# PS1 Power Replay Datel clone - RE Notes

## DISCLAIMER

Any use of this project is **under your own responsibility**.
You will be responsible of checking the correct construction and functionality of your board.
By using this project You will agree that I cannot be held responsible if it will destroy any of your devices, damage your computer, burn down your house or whatever.

## Introduction

This board is a reconstruction (with a few improvements) of a clone of a Datel cheat cart for PlayStation.
This project builds upon the work I uploaded in [this repository](https://github.com/hkzlab/PS1_PowerDeplay_Datel_RE) repository regarding the reverse engineering and mapping of said clone.

This device can be used with the original (provided) EPROM dump, or with [unirom](https://unirom.github.io/).

I replaced the crappy zener-diode power regulation of the original clone with a proper linear regulator, plus the DB25 connector was replaced with an IDC connector. 

![Rev.0 assembled](pics/rev_0_assembled.jpg)

### Support

If you wish to support me in building new hardware and software for old machines, [throw a few euros in my direction via Ko-Fi](https://ko-fi.com/hkzlab) ☕!

## Hardware

The board was designed with [KiCad](https://kicad.org/) EDA.

### Bill of Materials

| Component              | Qty | Type / Value                                            | Notes                                                                |
| ---------------------- | --- | ------------------------------------------------------- | -------------------------------------------------------------------- |
| U1                     |  1  | 29F010/29F020/39SF010/39SF020... DIP-32                 | Either install this **or** U4                                            |
| U4                     |  1  | 29F010/29F020/39SF010/39SF020... PLCC-32                | Either install this **or** U1                                            |
| U2                     |  1  | GAL16V8 (tested 16V8B) DIP-20                           | Either install this **or** U7                                            |
| U7                     |  1  | GAL16V8 (tested 16V8B) PLCC-20                          | Either install this **or** U2                                            |
| U3                     |  1  | 74F245 DIP-20                                           | Either install this **or** U5                                            |
| U5                     |  1  | 74F245 SOP-20                                           | Either install this **or** U3                                            |
| J2                     |  1  | 2x10 2.54mm pinheader                                   |                                                                      |
| T1                     |  1  | 78L05 TO-92                                             |                                                                      |
| SW1                    |  1  | SPDT switch                                             | 3 pins. The pitch between the pins is roughly 2.8mm, [These](https://www.aliexpress.com/item/1005002278097696.html) or [these](https://www.aliexpress.com/item/1000007042312.html) can probably be adapted|
| R1                     |  1  | 10K resistor, either THT or SMD (1206)                  |                                                                      |
| C1, C2                 |  2  | 100nF/16V capacitor, either THT or SMD (1206)           |                                                                      |
| C3                     |  1  | 470nF/16V capacitor, either THT or SMD (1206)           |                                                                      |
| J1                     |  1  | 68pin PlayStation PIO port connector                    | Solder this on the opposite side of the board in respect to other components. You can use [this](https://store.phenommod.com/?product=pio-connector) ready made connector, or adapt [this](https://eu.mouser.com/ProductDetail/571-1-1734101-7) by dremeling away the extra plastic at the side |

Remember to program the GAL with the provided JED file.

### Pinout

```
External I/O
.----.----.----.----.----.----.----.----.----.----.
|  2 |  4 |  6 |  8 | 10 | 12 | 14 | 16 | 18 | 20 |
'----'----'----'----'----'----'----'----'----'----'
|  1 |  3 |  5 |  7 |  9 | 11 | 13 | 15 | 17 | 19 |
'----'----'----'----'----'----'----'----'----'----'

1,3,5,7,9,11,13,15,17,19 - GND
2,4,6,8,10,12,14,16 - D0 through D7
18 - Strobe
20 - ACK
```

### Ordering the boards

You can order the board for this project at [PCBWay](https://www.pcbway.com/project/shareproject/PlayStation_Datel_Cheat_cart_clone_5cc4dc4a.html) and support me or download 
the gerbers and have them printed wherever you like!!!

## 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.

### Memory map and protocol

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:

```
  1F000000h-1F01FFFFh R/W Flash (first 128K)
  1F020010h           R   Comms Link STB pin state (bit0)
  1F020018h           R   Switch Setting (bit0: 0=Off, 1=On)
  1F040000h-1F05FFFFh R/W Flash (second 128K)
  1F060000h           R   Comms Link data in (byte)
  1F060008h           W   Comms Link data out (byte, pulses ACK to Comms Link)
```

### 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. Interestingly, while connected, the A20 line seems to be ignored in all the calculations performed by this PLD.