MB8840/MB8840H Family
Developer	Fujitsu
Manufacturer	Fujitsu
Type	microcontrollers
Production	1977-1992
ISA	MB8850
Word size	4 bit 0.5 octets 1 nibbles
Technology	nMOS
Clock	1.0 MHz-6.0 MHz
Package	DIP42, DIP28, QFP48

The MB8840/MB8840H series is a family of 4-bit nMOS microcontrollers developed by Fujitsu and introduced in 1977^[off?]. This series was very popular for arcade games (e.g. some Atari's Namco Galaga/Xevious systems). This series is architecturally identical to the MB8850 family (A CMOS version).

Members

The "H" versions are identical to their non-"H" counterparts but aimed to be "high performance", capable of operating at higher frequency (up to 8 MHz).

Family Members
Part	ROM	RAM	I/O Ports	Instructions	Notes
MB8841	2K x 8 bit	128 x 4 bit	37	70
MB8842	2K x 8 bit	128 x 4 bit	25	69
MB8843	1K x 8 bit	64 x 4 bit	37	70
MB8844	1K x 8 bit	64 x 4 bit	25	69
MB8845	2K x 8 bit	128 x 4-bit	37	70
MB8846	2K x 8 bit	128 x 4-bit	25	69
MB8847	1K x 8 bit	64 x 4 bit	37	70
MB8848	1K x 8 bit	64 x 4 bit	25	69

ISA

Main article: MB8850 ISA

The MB8840 has an identical ISA to that of the MB8850.

Documents

• MB8840 Datasheet

See also

• MB8850, a CMOS version
• MB88500, a higher frequency version