MZ 721

MZ 721 - 01
The Sharp MZ 700 series replaced the aging MZ 80
(MZ 80K, MZ 80A and MZ 80B) series.
Moreover, the MZ 700 was compatible with the MZ 80K and MZ 80A. 

The MZ 700 series is composed of four machines:
the first three models were launched in 1983 (November 1982 in Japan)
and the last one was launched in late 1985 
(in fact, this one is the "ancestor" of the MZ 800): 

- the MZ 711 was the "naked" model (without any peripheral),
- the MZ 721, has an integrated tape recorder
- the MZ 731, has built-in plotter and tape recorder).
- the fourth model was the MZ 780 which was actually a MZ 731 with a
  80 columns card, a floppy disk drive and a Centronics port.
  It worked under CP/M. 

There was no language in ROM (the ROM size is only 2 KB, it is just
used for boot and OS calls), it has to be loaded from tape.
So there was a lot of languages adapted for this machine
(more than five versions of BASIC, assemblers, Pascal, Lisp, C, Fortran,
Comal, Forth, & others). 

The games were a bit poor because of the low resolution 
(which was actually graphical characters), but there were 512 graphic
characters in ROM, which can be used to offset it (sort of). 

It will be replaced with the MZ 800. 


Manufacturer Sharp Name MZ 721
Type Home Computer Origine Japan
Introduction Date 1983 End of production ???
Built in Language None Keyboard
CPU Sharp LH-0080 (Zilog Z80 A compatible) Speed 4 Mhz
Coprocessor - Amount of Ram 64 Kb
Vram 2 Kb Rom 2 Kb
Text Modes 40 x 25 Graphic Modes 50 x 80
Colors 8 Sound one channel, 3 octaves
Size / Weight ?? Built in Media Tape recorder
I/O Ports Parallel, Joystick (2), Z80 Bus, Tape, RGB OS Various
Power Supply Internal Introduction Price about 533 (1983)
Sold ??? Serial Number ???
Other Extras Boxed, manual, Casettes Bought Where Ebay
Bought When 28/03/2003 Condition Good
Price Paid 42.40 Specs of my Model -
Setup Today ???

Nicely Boxed The MZ721

Back View Serial Number


Bought on ebay (28/03/2003).
Paid 34.40 + 8 shipping costs