Path: utzoo!utgpu!news-server.csri.toronto.edu!qucdn!leek Organization: Queen's University at Kingston Date: Wednesday, 24 Apr 1991 21:42:47 EDT From: Message-ID: <91114.214247LEEK@QUCDN.QueensU.CA> Newsgroups: sci.electronics Subject: Re: microprocessor wanted References: <119279@unix.cis.pitt.edu> In article <119279@unix.cis.pitt.edu>, fmgst@unix.cis.pitt.edu (Filip Gieszczykiewicz) says: > > Greetings. > > I need a microprocessor with the following specifications: > > o 8-bit (16-bit would be nice) > o ~10MHz clock > o ability to address 64K of RAM (more would be nice) > o BUILT-IN floating processor (that's the problem) > o CHEAP (under $40) Closest match is a 10MHz 68000. Cost $10. Hook it up with a 68881 floating point unit. I paid $50 for a new 20MHz chip from a mail order place, so a slower one might be cheaper. Mind you that the 68000 does not have a coprocessor interface, but can emulate that in software. The 68881/882 manual has a section on that. Cost:~$60 you get 16/32 bit uP, 16M addressing space, 10MHz CPU, 20MHz FPU... > Anyone? If not, I would like to use the 8086/8087/glue and Doesn't that cost > $40 per pair ? You could have a 16Mhz 68020 and 20Mhz 68881 for $100 and they are much faster than 8086/8087. The 68881 have more trig. functions too. > put them on a small module that I can use as a "chip". > I want 16 of these "chip"s to fit on one board (that's why > I worry about space) How much space per "chip" ? You could stack a second board, couldn't you ? I think I can fit the 020/881 onto a 2" by 4" space - slightly bigger than 8086/8087/glue. > P.S. I have yet to see a uP that does the above :-( Price is the only barrier left... However if you relax the floating point part, you can get microcontrollers well below $40. >"The Force will be with you, always." It _is_ with me and has been for 11 >years >Filip Gieszczykiewicz "... a Jedi does it with a mind trick... " ;-) >FMGST@PITTVMS or fmgst@unix.cis.pitt.edu "My ideas. ALL MINE!!" K. C. Lee Elec. Eng. Grad. Student P.S. for the chef/priest/student/chip designer/PC user etc in you... "May the sauce/cross/course/MOS/DOS/... be with you !!" :)