Donkey Kong High-Score Save

Overview

This request came up a few time, however DK is not very straight forward, due to the fact that none of the board RAMs are socketed and they are all 4kbit ( 1k x 4 ), no simple hardware mod. of 'plug in a Dallas'.

With this project I have documented both the hardware theory and the software for the complete upgrade, including the source code, if anyone wants to take a look. The three modified program images are also here, so solder away burn some new ROMs and have fun !!

Also worth a mention... to make it clearer I have the EEPROM 'flying' in mid-air, you can make a much neater job using shorter wires and locking the thing down onto the PCB.

Theory of Operation

The serial EEPROM 93C56

Link to the Datasheet, at Microchip.com

Board Connections Overview

Board Connection Wiring Close Up

Click For Details

Updated Program Code

Click to Download

*note* these are ONLY useful if you have the
ORIGINAL Donkey Kong boardset *

This is NOT a full set of images, it is
ONLY the 3 modified EPROMs

Parts Required

1 x ST93C56 or 93LC56A or ST93C66A

NOTE: The EEPROM must be the 256x8 type from either ST Microelectronics, or Microchip.
The ST93C66 is a 512x8 serial EEPROM this will also work.
2532 EPROMs x 3

For serial EEPROMs check http://www.digikey.com or http://www.mouser.com

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