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Japanese SMS Cartridges
This page provides some basic info about Japanese SMS cartridge's hardware and contains schematics of selected circuit boards. List of games using these boards is not final.
171-5589D
| Games: | After Burner (アフターバーナー) |
| Game size: | 4Mbit (512KByte) |
| Board version: | I. |
| Board number: | 171-5589D |
| ROM numbers: | MPR-11272 MPR-11273 |
| Mapper used: | 315-5235 |
This Japanese SMS/Sega Mark III game cartridge board contains 315-5235 mapper chip and two custom 40-pin 16-bit ROM chips (128Kx16) in "byte mode" to make them 512KB in total, unlike it's US and European counterpart which contains only one 8-bit ROM chip (512Kx8). The ROMs have the first and second halves of the data respectively. Their CE pins are connected to CE1 and CE2 on the 315-5235 to enable them, rather than CE0.
 |  |  |
| Front side of the PCB | Desoldered ROM chips | Bottom side of the PCB |
| (ROMs desoldered) | (MPR-11273 & MPR-11272) | (ROMs desoldered) |
Here is a complete board's schematic drawn by Enri (keep in mind that the SMS cartridge connector description is different than the one here so refer to author's original description ):
References
Forum topic - After Burner (JP) with split ROM
171-5439 & 171-5440
| Games: | Space Harrier (スペースハリアー) | Out Run (アウトラン) | ||
| Game size: | 2Mbit (256KByte) | |||
| Board version: | I. | II. | ||
| Board number: | 171-5439 | 171-5440 | ||
| ROM numbers: | MPR-10410 MPR-10411 | MPR-10412 | ||
| Mapper used: | 315-5235 | |||
This Japanese SMS/Sega Mark III game cartridge board has two known board versions.
The first one contains 315-5235 mapper chip and two custom 28-pin 8-bit ROM chips (128Kx8). The ROMs have the first and second halves of the data respectively. Their CE pins are connected to CE1 and CE2 on the 315-5235 to enable them, rather than CE0.
The second board version has only one 40-pin 16-bit ROM chip (128Kx16).
171-5439's PCB scan
171-5440's PCB scan
Complete board's schematic drawn by Enri:
 |  |
| 171-5439 | 171-5440 |
171-5363 (-01)
| Games: | The Pro Yakyuu - Pennant Race (ザ・プロ野球 ペナントレース) and many more... | |
| Game size: | 1Mbit (128KByte) | |
| Board version: | I. | |
| Board number: | 171-5363-01 (Type F) | |
| ROM numbers: | MPR-10749 | |
| Mapper used: | 315-5208 | |
This Japanese SMS/Sega Mark III game cartridge board contains 315-5208 mapper chip and one custom 28-pin 8-bit ROM chip (128Kx8).
Complete board's schematic drawn by Enri:
