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96 lines
6 KiB
Markdown
96 lines
6 KiB
Markdown
# PS1 Power Replay Datel clone - RE Notes
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## DISCLAIMER
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Any use of this project is **under your own responsibility**.
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You will be responsible of checking the correct construction and functionality of your board.
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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.
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## Introduction
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This board is a reconstruction (with a few improvements) of a clone of a Datel cheat cart for PlayStation.
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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.
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This device can be used with the original (provided) EPROM dump, or with [unirom](https://unirom.github.io/).
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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.
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### Support
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If you wish to support me in building new hardware and software for old machines, [throw a few euros at me with Ko-Fi](https://ko-fi.com/hkzlab) ☕!
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## Hardware
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The board was designed with [KiCad](https://kicad.org/) EDA.
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### Bill of Materials
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| Component | Qty | Type / Value | Notes |
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| ---------------------- | --- | ------------------------------------------------------- | -------------------------------------------------------------------- |
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| U1 | 1 | 29F010/29F020/39SF010/39SF020... DIP-32 | Either install this **or** U4 |
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| U4 | 1 | 29F010/29F020/39SF010/39SF020... PLCC-32 | Either install this **or** U1 |
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| U2 | 1 | GAL16V8 (tested 16V8B) DIP-20 | Either install this **or** U7 |
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| U7 | 1 | GAL16V8 (tested 16V8B) PLCC-20 | Either install this **or** U2 |
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| U3 | 1 | 74F245 DIP-20 | Either install this **or** U5 |
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| U5 | 1 | 74F245 SOP-20 | Either install this **or** U3 |
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| J2 | 1 | 2x10 2.54mm pinheader | |
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| T1 | 1 | 78L05 TO-92 | |
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| 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|
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| R1 | 1 | 10K resistor, either THT or SMD (1206) | |
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| C1, C2 | 2 | 100nF/16V capacitor, either THT or SMD (1206) | |
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| C3 | 1 | 470nF/16V capacitor, either THT or SMD (1206) | |
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| 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 |
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Remember to program the GAL with the provided JED file.
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### Pinout
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```
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External I/O
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.----.----.----.----.----.----.----.----.----.----.
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| 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 |
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'----'----'----'----'----'----'----'----'----'----'
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| 1 | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 17 | 19 |
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'----'----'----'----'----'----'----'----'----'----'
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1,3,5,7,9,11,13,15,17,19 - GND
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2,4,6,8,10,12,14,16 - D0 through D7
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18 - Strobe
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20 - ACK
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```
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### Ordering the boards
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You can order the board for this project at [PCBWay](https://www.pcbway.com/project/shareproject/TODO.html) and support me or download
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the gerbers and have them printed wherever you like!!!
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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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### 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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### 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. Interestingly, while connected, the A20 line seems to be ignored in all the calculations performed by this PLD.
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