From BASIC-G Manual[1983/3]

Memory map

Memory bank

ROM

0000h-5FFFh

RESERVE

6000h-6FFFh

RAM

7000h-FFFFh

Detailed Memory map

0000h - 1FFFh	M5 MONITOR (Internal ROM 8KB)
2000h - 3FFFh	External ROM Cartride (MAX 16KB)
6000h - 6FFFh	Reserve Area
7000h - 7FFFh	Internal RAM (4KB)
8000h - FFFFh	External RAM Cartride (MAX 8KB) or 32K Expand Box (MAX 32KB)