Wuite possibly. But WIndows was sold as an HP product for the HP150 (I have it, original disks and manual). No (in fact you could say it's the reverse, the HP150 always has the touchscreen, on the 150-II it's an option). The 150-II is quite different from the 150. It's in an almost cubical case with a tilting CRT (like some of the later HP termninals). The CRT is 12" (the 150's is 9") It has 4 vertically-positioned expansion slots (the 150 has 2, horizontally positioned). The 150-II uses HP-HIL for the keyboard and touchscreen (and you can add a mouse on HP-HIL too). There is no optional intenral printer on the 150-II. It has a power output socket for the 9123 diosk drive. It can officially take an 8087 coprocrssor card [1]. I have an idea there are even a few software incompatabilities between the 150 and 150-II Electronically it's a complete redisign, with a lot more custom chips than a 150. [1] What a kludge. The 150-II has an 8088 on the mainboard, used in 'minimum mode', which means some of the coprocessor signals are not available. The coprocessor card contains an 8088 in 'maximum mode', the 8087 and some interface logic. It disables the 8088 on the mainboard.... -tony

The trivial anwaer is 'to add a maths coprocessor' :-) My inital thoguth was that the machine was designed without thinking of the comprocessor, so the 8088 was used in minimum mode. Since that can't support a coprocoessor, and since the changes to the interface logic between the 8088 and the system buses are considerable if you change it to maximum mode, the only sane thing to do is to put another 8088 on the card, run that in maximum mode, add the logic too, and disable the one on the mainboard so that the 8088 on the coprocessor card takes over. The only problem with that theory is that all 150-IIs have the coprrocessor board connector. IMHO it would have been simpler to put the logic on the mainboard, run that 8088 in maximum mode, and just have a socket for the 8087 (like on an IBM PC). Another explanationg that breaks down is that they wanted to keep the circuitry from the origianl 150 (which never officially accepted a coprocessor). Problem with that idea is that so much of the machine was redesigned going to the 150-II, it would have been easy to redesign this bit too. Who knows? Incindentally, doea anyone (else) have an HP150-II with na Elmer board? The story of that is that one of the gate arrays -- codenamed Elmer -- wasn't finished in time, so early machines have a PCB containing standard chips (real time clock, baud rate generator, TTL for the handsahke line ports, etc) in place of it. It's the same sort of size as the 8087 board, and fits alongside it (standing vertically). -tony