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SHVC-1A3B-20

A board with a single rom chip, a 74LS139 chip and 64k of RAM

All PCB information based on a document by Overload

Supported ROM sizes

  • 2 Mbit
  • 4 Mbit
  • 6 Mbit
  • 8 Mbit
  • 16 Mbit

Supported RAM sizes

  • 64 kbit

On-board chips

Chip numberChip type
U1ROM
U264K SRAM
U374LS139
U4CIC

ROM Registration

A properly formatted internal header should have these values

Memory Address Value Explanation
FFD520H / 30HMap Mode
FFD602HCartridge Type
FFD708H ~ 0BHROM Size
FFD803HRAM Size

Memory Mapping

In order to get a game to work properly on an emulator, the following mapping should be used for this PCB.

Bank Address Usage
00-1F8000-FFFFROM
70-7F0000-FFFFRAM
80-9F8000-7FFFROM (MIRROR)
F0-FF0000-7FFFRAM (MIRROR)

Games that use this PCB type:

Game Name Region Serial Code
Super Keiba Japan SHVC-KB-0
Mystic Quest Legend PAL SPAL-MQ-0
Soul Blazer PAL SPAL-SO-0
Super Mario All-Stars PAL SPAL-4M-0
Ken Griffey Jr. Presents Major League Baseball USA SNS-JR-0
SimEarth: The Living Planet USA SNS-SE-0
Super Mario All-Stars USA SNS-4M-0

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