MSX extensions (3) - eight-slot bus board

This third part in the series presents an MSX busboard to overcome the limitations of that single slot on the computer,• up to eight cartridges may be inserted and selected with keys or under software control. EXTENSIONS - 3 eight-slot bus board Any MSX user in possession of several cartridges must at some time have wished to be relieved of the cumbersome cartridge-exchange procedure: power off - remove car- tridge - insert cartridge - power on - test. Moreover, frequent cartridge exchanging may cause bad slot con- tacts after a while. Note that not all cartridges have an insert/remove protection fitted, so that it is sensible to always switch off computer power before exchanging any cartridges; it is better to be on the safe side! The present eight-slot MSX busboard offers an interesting solution to these problems, because cartridges are now constantly available to the user; he need only issue a slot (i.e. cartridge) select in- struction in MSX BASIC or press a single k...