MAD-1 Pinout

"MAD-1" Stands for "Memory Address Decoder 1". It is used for Memory Mapping / Address Decoding in HiROM and LoROM Cartridges and Controls the Power for Save RAM.

       .---\/---.
/HS <- | 01  16 | -> /LS
/SR <- | 02  15 | <- A15 (LoROM); A13 (HiROM)
 NC -- | 03  14 | <- PA4 (LoROM); A14 (HiROM)
/RS <- | 04  13 | <- PA5
SVC -- | 05  12 | <- VCC / PA6 (LoROM); A15 / BA6 (HiROM)
VCC -- | 06  11 | <- /ROMSEL
BAT -- | 07  10 | <- MSEL
GND -- | 08  09 | <- /RST
       `--------´

• /HS: When Using 2 ROM Chips, this Selects the Upper One
• /LS: this Selects the Lower One
• MSEL: Connected to GND in LoROM; to VCC in HiROM
• BAT: Voltage from Battery
• SVC: Voltage to Save RAM
• /RS: /CS for Save RAM
• /RS: /CS for ROM Chip
• /RST: Reset from Cartridge