Feb 212020
 

21/02/2020 10:59 ( AEST )

I’ve been meaning to update this page for awhile but work and life has got the better of me.

If your Track&Field/Hyper Olympic has the following layout then you have unencrypted roms and you will need this updated version of my diagnostic to run on this particular board.  Note that this version will not run on boards equipped with a K1 cpu ( 42 pin custom IC ) or a game ( usually a bootleg ) with daughterboard that has a 6809 processor onboard, the daughterboard version also has some extra logic associated with it to decrypt/unscramble the opcodes.

Note: The board does not have a K1 CPU but uses a standard 6809 processor to run the game. Decryption related circuitry is also absent from this version.

I have prepared a version that will run on this board.

See TEST VERSION 1.2 – Unencrypted for download

9/02/2017

TEST 1.2 is now the current version which installs in socket 5A on Konami and Centuri versions.

  • Fixed detection of ROM A7 [ $9E99 ] ( Hyper olympic bootleg) which broke in TEST 1.1

See TEST VERSION 1.2 for download

21/08/2015

TEST 1.1

This is a test release.  A BETA version will replace it and this post will be updated pending sufficient feedback. It has been reported by one tester that this version works on real hardware but more feedback is desired.

IMPORTANT: The diagnostic EPROM now installs @ 5A on the Centuri and Konami boards. For the Hyper Olympic bootleg install the EPROM @ A7 and for the NZ bootleg install @ 2A.

This frees up 4 sockets for verifying game EPROMs instead of only 3. Since 5A is mapped to 0xe000-0xffff and the reset vector is obtained at 0xfffe/0xffff, it made sense to move the test rom to this socket.

See TEST VERSION 1.1 for download

test 1.1

IMPORTANT: All versions below install in socket 1A

18/08/2015

Bullet points represent items fixed in the current version.

BETA 1.3 is current.

  • ROM A1 FOUND! text missing when generated check-sum verifies successfully in socket 3a & 4a.

TODO: Future versions will install in socket 5a. The main reason for this change is to ensure the test rom boots since the 6809 obtains the reset vector from EPROM A5 ( 0xfffe ), there is a chance that the reset vector could be corrupted if the game EPROM A5 is bad. Moving the code to run from socket 5a will prevent such an event and also make the first 4 sockets available for verifying an A5 EPROM or any others.

 

See 1.3 for download CHK: F3E9 CRC16: 1421

16/08/2015

BETA 1.2

  • Further checks suspended if video ram/colour ram is bad. Priority given to preserve NVRAM/high scores. ( worst case scenario – screen totally unreadable ).
  • Introduced audio alert. 5 beeps for bad video ram 12H, 6 beeps for bad colour ram 11H.
  • Provided work around to keep tiles on screen if scroll ram is detected as bad.

See 1.2 for download CHK: F3EB CRC16: 5695

Special thanks goes out to Purity on UKVAC for his help with testing and feedback.

1/08/2015

BETA 1.1

  • Fixed SFX menu. Speech now plays from sound index 0x80

If you believe there are missing sounds please report them in the comments.

See 1.1 for download CHK: 9909 CRC16: AB36

30/7/2015

BETA 1.0

  • Bootleg rom support added ( see hyprolymb from the MAME set )
  • Fixed watchdog reset issue during EPROM check routine
  • Fixed character bank bug ( was displaying extra bank of null tiles )
  • Added CRC of current software to version string ( calculated at runtime )

BOOTLEG – HYPER OLYMPIC ( hyprolymb )

ROM A1 $9E99
ROM A2 $35E8
ROM A4 $2FDC
ROM A5 $7DD2
ROM A7 $F932

TODO: Fix SFX test in diag mode. Speech is not playing.

See 1.0: CHK: 9F7E CRC16: 2F6F

26/07/2015

BETA 0.9

  • Support for Hyper Olympic roms added
  • MISC code improvements

See 0.9 CRC16: 70E6

0000

See below for correct 16 bit checksums matching your set.

Pre-calculated ROM Checksums.

KONAMI – TRACK & FIELD

ROM A1 $9F6E
ROM A2 $3620
ROM A3 $2FA5
ROM A4 $7CA6
ROM A5 $FEEB

CENTURI – TRACK & FIELD

ROM A1 $9DBE
ROM A2 $3CA7
ROM A3 $17C8
ROM A4 $569E
ROM A5 $E991

KONAMI – HYPER OLYMPIC

ROM A1 $9E79
ROM A2 $35E8
ROM A3 $2ECE
ROM A4 $7DD2
ROM A5 $F932

25/07/2015

BETA 0.8

  • Support for Centuri roms added.

See 0.8 CRC16: 9EBE

24/7/2015

BETA 0.7

This EPROM installs on the CPU board @ 1A. This does not replace the original software in 1A but is only used as a means of testing the main-board, sound and video.

Diagnostic mode is accessible by holding down player 2 start whilst powering the game on.

In the normal mode ( power up tests ), nvram tests may be skipped to preserve high score data if so desired. This is done via DIP 8 of SW2. A ~10 second countdown is also included even if you desire to test your nvram, in this mode nvram tests may also be skipped by pressing the “player 1 button 1”.

Power up tests also include a rom utility. This currently identifies track & field software in any of the 3 available sockets ( 2A to 4A ). For example, an A1 ROM installed in any of the above available sockets will still be identified for its designated 1A socket.

Important: A5 ROM needs to remain in socket 5A, this is because the 6809 obtains its reset vectors from this ROM. If the test rom or game fails to start and the screen is full of zeros, verify the A5 rom manually. 

Note: That this is a very BETA release and is currently in the testing phase, bugs are expected. Use at your own risk if you love those high scores.

See 0.7  CRC16: 8C8A

Feb 182020
 

A few updates.
*Small bug fix when loading larger files so they now load.
*Removed a couple of the more obscure routines as I wasn’t happy with them.
*Now, if the loaded file is an uneven size it will offer to pad the file for you. Minimum size for this is 0x400.
*Fixed a bug with bit manipulation when saving/loading settings

DOWNLOAD

 Posted by at 10:46 am

Double Dragon II – The Revenge repair log #2

 PCB Repair Logs  Comments Off on Double Dragon II – The Revenge repair log #2
Jan 252020
 

This board is a bootleg board but seems to follow the original fairly accurately.

On initial boot up this didn’t do a great deal but then other times it actually started up with various errors.

A fault like this always makes me look at the reset circuit.
This board uses a 6809 as the main CPU and a Z80 as a sub CPU.
The reset pin for the 6809 is pin 37 and using the scope I could see that most of the time it didn’t do what a reset should do.
Tracing it all back I came to this

The reset circuit on this is as simple as it gets really with a capacitor, resistor and diode.
I removed and replaced the capacitor and now the game boots up every time.

Now, although the game booted it appeared to crash when entering attract mode or starting a game with this fault

I remembered Bryan McPhail had the very same issue some time ago and he mentions that the sub CPU needed to be running.
Checking the ROM for the sub CPU I found pin 1 (A15) was dead. Further inspection of the solder side of the PCB I found this

I patched this up as neat as I could and covered it using an overcoat pen

Now the issue was fixed

Last thing to do was deal with the sound.
My initial inspection of the PCB showed the volume pot had been messed with

I removed it and found some bad track damage underneath and on top

I fitted a new pot and patched all this up nicely but I still had no sound.
Tracing it out revealed that the bootleggers mixed up the two SPEAKER connections so SPEAKER+ was connected to SPEAKER- on the JAMMA edge and vice versa.
I spoke to Muddymusic to see what he wanted me to do. The option were hack the board to swap them or make an adapter. The prior option was chosen and I cut the two traces and ended up with this solution.

Now everything works great

 Posted by at 6:53 pm
Jan 012020
 

Next up in the box of brokenness is a Pacland.

Visual inspection revealed the amp had blown up

I also saw the usual corrosion on the legs of some of the customs

and the socket didn’t look too great either

As you would expect there were some pins missing from the chip when I removed it

I soldered legs on best I could and opted to fire the board up.

This is a good start and using the error code list compiled by my good friend cmonkey I knew that this was a RAM fault.
Checking RAM 9N I found several address lines were dead

Using the schematics I could see those address lines came from a 74LS32 @ 10J

I confirmed the outputs were bad and replaced the chip.
Now I get this when booting

Game is booting but some scroll issues and some jailbars too.
I could affect the scroll issues by pressing on that custom chip I resoldered at the start. I removed it again and attempted to further clean the legs but I just made it all worse. In the end I opted to solder it into a socket.
It looks crappy but it got the job done

Scroll issues fixed I now turned to those jailbars.
This ended up being an easy fix. I removed the ROM at 6T and checked it in my programmer. Bit 5 was stuck high so I replaced the ROM which fixed the jailbars.

Last thing to deal with was the sound. Obviously I wasn’t going to get far without an amp and I don’t have any spares. Lucky for me, my friend Smarty sent me a replacement gratis which fixed the sound and completed the repair.

Thanks very much to Smarty for the amp.

 Posted by at 10:08 pm
Dec 302019
 

Bought a cheap Desert Breaker for my collection which the seller declared as having no sound.

 

This game is running on system18 hardware. Since the sound was totally missing I first tested the z80 which was good and then I desoldered the SRAM which was

a Toshiba @IC79 , normally very unreliable in comparison to other makers and infact it was faulty.

It fixed the sound but playing I noticed that some sprites had missing lines

 

This problem could be either the custom chip 315-5361 ( sprite generator ) or the srams connected to it ( IC21 and 22)

Since all the address line were good, I proceeded to desolder and test the srams which were infact bad bad.

 

Game was fixed totally