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Last modified 2026-01-30

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BBC Micro Model B+128

A picture of BBC Micro Model B+128

SPECIFICATIONS

GENERAL
Type:8-bit home computer
CPU:Rockwell R6512A @ 2 MHz
Operating system(s):Acorn MOS
Memory:ROM: 48 KB
RAM: 128 KB
Power supply:
Current drain / power consumption:
Dimensions (W*H*D):? mm (?")
Weight:? Kg (? lb)




I/O
Keyboard:Integrated
Graphics: Motorola 6845 CRT controller and Mullard SAA5050 teletext chip
Text:
Mode 3: 80*25 characters, 2 colors
Mode 6: 40*25 characters, 2 colors
Mode 7: 40*25 characters (Teletext), 8 colors
Graphics
Mode 0: 640*256 pixels, 2 colors
Mode 1: 320*256 pixels, 4 colors
Mode 2: 160*256 pixels, 8 colors
Mode 4: 320*256 pixels, 2 colors
Mode 5: 160*256 pixels, 4 colors
Audio: SN76489 chip
4 channels (1 noise, 3 melodic)
Optional speech synthesis with the TMS5220 and TMS6100 chips
Storage: Tape recorder (300/1200 bd)
Optional floppy and hard drives
External I/O ports:
RGB out:   ?
Video out:   ? (Composite)
RF out:   ? (PAL only)
Tape I/O:   ?
RS-423 port:   ?
Parallel port:   ? (Centronics)
User port:   20-pin
Analog I/O port:   ?
1 MHz expansion port:   ?
External 2nd CPU connector:   ?-pin ("The Tube")
Other:




MISCELLANEOUS
Manufactured:1985-19xx (Discontinued)
Additional info:
Related documents:
Modifications and fixes:
Notable "ham" software:
Reviews:
Some options / Accessories:
? Econet network interface (100 KBit/s)