Search found 313 matches

by trmatthe
February 18th, 2014, 7:28 pm
Forum: Game Hardware Q&A
Topic: Nitro Ball PAL chip replacement
Replies: 12
Views: 2213

Re: Nitro Ball PAL chip replacement

I just looked in the mame-0149 ROM set and unfortunately 16L isn't dumped. They have the fusemap for JN-00 @ 17L which is the only PLD they seemed to have dumped.
by trmatthe
February 10th, 2014, 10:58 pm
Forum: Game Hardware Q&A
Topic: Twin Cobra PCB (US, Romstar) Freeze
Replies: 11
Views: 2148

Re: Twin Cobra PCB (US, Romstar) Freeze

Am not near any PCBs at the moment but if the pin count is correct then they're all wired the same on the inside. Just like people :D

Losing half/much of the GFX and still having the game run would make the interboard connectors my first port of call definitely.
by trmatthe
February 8th, 2014, 12:16 pm
Forum: Game Hardware Q&A
Topic: Twin Cobra PCB (US, Romstar) Freeze
Replies: 11
Views: 2148

Re: Twin Cobra PCB (US, Romstar) Freeze

I would remove and reseat the interboard connectors a few times. I've had a number of TCs which seemed terminal and this often fixes them without having to start scoping out the 68k. Not sure why but they seem to suffer from dodgier than average IDC cables. You could also try setting DSW1-3 and DSW2...
by trmatthe
February 8th, 2014, 12:07 pm
Forum: Game Hardware Q&A
Topic: sega system 16A pal chip Help
Replies: 8
Views: 1622

Re: sega system 16A pal chip Help

Hi. If you have no luck with this post back and I'll try dumping it for you. From a quick look it seems as though it's probably doing some address decoding so it ought to be a reversible type.

cheers
by trmatthe
January 20th, 2014, 5:17 pm
Forum: Game Hardware Q&A
Topic: Question to the techies: How are rom chips mapped?
Replies: 7
Views: 1004

Re: Question to the techies: How are rom chips mapped?

On the CPS1 hardware some of the B boards are setup to use 16 bit wide EPROMs and others use 8 bit wide (27512 or 27010 IME). You are right about how a 16 bit system interfaces with 8 bit wide ROM or RAM. Just stack a pair of chips, common the address bus and control signals and then have one delive...
by trmatthe
January 2nd, 2014, 8:59 pm
Forum: Game Hardware Q&A
Topic: BREAKING: SuperPang has committed suicide!
Replies: 13
Views: 1905

Re: BREAKING: SuperPang has committed suicide!

I've fixed a few of these for chums and you can do it with the absolute minimum of modification which is always nice :) On one I found an inverted colour tile on the title screen and spent *ages* hunting it down but I wasn't ever able to identify the cause so if you do/don't see this I'd be interest...
by trmatthe
December 13th, 2013, 6:02 pm
Forum: Game Hardware Q&A
Topic: CPS2 advice
Replies: 30
Views: 4376

Re: CPS2 advice

The CPU has a bit of RAM built in to it which stores decryption keys that it needs to run the game code. The RAM can keep its contents as long as long as a battery is applied, but it obviously consumes a tiny amount of power to do this. Over 10+ years the batteries eventually run flat or drop below ...
by trmatthe
December 9th, 2013, 3:50 pm
Forum: Game Hardware Q&A
Topic: New MAK/Supergun: Various problems...
Replies: 19
Views: 3204

Re: New MAK/Supergun: Various problems...

Hiya phil, The fan not spinning up could be expected behaviour depending on how it was designed so I wouldn't worry about that at the moment. There is definitely an issue with the internal speaker part though. I'd bet that every time the audio cuts out on internal speakers something is getting very ...
by trmatthe
December 9th, 2013, 12:42 pm
Forum: Game Hardware Q&A
Topic: New MAK/Supergun: Various problems...
Replies: 19
Views: 3204

Re: New MAK/Supergun: Various problems...

Hi phil, Do you have two speakers wired together in the supergun? Most of the arcade board amps were very similar to car stereo amps and are generally happy with a range of impedances but I'm wondering whether you've got two speakers wired in series (spk+ to terminal 1 speaker 1, terminal 2 speaker ...
by trmatthe
October 29th, 2013, 12:17 pm
Forum: Game Hardware Q&A
Topic: Help with GQ-4X w/ adapter
Replies: 40
Views: 8091

Re: Help with GQ-4X w/ adapter

As I mentioned before I really don't think you have a problem blanking them. They're reading as 0xFF which is what a properly blanked EPROM will read as. If you want to be certain that you can completely eradicate this as a possible cause, read a blanked one in and see whether the file is just 0xFF....
by trmatthe
October 25th, 2013, 6:11 pm
Forum: Game Hardware Q&A
Topic: Help with GQ-4X w/ adapter
Replies: 40
Views: 8091

Re: Help with GQ-4X w/ adapter

0xFF is what an erased UV EPROM will read as, so this suggests that the chip is wiped OK but is resisting programming. You program a UV EPROM by grounding each memory cell which will take it to a bit 0 so it seems to me that the failure is in dropping the UV induced charge. I don't recall seeing a p...
by trmatthe
September 30th, 2013, 9:55 pm
Forum: Game Hardware Q&A
Topic: Non-working coin mech - any tips?
Replies: 4
Views: 980

Re: Non-working coin mech - any tips?

Can you tell us what mech it is? It should have a manufacturer/model label on it.
by trmatthe
September 23rd, 2013, 12:23 pm
Forum: Game Hardware Q&A
Topic: Bootleg: Golden Axe
Replies: 5
Views: 1255

Re: Bootleg: Golden Axe

Ninn's advice is your best bet.

Can you put the game into test and try a switch test?
by trmatthe
September 17th, 2013, 2:25 pm
Forum: Game Hardware Q&A
Topic: Mr Driller G - PCB Problems
Replies: 11
Views: 2003

Re: Mr Driller G - PCB Problems

It looks like corrosion of some kind to me, but not from the caps. The whiter parts of the brown deposits look like a reaction product. I'd get a refund - I can only see that becoming more of a problem :(

Shame as its a great game.
by trmatthe
September 3rd, 2013, 4:07 pm
Forum: Game Hardware Q&A
Topic: Ninja Baseball Batman 3/4 player adapter
Replies: 9
Views: 1580

Re: Ninja Baseball Batman 3/4 player adapter

Hi dude, That looks like standard 0.1" pitch connector. I buy strips of the plastic from Maplin and a handful of the pins, solder/crimp to my wires and then slide the pin inside the housing. http://www.maplin.co.uk/0.1-series-socket-housing-1490" I can't be 100% certain from that image that it is 0....
by trmatthe
September 3rd, 2013, 4:00 pm
Forum: Arcade Games
Topic: Gunlord 1cc speedruns
Replies: 9
Views: 1780

Re: Gunlord 1cc speedruns

Impressive dude! Only half way through the first half of arcade mode video, but you can play *and* narrate. When I'm going for a high score on Star Wars, my tongue is firmly poking out and it's all I can do to remember to blink. The game looks sweet too so I think I might track it down for my Neo. C...
by trmatthe
September 3rd, 2013, 3:51 pm
Forum: Arcade Games
Topic: Original Prices for Arcade Games
Replies: 17
Views: 3948

Re: Original Prices for Arcade Games

Hi. That Star Wars cockpit was a bit of a bargain!

This site shows you the effective value of money in previous years.

http://www.thisismoney.co.uk/money/bill ... -1900.html"

IIRC they use the RPI to scale values.

Tim
by trmatthe
August 24th, 2013, 9:13 pm
Forum: Game Hardware Q&A
Topic: Modified Irem M92 Ninja Baseball Batman
Replies: 25
Views: 5535

Re: Modified Irem M92 Ninja Baseball Batman

Guys,

It's a hobby. We do it for fun and enjoyment. So what if you don't want to touch yours, he wants to use a pot, and the other guy makes something on stripboard?

We're not deciding the leader of the free world here, we're meant to be having fun :lol:

tim
by trmatthe
August 21st, 2013, 9:47 am
Forum: Game Hardware Q&A
Topic: How to Phoenix an XmenvsSf asia board?
Replies: 8
Views: 1495

Re: How to Phoenix an XmenvsSf asia board?

Asure wrote: (You can also turn any game into another game if you want, and know what you are doing.)
Indeed, but you can't go any further on that here sorry :awe:
by trmatthe
August 21st, 2013, 9:44 am
Forum: Game Hardware Q&A
Topic: Modified Irem M92 Ninja Baseball Batman
Replies: 25
Views: 5535

Re: Modified Irem M92 Ninja Baseball Batman

Nope, not against the rules. You're not making it into something it isn't or enabling others to do the same. There's no reason why you can't post full details if you chose to. I can see this wouldn't be to everyone's taste but it's quite interesting all the same.

Cheers