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44 lines
1.9 KiB
Markdown
44 lines
1.9 KiB
Markdown
# PS1 Power Replay Datel clone - RE Notes
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## Introduction
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I found one of these cloned Datel cheat carts for PlayStation 1 in a box of junk at a flea market.
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I decided to reverse engineer it just for fun, and maybe to build a better variant of it.
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## Hardware
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### Memory map and protocol
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Information on the protocol can be found [here](https://psx-spx.consoledev.net/cheatdevices/#cheat-devices-datel-io), but here is the basic memory map of this device:
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```
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1F000000h-1F01FFFFh R/W Flash (first 128K)
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1F020010h R Comms Link STB pin state (bit0)
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1F020018h R Switch Setting (bit0: 0=Off, 1=On)
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1F040000h-1F05FFFFh R/W Flash (second 128K)
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1F060000h R Comms Link data in (byte)
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1F060008h W Comms Link data out (byte, pulses ACK to Comms Link)
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```
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## Notes
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The PCB was fully disassembled, scanned, and traced to reconstruct the schematic.
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It's a simple dual-layer board containing a diode, a PLD, an EEPROM and a transceiver, plus a few passives.
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### Power regulation
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While the PCB has provisions to fit a 78L05 voltage regulator plus filter caps, the actual regulation on
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this board was cheaply hacked together using a 5.1V Zener plus a 150 ohm resistor for current limiting.
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### EEPROM size
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The EEPROM used on this board is a PLCC AM29F010, 128KB. The Board is wired in a way that a 29F020 can be installed and the a second bank of 128KB used.
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### PLD
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A GAL16V8B provides signal decoding to enable the transceiver, EEPROM, read the state of the STROBE signal on the DSUB-25 connector and of the sliding switch.
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This IC was protected on my board, so I proceeded with an analysis of the signals and their combinations.
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The results can be seen in the `PLD` directory, and **have not been tested yet**. Interestingly, while connected, the A20 line seems to be ignored in all the calculations performed by this PLD.
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