8Bit-Homecomputermuseum

Retrocomputer, Heimcomputer und Videospiele der 80er

BBC Model B repair...

Here is my attempt to repair an BBC Model B 
This BBC displayed wrong characters in mode 7 (and only in mode 7). First i thought it could be the Teletextcharactergeneratorchip.

The guys at stairwaytohell showed me the right direction: a 74LS273 latch which holds the character code was bad!

Socketed and replaced (luckily i had one in my sparebox).

=> BBC works perfect again!

Autor: Thomas Gutmeier