Add EEPROM dump and readme

PowerReplay.kicad_sch

@@ -5767,6 +5767,10 @@
 		(at 129.54 184.15)
 		(uuid "66f37b2c-23db-4848-946d-239ccf071f37")
 	)
+	(no_connect
+		(at 231.14 58.42)
+		(uuid "67e4a2b7-da33-4eb0-b7e4-0986eedc90bc")
+	)
 	(no_connect
 		(at 58.42 184.15)
 		(uuid "72b4e1cc-9f71-48af-910a-17bf35216bd0")

README.md

@@ -1,2 +1,31 @@
-# PS1_PowerReplay_RE
+# PS1 Power Replay Datel clone - RE Notes
 
+## Introduction
+
+I found one of these cloned Datel cheat carts for PlayStation 1 in a box of junk at a flea market.
+I decided to reverse engineer it just for fun, and maybe to build a better variant of it.
+
+![Photo of the assembled PCB](pics/assembled/full_board.jpg)
+
+![Screenshot of the traced PCB](pics/traced_board.jpg)
+
+## Notes
+
+The PCB was fully disassembled, scanned, and traced to reconstruct the schematic.
+It's a simple dual-layer board containing a diode, a PLD, an EEPROM and a transceiver, plus a few passives.
+
+### Power regulation
+
+While the PCB has provisions to fit a 78L05 voltage regulator plus filter caps, the actual regulation on
+this board was cheaply hacked together using a 5.1V Zener plus a 150 ohm resistor for current limiting.
+
+### EEPROM size
+
+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.
+
+### PLD
+
+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.
+
+This IC was protected on my board, so I proceeded with an analysis of the signals and their combinations.
+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.