[Tech] Space invaders video output

[LukeWells]

[ukvac] [Tech] Space invaders video output
1) I connected a space invaders board to a colour monitor about 3 years ago,
so I know it can be done and I know about connecting all 3 colour inputs to
the BW output with resisitors to get white etc.

What I can't remember is, what is what with the space invaders video
outputs. Does the board output sync or do i need to split out composite
video? My minds gone blank.

So please someone tell me what pin does what on the video output of a Midway
L boardset.

2) Space Invaders deluxe (i.e. the US version of space invaders part II)
Does this one use a black and white monitor? is the board pin compatible
with a part 1 cab? I can't remember if this is one of the Midway sets that
can generate a red screen on collision, and therefore needing a colour
monitor.

I do know that the Space invader deluxe board has one of the data shifter
daughter boards, which afair was used to generate the colour bars on some
boardsets (when they stopped using plastic strips, but still technologically
were not capable of drawing the screen in full colour)

The datashifter is the only reason I suspected red screen capability, as i
know Deluxe is black and white normally.

Thanks in advance

Luke



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[P-Man]

Re: [ukvac] [Tech] Space invaders video output
> So please someone tell me what pin does what on the video output of a
Midway
> L boardset

you have 1 video output, marked 'video'. This is composite video, ie the
picture data and the sync data is all on one wire.. You need to trace it
back, (not far) to find the two resistorsrs attatched to the video output
line. remove the resistors, one of the incoming lines is your video, the
other is the sync, tie the video to the RGB, tie the sync to the sync. et
voila.

> 2) Space Invaders deluxe (i.e. the US version of space invaders part II)
> Does this one use a black and white monitor? is the board pin compatible
> with a part 1 cab? I can't remember if this is one of the Midway sets that
> can generate a red screen on collision, and therefore needing a colour
> monitor

i'm not too hot on midway ... but i was under the impression that midway
never made a space invaders machine with a colour monitor. Taito however,
did.

I'm also not convinced your comment about midway making a pcb that can do
the red screen collision is true. I work with these pcbs day in, day out,a
nd have yet to find one that can. for several reasons :

1) there is no RGB output on the pcb anyway.
2) the red screen colour is merely hooked to the base explosion sound
circuit, and the sum result of it is to switch off the green and blue
transistors, making the screen data entirely red. this is an analogue
circuit, and is devoted to the sound circuit.

you can use a deluxe sound pcb in the place of a regular space invaders, the
connectors are different, however, if you follow the keying, and ignore the
third connector, they still work fine. (the extra connector was for midways
cocktail tables.

> I do know that the Space invader deluxe board has one of the data shifter
> daughter boards, which afair was used to generate the colour bars on some
> boardsets (when they stopped using plastic strips, but still
technologically
> were not capable of drawing the screen in full colour)

nope, the data shifter is for advancing the aliens only, nothing to do with
colour.

I'm almost 100% certain that midway space invader pcbs are incapable of
outputting colour without an impressive hack board.

midway only made l-shape pcbs, taito made l-shape and 3-layer.

an L-shape pcb is incapable of outputting colour , therefore, midway pcbs
cannot output colour.

> The datashifter is the only reason I suspected red screen capability, as i
> know Deluxe is black and white normally

datashifter is just that, nowt to do with colour

> Thanks in advance
>
> Luke

that should clear things up

Andy Welburn
www.andys-arcade.com



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