Yamaha YIS503

Home personal computer

Yamaha YIS 503 MSX computer

1983 (Dec.)
Initially sold for ¥64,800

The Yamaha YIS 503 is a stripped down CX5M aimed at the home computer market. It comes in silver, retains the "YIS" name Yamaha once envisioned for its ecosystem built around the PU1 and doesn't have any SFG module preinstalled.

It's unclear whether at this stage Yamaha was still selling the original YIS line or the advent of MSX computers wiped away any previous model.

Yamaha YIS503 advertisement
Yamaha YIS503 advertisement
Yamaha YIS303/503 brochure
Yamaha YIS303/503 brochure
Yamaha YIS503 detail
Yamaha YIS503 detail
YIS503 with the YK01 keyboard and the PN01 printer
YIS503 with the YK01 keyboard and the PN01 printer

Technical
specifications

Computer

MSX BASIC v1.0
3.58 MHz Zilog Z80 CPU
32 kb (up to 64 kb) RAM, 16 kb VRAM, 32 kb ROM

Connection terminals and interfaces

Cartridge slot
Expander port
Printer connector
Joystick port 1, Joystick port 2
Tape interface
Video RF output, video composite output

Documents