JAMMArcade.net – Page 262

Dreamcast battery change

General, Guides Comments Off

Dec 072010

My Dreamcast was not saving the time and date settings I was putting in which got a little annoying as its setup for dumping GD-ROMs and isnt normally connected to a display.
The battery change is very simple.
1. Remove any GD/CD ROM from the drive
2. Remove the modem/BBA
3. Remove the 4 screws, one at each corner. They are normal screws which makes a nice change.

The top should now lift off and you can now see the battery on the small PCB at the front where the controllers connect (its the blue thing on the picture below
4. Remove the small ribbon cable, it just pulls out
5. Unplug the small fan from the board
6. Remove the 4 screws holding the controller PCB down.
7. I had to remove the 2 screws holding the power supply down, lift the power supply board up which allows the front board to lift out also.

8. Desolder the old battery and clean up the 3 holes.
9. Fit a new battery. I used a rechargeable CR2032 with radial pins attached.

10. Put everything back together and fire it up. Easy

Vogatek Megadrive controller PIC Mod

Mods Comments Off

Dec 072010

I use a Vogatek supergun for my JAMMA test rig which accepts Megadrive joypads as the inputs and is controller via the PICs onboard. The problem with this is that if there is no controller inserted into one or both of these ports then it activates random button presses causing all sorts of unwanted actions to happen. After a bit of research and searching the net I found a link from a guy who has made an update for these PICs.
I have not been able to get in touch with the guy that made this but it is excellent and I am putting it up on here for anyone that may find it useful. If the original author wants me to remove this then please let me know, or just let me know who you are anyway as a big thanks is in order to you.
Just erase the currently installed PICs and replace program the attached .HEX file to it.
With this mod the A button is required to be pressed before any other button will register, this stops the random button presses from happening.
Also, with a tiny 2 wire mod to the board you can coin up from the controller by pressing START and C. All information is included within the ZIP file.
All credit goes to Matt-MCJDesign for these files, I am merely hosting them.
Supergun Controller Mod

Golden Axe repair log #2

PCB Repair Logs, Repair Logs Comments Off

Dec 022010

My Golden Axe (set 1, World, FD1094 317-0110) had suicided.
I have a copy of the decrypted ROMs from Sega Resurrection. I pulled the two EPROMs from locations A1 and A2 on the top board (27C2001), erased and reprogrammed them and also fitted a standard 68k CPU in place of the custom block.
My Golden Axe board is alive once more and now have no worries about that suicide battery anymore.

Dataman-48pro2

General Comments Off

Nov 302010

My new programmer arrived today.
This things does everything I could ever want including EPROM/EEPROM/Serial EEPROM/Flash/Nand Flash/NV RAM/PLD/MCU MPU/PROM. It also covers IC testing, RAM testing and some special devices that Ive never heard of such as clock synthesizers. It supports over 53000 devices and the software is updated every month.

Goodbye G540, hello again Dataman

General Comments Off

Nov 292010

I have been using an old Dataman S4 programmer for years now. It has been an incredible piece of equipment and has not let me down once. I have the MOD40 and MOD42 adapters so I can program the larger EPROM’s 8/16bit.

A while ago I needed to program a GAL, which the S4 does not support without another expensive adapter so I invested in a cheap Chinese programmer that claimed to support them all. It served its purpose of programming some GAL’s but has been used very little since as its just not that good.
More recently I wanted to program a PIC16 for the NAOMI DES Dumper and once again the S4 does not support this natively and the G540 did. I programmed the PIC with what looked like ease and off I went to test. The PIC displayed correct initially but any output from the security PIC was corrupt. It turns out that the G540 loads the EEPROM data as 16bit data therefore every other byte was 00 which rendered the program useless. I got around this by manually editing the EEPROM data with the G540 software just before I set it off programming and this worked but its not something I was happy with.
After a lot of thought and some pleading here and there with various people I have negotiated a very nice deal and Dataman are accepting my old S4 programmer as a trade in on a new Dataman 48pro2 programmer. This thing does it all and I look forward to its arrival.

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