Mitsubishi MELPS 4
Developer	Mitsubishi
Manufacturer	Mitsubishi
Type	microcontrollers
Production	1978
ISA	MELPS 4
Word size	4 bit 0.5 octets 1 nibbles
Technology	pMOS, CMOS
Clock	100 kHz-600 kHz
Package	DIP28, DIP40, DIP42, DIP64, QFP68, QFP72

The MELPS 4 was a family of 4-bit microcontrollers developed by Mitsubishi and introduce in March of 1978. Originally designed using pMOS technology, a second chip MELPS 41 (and later MELPS 42) was designed using CMOS technology.

Design

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ISA

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Members

Family Members
Part	ROM	RAM	Frequency	I/O Ports	Package	Notes
M58840	2048x 9-bit	128x 4-bit	300 kHz - 600 kHz	25	DIP42	incorporates a A/D converter
M58841	2048x 9-bit	128x 4-bit	300 kHz - 600 kHz	25	DIP42	Identical to M58840, except separate RESET (pin 20)
M58842S		128x 4-bit	300 kHz - 600 kHz	25	DIP64	MELPS 4 System Evaluation Device (external ROM)
M58843	1024x 9-bit	64x 4-bit	300 kHz - 600 kHz	23	DIP28
M58844	1024x 9-bit	64x 4-bit	300 kHz - 600 kHz	36	DIP40	Same as M58843, more I/O
M58845	2048x 9-bit	128x 4-bit	300 kHz - 600 kHz	31	DIP42
M58846	2048x 9-bit	128x 4-bit	300 kHz - 600 kHz	31	DIP42
M58847	2048x 9-bit	128x 4-bit	240 kHz - 400 kHz	22	DIP40
M58494	4096x 10-bit	32x 4-bit	100 kHz - 455 kHz		QFP68, QFP72	"MELPS 41"
M58496	2048x 10-bit	128x 4-bit	250 kHz - 525 kHz	28	QFP72	"MELPS 42"
M58497	2048x 10-bit	128x 4-bit	120 kHz - 260 kHz	28	QFP72	"MELPS 42"

Others

Part	Description
PCA0401	single-board system-evaluation computer for M58840

Software Support

No	Language	Name
GBIASOOO1	FORTRAN	MELPS 4 Cross Assembler-MELCOM 70
GBIASOO02	FORTRAN	MELPS 4 Cross Assembler-MELCOM 7000 or COSMO 700
GBISMOOO1	FORTRAN	MELPS 4 Simulator-MELCOM 70
GBISPOOO1	FORTRAN	MELPS 4 Paper-Tape Generation Program for PROM writer-MELCOM 70
GBISPOO02	FORTRAN	MELPS 4 Paper-Tape Generation Program for PROM Writers-MELCOM 7000 and COSMO 700
GBIASOO03	FORTRAN	MELPS 41 Cross Assembler-MELCOM 70
GBISMOO02	FORTRAN	MELPS 41 Simulator-MELCOM 70
GBISPOO03	FORTRAN	MELPS 41 Paper-Tape Generation Program for PROM Writers-MELCOM 70

Documents

• MELPS 4 (1982)
• MELPS 41/42 (1982)

See also

• Mitsubishi M350xx
• Mitsubishi M50430/M50440
• Mitsubishi M50460/M50560
• Mitsubishi M5072/M5076
• Mitsubishi M5090 (4-bit)

• Mitsubishi M37409 (8-bit)
• Mitsubishi M58850 (8-bit)

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