Jim.Priestle@afitamy.fidonet.org (Jim Priestle) (02/07/90)
As I remember, the miget racer useing a 7mhz 68020, so speed is not increased
much. But, the 68020 allows a 68881 and that does help for programs that use
the math libraries. There was a benchmark thingy in July 89 AmigaWhirled that
shows many operations SLOWER than the 68000, but turbo silver, which has a
68881 version, clocked in a little more than twice as fast. -jim-
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\// 1:110/300 brianm@sco.COM (Brian Moffet) (02/09/90)
In article <58.25D00280@afitamy.fidonet.org> Jim.Priestle@afitamy.fidonet.org (Jim Priestle) writes: >As I remember, the miget racer useing a 7mhz 68020, so speed is not increased >much. But, the 68020 allows a 68881 and that does help for programs that use >the math libraries. There was a benchmark thingy in July 89 AmigaWhirled that >shows many operations SLOWER than the 68000, but turbo silver, which has a >68881 version, clocked in a little more than twice as fast. -jim- Thought I would comment on this as I just recently put one of these into my amy 1000. My configuration is: Amy 1000 (bought Jan 1986) CSA Midget Racer with 68020 @ 7 Mghz 68881 at 16 Mghz (seperate clock for 68881) Supra 4x4 SCSI Interface Microbotics Starboard II So far no problems, after I found that I couldn't use blind reads/writes on my hard disk anymore. I have noticed only small improvements in 680x0 speed, mostly due to the 256 byte instruction cache in the 68020. This is good for small tight loops. However, I have been consistantly getting from 11 to 16 times the performance with the 68881. No real hard numbers, (ie no benchmarks), but a mandelbrot program that I wrote took 45 minutes without the FPU, and 4 minutes with. The only hardware mods I have had to make to get my combo to work is I grounded the PALS just because people kept blaming them for somethings that were obviously not. IE I was tired of people using the PALS as a scapegoat. The Supra 4x4 seems to clean up the problems with the microbotics StarBoard II fairly well. However, I almost never shut my machine down, but rather it is always running. My conclusion is, the CSA seems to work quite well with *my* system. The FPU is fantastic. Lattice C 5.0.2 (basicaly the 5.0 with bug fixes) generates the FPU code (-f8 option) and seems to work just fine. Just FYI. brian moffet