Re: Sega Space Ship pinout (Space Wars Clone)

Fabrice,

Thanks for the info (pinout).

Just wondering, where does the "reset" signal (pin 21) terminate on the
board (i.e. chip & pin)?

To answer your questions:

The "EXTERNAL_HIGH" input is part of the JMI (Jump on MInus) option. On the
Cine CCPU, a jumper can be added to allow a jump instruction to be
conditional on the minus flag (sign bit (#11) of the active accumulator).
Most games use this mode. Do you have a physical jumper attached to this
net, somewhere on your board?

In one game (Tail Gunner), they used the CCPU's external input to implement
a Successive Approximation ADC. The ADC was divided across the CCPU, the
sound board and even the monitor. The monitor's X axis DAC was used (in its
spare time) to produce a voltage under control of the CCPU, which was fed to
a comparator on the sound board, which compared the voltage from the DAC
with the voltage from one axis on a joystick. The result was fed back to the
CCPU. Then by successively (hence the name) varying the DAC's output, they
could determine the position of the joystick.

O7 is what today would be called a GPIO and was fed to the sound board to
control whatever effect the game designer wanted. In Space Wars it's not
used.

I'm not sure anyone can tell you if 400ns RAM chips will work in a CCPU. The
majority of devices used were 200ns. I have seen a limited number of 300ns
chips, but never any 400ns chips. So, you'll have to let us know!

Keep up the good work.

Thanks,
-Mark

On Sun, Jan 17, 2010 at 6:46 PM, Fabrice GIRARDOT <f4brice@gmail.com> wrote:

>
> Hi all.
>
> I finished to create the SEGA Space Ship pinout file.
>
> I know it's usually a bad idea to attach a file to
> a mail sent to a mailing-list.
> But doing a copy-paste here would not make the e-mail
> smaller in size and would also perhaps break lines.
>
> There are 1 input and 1 output that are unknown to me :
> input A8 pin 8 (EXTERNAL_HIGH)
> output F2 pin 12 (O7)
>
> I'm still working in repairing my PCB.
> I already changed N2 and T2 who were bad for sure.
> Now, I think at least 1 memory chip is bad since
> I have strange output.
> Both pictures are RAM at L14, pin 16 :
> http://img1.uplood.fr/free/leol_broche_16_1us.png
> http://img1.uplood.fr/free/s05q_broche_16_500ns.png
> It is not a DSO hallucination (also tested at faster speed).
> When I exchange 2 memory chips, I do NOT have the same
> signals.
>
> I'm gonna buy replacement chips.
> I only found 400 ns chips, and SEGA's chips are 200 ns.
> Can anybody tell me if 400 ns memory chips would be
> fast enough for the CCPU ?
>
> Also I took some pictures of the SEGA Space Ship cabinet
> control panel. Pictures are posted here:
> http://www.gamoover.net/Forums/index.php?topic=20677.msg299603#msg299603
>
> If somebody wants more pictures, please let me know.
> I'll send some good pictures to klov, since there's none for this game.
>
>
> Regards.
>
> --
> Fabrice
>
> Space Ship
> SEGA, 1978
>
> PCB is a CCPU (Cinematronic CPU).
> It has 6 PROMs with CCPU micro-code and 8 PROMs with game code & data.
> Game is Cinematronic's Space Wars.
>
> Parts side | Solder side
> -----------------------------------------------------------------------
> pinout by F4b GND | 1 | A | GND
> v1.0 GND | 2 | B | GND
> GND | 3 | C | GND
> +5V | 4 | D | +5V
> +5V | 5 | E | +5V
> (used by audio only) +25V | 6 | F | +25V (used by audio only)
> (used by audio only) -25V | 7 | H | -25V (used by audio only)
> coin meter out | 8 | J |
> speaker + | 9 | K | speaker +
> | 10 | L | EXTERNAL_HIGH [A8 pin 8]
> out7 [F2 pin 12] | 11 | M |
> coin SW, NO | 12 | N | coin SW, NC
> player 1, forward | 13 | P | coin SW, common (=GND)
> player 1, right | 14 | R | player 2, left
> player 1, left | 15 | S | player 2, right
> keypad SW 5 | 16 | T | player 2, forward
> keypad SW 1 | 17 | U | keypad SW 0
> keypad SW 2 | 18 | V | keypad SW 6
> keypad SW 3 | 19 | W | keypad SW 7
> keypad SW 4 | 20 | X | keypad SW 8
> reset SW | 21 | Y | keypad SW 9
> player 1, hyperspace | 22 | Z | player 2, fire
> player 2, hyperspace | 23 | a | player 1, fire
> GND | 24 | b | GND
> GND | 25 | c | GND
> INTENSIFY [J2 pin 3] | 26 | d |
> (LSB) Y0 | 27 | e | BRIGHT [J2 pin 11]
> Y2 | 28 | f | Y1
> Y4 | 29 | h | Y3
> Y6 | 30 | j | Y5
> Y8 | 31 | k | Y7
> Y10 | 32 | l | Y9
> INITIAL_POSITION [H8 pin 13] | 33 | m | Y11(MSB)
> (LSB) X0 | 34 | n | LINE_DRAWING [I8 pin 2]
> X2 | 35 | p | X1
> X4 | 36 | r | X3
> X6 | 37 | s | X5
> X8 | 38 | t | X7
> X10 | 39 | u | X9
> | 40 | v | X11 (MSB)
>
> Notes:
> o) letters "G", "I", "O", "Q", "g", "i", "o" and "q" are not used as pin
> reference.
> o) speaker is 8 ohms 10 W ; pin "-" is connected to GND
> o) 2nd coin meter pin is connected to +25V
>
>

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Received on Tue Jan 26 20:52:42 2010