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Sega Pico Plug-in adapter is the latest addition to the Retrode family

Pico Adapter

Pico Plug-in adapter

crazy2001 over on the www.arcadezentrum.com forums has been hard at work. Knowing that the Sega Pico was based on the Megadrive, he set out to make a plug-in adapter to read the Pico ‘books’ on his Retrode. He was kind enough to send over some instructions on how to build one:

Retrode Sega PICO Plug-in adapter

A Sega “PICO” to “MEGADRIVE” Adapter is pretty easy, as both Systems are basically the same! The Cartridges only have a different PIN-Layout! The Retrode even recognize the RomSize and the RomName…as it would be with a Megadrive-cartridge!

So for an adapter you need the following stuff:

  1. A PICO console (the Pinout of the PICO-Cartridges is unique), where you can de-solder the Cartridge-SLOT
  2. A Megadrive cartridge (I used SONIC – THE HEDGEHOG)
  3. Wires
  4. Solder
  5. Electrical tape
  6. A Multimeter (not really needed, but nice to have sometimes)

Instructions:

  1. Open the Sega PICO console and desolder the cartridge-slot. I used a hotair-gun for that!
  2. Open the Megadrive cartridge, desolder everything from the PCB (Eeproms,…)
  3. Now solder some wires between the pins of the megadrive-cartridge and the pins of the Pico-cartridge-slot as you see below!
  4. PICO - Megadrive        | Description
    ------------------------------------
    01   -  A16             | A17
    02   -  A14             | A16
    03   -  A12             | A15
    04   -  A10             | A14
    05   -  A08             | A13
    06   -  A06             | A12
    07   -  A04             | A11
    08   -  B05             | A10
    09   -  B04             | A9
    10   -  B08             | A20
    11   -  B09             | A21
    12   -  B07             | A19
    13   -  B06             | A18
    14   -  A03             | A8
    15   -  A05             | A7
    16   -  A07             | A6
    17   -  A09             | A5
    18   -  A11             | A4
    19   -  A13             | A3
    20   -  A15             | A2
    21   -  A17             | A1
    22   -  B17             | CE (CAS0)
    23   -  A01             | GND
    24   -  A18             | GND
    25   -  B16             | OE(IC11#8*)
    26   -  A20             | D0
    27   -  A21             | D8
    28   -  A23             | D1
    29   -  A24             | D9
    30   -  A26             | D2
    31   -  A27             | D10
    32   -  A29             | D3
    33   -  A30             | D11
    34   -  A31             | VCC
    35   -  A28             | D4
    36   -  B25             | D12
    37   -  A25             | D5
    38   -  B24             | D13
    39   -  A22             | D6
    40   -  B23             | D14
    41   -  A19             | D7
    42   -  B22             | D15
    43   -  A32             | GND
    44   -  A32             | GND
    45   -  B19             | CLK
    46   -  A02             | VCC
    47   -  Not Connected   | SRAM(IC17#7*)
    48   -  Not Connected   | LWR
    49   -  Not Connected   | MRES
    50   -  A02             | VCC
  5. Put everything back, as good as possible, into the Megadrive-cartridge and use some electrical tape to fix everything!
  6. Have fun with playing the games!

Pictures:

PICO cartridge PCB Pico Adapter in the Retrode Reading the Pico cartridge

Source: www.arcadezentrum.com forums [German].

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2 comments to Sega Pico Plug-in adapter is the latest addition to the Retrode family

  • Muzer

    Nice! I also note that, according to the forum (with a little help from Google Translate ;)), there aren’t actually dumps of most Pico books, which makes it even better.