Technical Specifications

Overview of the VMU's hardware features

Component	Description
CPU	Sanyo LC86K87 (Custom LC8670)
	8-bit Processor Words
	9-bit Data Address Space
	16-bit Instruction Address Space
Clocks	32.768 kHz Quartz Oscillator
	879.236 kHz RC Oscillator
	6 MHz CF Oscillator
RAM	Bank 0: 256 bytes reserved for system BIOS
	Bank 1: 256 bytes for applications
WRAM	Extra 512 bytes "Work RAM"
	Doubles as Maple Transfer Buffer (when connected to Dreamcast)
ROM	Firmware: 4KB
	System BIOS: 16KB
XRAM	Framebuffer: 2x128-Byte Banks
	Icon Storage: 1x128-Byte Bank
Flash	128KB Total, 8-bit FAT filesystem
	200 User Blocks @ 512 bytes/block
Power	2xCR2032 Batteries (standalone mode)
	5v input pin (connected to Dreamcast)
Display	48x32 Dot Resolution, monochrome LCD screen
	37mm (1.46 in) x 26mm (1.02 in) size
Sound	Piezoelectric Buzzer
	1-channel 8 or 9-to-16 bit PWM source
Input	4-Button Directional-Pad
	A, B, MODE, Sleep Buttons
Timer	Base Timer (14-bit up counter)
	2xTimer Circuits (16 or 8-bit timer/counters)
Serial	Dedicated Maple Interface (VMU-to-Dreamcast connectivity)
	2-Channel Synchronous 8-bit Serial (VMU-to-VMU connectivity)