blf@wookumz.ai.mit.edu (Bill Frandsen) (03/19/91)
For Sale: --------- CMI (Creative Microsystems Inc.) Processor Accelerator Consists of a PC board with a 16MHz 68000 chip, and a 16MHz 68881 math coprocessor with crystal. To install, you simply remove the 7MHz 68000 from your Amiga 2000 (only) and instal this board in it's place. The board runs at either the regular 7.14MHz for full compatibility, or at 14.28MHz for improved performance. Software is included to switch between both speeds at will. A jumper is also provided to force the board to boot at either speed. (I usually ran the board at 7MHz at boot time, and ran the PA program in the startup sequence to install the math chip and run at 14MHz). A disk full of software (useful and demo) is included. Note: The CMI company is now out of business, but I have been told thru USENET that the company DigiF/X or something like that is now handling the support of the board. Also, due to a problem with certain DMA devices, the board will not work at 14MHz with the Bridgeboard. The speed must be set at 7MHz before it will work with the Bridgeboard. (Supposedely this can be fixed by cutting a trace on the PA board, call this DigiF/X company to find out how) The real speedup is about 10% for most programs like LHARC/ZOO that can be measured. Speed up for specific programs that can use the ffp.library are in the range of 20 times! (A demo included runs at 50 seconds with 7Mhz, and 2 seconds with the 14MHz math coprocessor installed). However, most programs do not access this library. Below is the information provided by Kramden SI 2.0b: System Information v2.0b Kramden Utilities (c) 1988,1989 Pregnant Badger Software Main Processor: Motorola 68000 Math Peripheral: Motorola 68881 Computing Performance relative to: A1000 IBM/XT Integer: 1.8 5.9 Floating Point: 3.2 24.2 Reason for selling: Getting a much faster (more expensive) accelerator! Price: $100 US Dollars, which I will include shipping to anywhere in the continental United States. (US Postal Service Priority Mail). Terms: Check or money order. I will ship upon receipt of payment. Contact: blf@churchy.ai.mit.edu