[Tech] Midway Space Invaders Deluxe Nasty

[LukeWells]

[ukvac] [Tech] Midway Space Invaders Deluxe Nasty
Hi,

Trying to make a Jamma adapter for both SI and SI Deluxe so that I can
repair the load I have on my test bench.

Wired the motherboard ok. Get garbage on the screen (split video and sync
ok)

Sticking a SI deluxe sound board in doesn't make any difference.

Grounded the POW (Pin 6) and the onscreen garbage goes slightly wavy like as
if the monitor needs capping, but doesn't change.

Hmmm, I thought, maybee I need to wire up the sound voltage ... 18volt .....
12volt will do right?

Pin 11 12volt pin 10 gnd ......

noooo ...... horrible sounds coming from the pcb .... <click> ......
hopefully switched it off just in time.

When I wired in the 12volt to the sound board it made an aweful sound (on
the board not the speaker) like a high pitched cracking

I've heard this before, on an Atari pcb, shortly before the coin counter
transistor exploded!

I have trawled the net 1 million times looking for SI deluxe pinouts. I am
sure I have just wired it up wrong, but The manual scans are aweful, and
there are no specific pinouts for SI Deluxe.

I am assuming that the 16 pin connector is the correct one to use ?

I am assumeing that pin one is to the right and pin 16 is to the left (due
to the fact that pin 7 is a key like on original SI ) also pins 1 & 2 (or 2
& 3 .. can't remember dont have the board in front of me ) are ground pins
as they should be in the SI pinout.

Please help. I can't see what I am doing wrong.

I can't switch the board on like this for more then 500 millisecs as I know
its going to go bang.

Luke

 

[P-Man]

Re: [ukvac] [Tech] Midway Space Invaders Deluxe Nasty
luke, you can plug a standard SI loom into an SI deluxe pcb set...

the connectors look different, but if you plug the connectors on keeping
track of the keyed pins, it works fine. Are you supplying power to the sunds
board? you need to supply power or it wont bootup.

Andy Welburn
www.andys-arcade.com

> Hi,
>
> Trying to make a Jamma adapter for both SI and SI Deluxe so that I can
> repair the load I have on my test bench
>
> Wired the motherboard ok. Get garbage on the screen (split video and sync
> ok)
>
> Sticking a SI deluxe sound board in doesn't make any difference
>
> Grounded the POW (Pin 6) and the onscreen garbage goes slightly wavy like
as
> if the monitor needs capping, but doesn't change
>
> Hmmm, I thought, maybee I need to wire up the sound voltage ... 18volt
....
> 12volt will do right?
>
> Pin 11 12volt pin 10 gnd .....
>
> noooo ...... horrible sounds coming from the pcb .... <click> .....
> hopefully switched it off just in time
>
> When I wired in the 12volt to the sound board it made an aweful sound (on
> the board not the speaker) like a high pitched cracking
>
> I've heard this before, on an Atari pcb, shortly before the coin counter
> transistor exploded!
>
> I have trawled the net 1 million times looking for SI deluxe pinouts. I am
> sure I have just wired it up wrong, but The manual scans are aweful, and
> there are no specific pinouts for SI Deluxe
>
> I am assuming that the 16 pin connector is the correct one to use ?
>
> I am assumeing that pin one is to the right and pin 16 is to the left (due
> to the fact that pin 7 is a key like on original SI ) also pins 1 & 2 (or
2
> & 3 .. can't remember dont have the board in front of me ) are ground pins
> as they should be in the SI pinout
>
> Please help. I can't see what I am doing wrong
>
> I can't switch the board on like this for more then 500 millisecs as I
know
> its going to go bang
>
> Luke
>
>
>
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
> .

 

[LukeWells]

Re: [ukvac] [Tech] Midway Space Invaders Deluxe Nasty
Thats when things went wrong, when I applied 12v+ to pin 11 of the 16 pin
connector (counting 1 from the right 16 at left) thats when it made a
horrible crackling noise like it was going to explode.

Thats why I am assuming I am wiring something wrong. Like I am shorting out
one of the large transistors or something

Luke

 

[P-Man]

Re: [ukvac] [Tech] Midway Space Invaders Deluxe Nasty
Oh, and by the way, you have to remember that if you ground the POR (power
on reset) it takes about 1-2 seconds for the watchdog to kick and clear and
fire the pcb up. Because you're not supplying a proper POR signal, the cpu
runs into garbage and crashes, and it waits for the watchdog. The watchdog
turns the pcb over only every 1-2 seconds.

Andy Welburn
www.andys-arcade.com

 

[P-Man]

Re: [ukvac] [Tech] Midway Space Invaders Deluxe Nasty
look on the schems, and studying the foil onthe pcb. The ground for the
sound amp is isolated from regualr game pcb ground, that is one oddity.

the next is the coun counter transistor, which also uses 12v, careful you're
not just hooking that up.

I once had a weird problem in my wiring where the sound worked, but
everytime there was a thump, or you fired, or you hit an invader, the coin
counter clicked over. that was the result of putting the 12v on the wrong
pin.

Andy Welburn
www.andys-arcade.com

 

[LukeWells]

Re: [ukvac] [Tech] Midway Space Invaders Deluxe Nasty
> look on the schems, and studying the foil onthe pcb. The ground for the
> sound amp is isolated from regualr game pcb ground, that is one oddity.

A quick continuity check reveals that pin 1,2,10 are ground (10 being sound
amp ground) so doesn't look isolated to me.

pin 11 should be +18v (12v)

pin 6 por

pin 8,9 speaker

The schematics are of no use seen as they think there is an 11 pin
connector, which there isn't

The cracking sound only happens with pin 11 connected to +12

Going by everyone saying that you can plug SI Deluxe on a SI loom if you
follow the keyed pins then there should be no reason why I am wiring 12v in
the wrong place .....

I am assuming the connector as follows

16 - 15 - 14 - 13 - 12 - 11 -10 - 09 - 08 - KEY - 06 - 05 - 04 - 03 - 02 -
01

As SI is

14 - 13 - 12 - 11 -10 - 09 - 08 - KEY - 06 - 05 - 04 - 03 - 02 - 01

> the next is the coun counter transistor, which also uses 12v, careful
you're
> not just hooking that up.
>
> I once had a weird problem in my wiring where the sound worked, but
> everytime there was a thump, or you fired, or you hit an invader, the coin
> counter clicked over. that was the result of putting the 12v on the wrong
> pin.
>
> Andy Welburn
> www.andys-arcade.com
>

 

[P-Man]

Re: [ukvac] [Tech] Midway Space Invaders Deluxe Nasty
i don't have the loom or pcbs at my computer, but hang on, are these known
working pcbs?

if you are confident the loom is ok, then you now have a sound pcb prob to
fix?

Andy Welburn
www.andys-arcade.com

 

[LukeWells]

Re: [ukvac] [Tech] Midway Space Invaders Deluxe Nasty
They have all been tested in a midway upright and AFAIK they all either run
to some extent but have graphics problems, missing sounds, one or two sets
just sit with a black screen.

Non made horid noises when plugged in so I am assumeing something is not
right in my version of the loom that is causing problems for deluxe boards.

I have only tested the one board on the loom I have made. If I have wired
something wrong thats going to damage the boards then I only want to do it
to 1 board not 5.

The inconsistancy of information on the net is frustrating me as I can't
find one single doc that says "on a space invaders deluxe pin 1 is x pin2 is
x" everything is round the houses and or differnt from whats actually on the
board.

I have of course tested for shorts on the sound board power rails

It could be the board at fault, it could be the loom but I don't want to
power it up like it is cause I know I am going to get shards of plastic in
my eyes if I leave it on for more then a second.

 

[Alpha1]

Re: [ukvac] [Tech] Midway Space Invaders Deluxe Nasty
Wear safety goggles and leave it on

'It could be the board at fault, it could be the loom but I don't want to
power it up like it is cause I know I am going to get shards of plastic in
my eyes if I leave it on for more then a second.'

 

[P-Man]

Re: [ukvac] [Tech] Midway Space Invaders Deluxe Nasty
unhook the 12v entirely.

power it up how ou think it shold be wired.

sit back and wait for the watchdog reset the pcb and see ifit runs.

Andy Welburn
www.andys-arcade.com

> It could be the board at fault, it could be the loom but I don't want to
> power it up like it is cause I know I am going to get shards of plastic in
> my eyes if I leave it on for more then a second

 

[LukeWells]

Re: [ukvac] [Tech] Midway Space Invaders Deluxe Nasty
So the watchdog should bark every 1-2secs even if there is no POR, or does
the watchdog only start barking after POR goes low?

Without the 12v connected to the audio board (12v is connected on the 8080
motherboard) and the POR to ground I have not managed to get any of the
boards to get out of the garbage on screen state, when in a real SI cab some
of them fired up but had shit sprites and or sound probs

Logic probe shows that reset on 8080 staying high

Obviously will try pulsing the reset manually, but I havn't looked at that
yet until I managed to get the damn boards wired up properly

Cheers

Luke

 

[Dave2084]

Re: [ukvac] [Tech] Midway Space Invaders Deluxe Nasty
At 03:40 pm 8 04 2003, you wrote:
>The inconsistancy of information on the net is frustrating me as I can't
>find one single doc that says "on a space invaders deluxe pin 1 is x pin2 is
>x" everything is round the houses and or differnt from whats actually on the
>board.

Try this:
http://www.robotron-2084.co.uk/manuals/invaders/midwayinvaderlpinout.pdf
and this
http://www.robotron-2084.co.uk/manualsinvaders.html

It also shows you how to simulate the POR with about 50p worth of parts!

BTW guys ... lets save the guys on a dial up [unlike me! ;o) ] some time
and delete unnecessary re-quotes in the Emails.
I deleted almost 150 lines of text from this Email which were not needed!

Dave Langley
www.robotron-2084.co.uk