numeric) because
the credit/ball display was dropped. All four displays were mounted on a
single circuit board (D-11609 or D-11610). Game EPROMs used a 27256 at
U27 and a 27128 at U26. The System11a MPU is the most versatile of all
system11 boards. Can be used in all games sys11-sys11c (except for a small
modification needed to use it in the original sys11 games, see below for more
details)


The most flexible CPU board is system11A. The system11A CPU board can be used
in any 1986-1990 sys11, sys11b or sys11c game The only exception is if the
sys11A CPU board is going into a original sys11 game (High Speed, Road Kings, or
Grand Lizard). In this case, connector 1J15 (four pins, .156" molex male header)
must be added to the sys11a CPU board (that's all that needs to be done). To use a
system 11a board in a system 11c game, don't use connectors 1J16 (volume
control) and 1J15 (speakers). Also the sound ROMs at U21/U22 and CPU at U24
and PIA at U9 are not used, since they are moved to the sound board.
The original system11 CPU (as used in High Speed, Grand Lizard, Road Kings) is
also very flexible, after the CPU board is modified slightly. It can work in any
sys11, sys11a, sys11b or sys11c game with these modifications. CPU connector
1J18 pins 6,7 must be run to ground, otherwise the special solenoids will not work
in sys11b and later games. Also there are six 1N5234 or 1N4735 6.2 volt zener
diodes that should be added to the back of the CPU board for the special solenoid
switch inputs. If using a system11 board in a system11c game, just don't use CPU
connectors 1J16 (volume control) and 1J15 (speakers), and the sound ROMs
U21/U22 and 6802/6808 U24 and PIA U9 are not used.
 
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