Repair Log – Namco Time Crisis 2 Gun
I just added some information about the gun sensor PCB used on Namco games such as Time Crisis and Time Crisis 2 Check it out here
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Namco Time Crisis 2 Gun
One of the guns on a Time Crisis 2 was no longer registering shots on the screen. Following checks on wiring, cleaning lens, etc. it appeared that the optical sensor (opto) was dead. This is a small PCB in the gun, 2421961100, pictured above. I couldn’t find any schematics or information about the parts used,…
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Updates for 2026
It seems that Coin Op Collection have completed a Snow Bros core for MiSTer before I did. Not really surprising since I have taken ages on this one. I had suffered from one of the same problems as they did, so at least I was on the right track. For the moment I will look…
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Fluke Z80 to S2650 pod converter – Update
One of the users discovered a minor problem with the Fluke pod converter PCB which causes problems mainly when used on Zaccaria pinball PCBs. It seems I missed one of the tracks off from the original article that connects the INTACK signal to GND. This has been fixed on the latest PCBs, but if you…
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MiSTer Snow Bros – Work in Progress
Just a quick shot as it appears I have finally got the code for the Pandora graphics chip to work as intended. This is not running game code, I just grabbed the memory content for the colour and sprite registers and load it for testing, but after several false starts it is finally behaving itself….
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Shop – Tariffs for USA
The post office have now made adjustments to allow shipping to the USA once again. Any items now sent to the USA will have a 10% tariff surcharge added, along with a slight increase in postage (as the Royal Mail charge an extra 50 pence for paying the tariff on your behalf) At least I…
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Shop – Shipping to USA
It seems that some of the multitude of changes in policy within the USA have meant that the British postal service will no longer accept packages destined for that part of the world. So, until this situation has been resolved, I can no longer send anything from the shop to the United States of America!
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Store Discounts
I have a few customers who buy several sets of PCBs to allow them to sell kits or fully assembled versions of my projects. It only seems fair that I reward them for their continued support, so in future buying 10 sets of PCBs will enable a 10% discount. If you really want to go…
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MiSTer to Crazy Climber
I used one of the Astrocade PCBs recently to make an adapter to allow me to put a MiSTer setup into my Crazy Climber cabinet. I populated the video, a single sound channel and the regulator, added an amplifier and then wired an edge connector and video pins to plug into the cabinet. End result…
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Galaxian Multigame fixes
A user who had put a galaxian board running the multigame into his pacman cab noticed that Super Invader Attack did not fire properly, working about once in twenty button presses. He had used the Start button as the fire button (as well as Start), which works in most of the games, but in the…
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Bally Astrocade Interface – Space Zap Composite output
The new version of the RGB PCB has arrived, along with the updated design for the composite output for Space Zap and I have assembled one and connected it up to my Amiga monitor. It now has potentiometers to allow the signal levels for Sync and Video to be adjusted to work nicely with your…
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Bally Astrocade Interface – Space Zap Update
An attempt was made to put the Astrocade interface into a Space Zap cabinet sporting a monochrome monitor. It didn’t work so I began investigating exactly what the problem was. It seems I misread the MiSTer IO schematic, and put a GND where a vertical sync should be, so it was not actually passing the…
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Webserver Upgrade
Since it originally appeared in 2003 this website has been edited by a few pieces of software and hosted on many different types of hardware. It was originally created using Frontpage 2000 and hosted on the webspace I got from my ISP (Do you remember when you used to get that with your dial up…
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Building a Light Gun
I fondly remember playing games like Confidential Mission on my Dreamcast in the games room, displayed on a 26″ Hantarex screen that came out of a video conference room. However, with the switch of TVs and monitors to LCD / OLED etc, these old guns no longer work. After doing some browsing across several web…
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Going Green
From now on all of the power used to host this site is supplied by the sun. This is down to a combination solar panel / battery system installed by UPS Solar which seems to be performing well at the moment, certainly better than the info I gleaned from several websites as to how much…
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Retro Chip Tester – 2708 Adapter
One of the reasons I wanted to build a Retro Chip Tester (RCT) was because there are several adapters available that let you extend the capability of it. The one I had an immediate use for was the 2708 programming adapter. I ordered some PCBs for this, put it together and it has now been…
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Retro Chip Tester
The Retro Chip Tester (RCT) was developed to test „old“ memory chips from the 1970s and 1980s, which are often no longer recognized by today’s programming devices. The RCT is able to identify defective memory cells very reliably. It can save the contents of ROMs, PROMs and EPROMs to a memory card. If the memory…
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Bally Astrocade Interface – Wizard update
Wizard of Wor has finally been tested! Almost a year after I did the original image for this game, it has been fitted to a cabinet and I’m pleased to say that after some minor problems the image has been updated and works as it should. Had a request for a change, which may also…
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Attack of the Clones – QMTech
If you have been keeping up with the MiSTer forums, you will know that there are now at least two DE10-Nano clones being produced, with one, the QMTECH version being available now, and another one due soon. The one pictured is the QMTech version, and this one has the 128Mb SDRAM fitted direct to the…
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Atari Tetris – patching out SLAPSTIC
One of the PCBs I own had a dead SLAPSTIC, Atari’s custom protection chip used in several games of the time, which meant I just got a nice ROM error in test mode and a blank screen instead of the game. Some old 8 bit hacking and we have hopefully fixed the problem. Check out…
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Atari Tetris
In normal mode, just had a blank screen. Enable test mode and you instead get an error message showing that the ROM test had failed (even though the rom itself checks out OK with correct content) This is because the custom Atari SLAPSTIC chip is not functioning correctly. It is used to page banks of…
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Store now live
After some experimenting with layouts / shipping and generally learning to use it, the Store is now live and ready to use. I’ve only put a few PCBs on there for the moment and until the next delivery there isn’t many of those available yet. More items will appear once I have finished sorting the…
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Bally Astrocade interface – Update BOM
I’ve updated the bill of materials for the Astrocade interface a little. Two items have been changed to have better descriptions and where people have let me know part numbers from Mouser or Digikey I have added them on.
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Bally Astrocade interface for MiSTer – Done
Version 2.3 of the PCB has arrived, been assembled and tested … and it works without any wire patches! There is, however, one minor problem. I added some extra bits of screen print on the wrong side. This has now been fixed on the gerbers and any future boards will be correct, but I am…
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Galaxian Updates for MiSTer
I know it looks the same as the pictures from the Multigame connected to a galaxian PCB, but this time I updated the Galaxian core on the MiSTer to allow me to run the multigame on it. It should make testing things a lot quicker since the MiSTer is always connected and ready to go….
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Cosmic Guerilla – Signs of Life
I thought that swopping the CPU in the cosmic core to allow me to do Cosmic Guerilla would be simple. How wrong was I … 16 bit vs 8 bit, different memory read write signals, different port handling, even the reset is different! Anyway, for the first time it actually shows something running on screen….
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WordPress update completed
I have finished moving the remaining pages from the old Frontpage website over to WordPress and put some of the archive history back in. I did have to modify a few things to make it more ‘mobile’ friendly so all pages should be viewable on your phone. (a few require you to rotate your phone…
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Make Trax Information
Information about Williams Make Trax game. PCB Screen Shots Pinouts If you are making a Jamma loom, then use the negative sync on pin R, as most monitors in Jamma cabinets appear to be set for this. The sync is taken from here, put through a 74LS04 inverter and back to pin F to generate…
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Galaxian Information
Information about Midway Galaxian PCB Screen Shots Pinouts Connections for AC version shown in (BOLD) DIP switches
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The Invaders – Zaccaria
Totally dead, no screen display (blank white screen). For this I used the Fluke Z80-S2650 adapter to check out the ram and rom, and located two errors. The rom mapping was incorrect, with a large range of locations returning random values. Examining the board (since I have no schematics), all of the chip select lines meet up…
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Sega System 16
Altered Beast – Colours missing, no reds, other colours looked like diminished palette (like windows in 16 colours) – used test mode to perform ram test, and one ram chip identified as faulty (I10). Replaced this and red was back, but still reduced pallette. Looking at colour circuit, and it uses resistor arrays driven by I11…
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Rainbow Island
On power up – black screen, no sign of life at all. I removed the 68000 CPU and fitted a socket, so I could use the Fluke on it. This revealed that the main program ram ($10C000-$10FFFF) was totally dead. Replacing the two ram chips IC25 and IC26 solved this problem. Board now started up,…
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Pacman
Screen filled with coloured lines, unstable, no sync (see above) – check clock signals from horizontal and vertical scan generators (74161’s at 2R,2S,3R,3S) – no signal feeding into pin 2 of horizontal generators. Follow trace back to 7474 at 3N, signal going in, nothing coming out – replace chip and screen display back to normal….
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Neo Geo
6 Slot – Memory test on power up giving error Address Write Read 00008000 5555 55FF Checking with Mame, the memory chips in question were only small, so looking at the board revealed two DIL 5814’s. Chip select signals to these were toggling as expected, so I needed to identify which ram chip was which….
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Mr Do!
Blank screen, Blanking line to output colour proms always enabled. Trace back to 74161 in timing circuit – output stuck, input clock all look OK – replace chip and picture appears. Blue video only – The video lines are controlled by three transistors near the edge connector, checking these revealed that 2 were not giving…
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Moon Cresta
Boots up, and plays, but incorrect sprites – most noticeable little bug changes into ‘END’ at one point. Check 74ls138 at 8n, controlling graphics banking, and pins strobing. Replace chip and now uses correct sprites. Quiet missile sound and explosion sound. Both of these effects use the op-amp chip, LM324 at 7T. Replace this chip…
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Missile Command
The board originally failed to get into the game, instead resetting just after drawing the ‘MISSILE COMMAND’ logo. Test mode faired a little better, managing to report RAM OK, MAP OK and ROM OK before resetting. Ram and Rom checked out OK using the Fluke. Measuring various CPU signals revealed that the interrupt seemed very…
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Make Trax
Boot up with garbage, quickly clears screen and then nothing. Used Fluke with Z80 pod – read rom OK, and write ram OK, but timeout reading any Ram location. Check fluke status and ‘wait’ always set. Check pin 24 of Z80– stuck low, trace back through 7H,7C,6C1 to 6B1 pin 2 – always low, although…
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Lady Bug
Board ID 8016 : Falcon version ? Static graphics on screen, dead – pin 24 low on Z80, /WAIT signal. Trace signal on board to 74LS74 at E7. Signal incorrect for inputs. Replace with new one, board fixed.
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Hantarex MTC9000/A
No picture, Hole blown through LOPT. Had problems tracking down replacement – little tip given to me by Hantarex engineer – you can use the LOPT from an MTC9000 as long as you cut pin 2 off. (If you leave it connected, you will get a direct short to GND)
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Cosmic arcade games for MiSTer
I managed to complete another core for the MiSTer today, been a while as I needed to get the two PCB’s working enough to sample the sounds. But all of the games from Mame’s Universal Cosmic driver that use a Z80 are now on there. Cosmic Alien, Devil Zone, Magical Spot, No Mans Land and…
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Monitor Information
I was looking for some information on arcade monitors, specifically listings of capacitors needed for Capacitor Kits, and everything I found seemed to be in the way-back archive rather than on current sites. So duly reformatted the information that I found, started adding links to manuals and schematics, where I have them, and of course…
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Clean Sweep completed
If you have the galaxian multi game, then I have a beta to test – Clean Sweep finally makes it in there. It should work with high scores and dip settings although it hasn’t been extensively tested. Grab the rom images here
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Crazy Balloon on MiSTer
Following on from Astrocade hardware, I thought I would like to do a core as near as possible from scratch. So apart from using the Z80 from opencores, and basing the timing code on that used in the Pacman core, I went from the Crazy Balloon schematics to produce a complete core for it. Where…
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Bally Astrocade arcade games on MiSTer
Well, what a weird year it has been so far. I’ve been learning to code in VHDL and Verilog on the MiSTer platform. The first task was one I have wanted to do since I bought an FPGA Replay was to take the existing Bally Arcadia console core, add in the necessary extra ram, pattern…
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Clean Sweep for Galaxian
New game on the way for the multigame, a conversion of Clean Sweep from the Vectrex. I have it running on standard galaxian hardware, just need to do some address and control changes to make it compatible with the Multigame setup.
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Xeltec Superpro Drivers X64
I heard from a user about a problem with the signed Xeltec drivers. So in case you are having the same problem :- My new PC has windows 10 installed as UEFI. Installing it that way enables secure boot by default and saves the default keys to your motherboard. Secure boot adds another layer of…
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New Test Rig
Finally finished building my new test rig! Hopefully get the rest of the test gear setup again and start fixing some boards.
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Multigame Amidar fix
Aaron mentioned that Amidar in the multigame always runs in cocktail mode, no matter what settings you selected. I am amazed no-one else had noticed this since it has been like it since the start! Anyway, for the one person who actually plays Amidar in two player mode, I have now fixed the bug. Grab…
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Attract mode for Moon Cresta
Phil, posted some code to implement attract mode when in freeplay for Moon Cresta. The version used in the multigame (bootleg on galaxian hardware) is close enough that it works with some minor modifications. I also fixed the ‘Freeplay’ message whilst I was in there. He has also posted code for scramble which I will…
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Future Pinball Driver for PinDMD3 (Update)
Slight update to the PinDMD3 driver, it now uses a 1×8 pixel colour mask to avoid ‘power of 2 texture’ problems. New cab delivered, so something else to keep me occupied on those winter nights – Crazy Climber!
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Future Pinball driver for PinDMD3
The new driver for PinDMD3 has been completed and is now available for download here. By default it works exactly the same as the ‘normal’ FPInterface and converts images and font data to DMD colour scales to display, however, add a decal with a special texture to the table and it proceeds to send all background…
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Attract mode for Galaxian
A fellow collector, Phil, posted some code to implement attract mode when in freeplay for Galaxian on one of the forums I frequent, so I have adapted the code to work with Galaxian, Galaxian Part X and Moon Alien within the multigame. I have also fixed a long standing coin counter bug just in case…