Another one of CBM's glorious disasters, the CBM 264 series Plus/4 was essentially the same as the also ill-fated C16 but contained.....wait for it.....4 built-in applications. Hence the name. It was equally as compatible with everything else as the C16, ie not at all, and didn't sell too well, unsurprisingly. 95% of the Plus/4s I've picked up have all been very dead since their most common failing was the TED chip which controlled the video. The other bad component was the CPU, and of course the only place to get replacements is another Plus/4.....