kens@ISM780.UUCP (10/29/85)
My experience with the V20 is that it speeds things up about
4-7%. It's nice to have the 186 instruction set if you're an
assembly language programmer, and may come in handy if you have a
CP/M fetish or other sad perversion, but don't anybody believe
the "10-40%" nonsense that you see bandied about in the ads. I
just put my V20 in and here are some preliminary informal results
with my 320k/10mb XT:
8088 V20
Recalculate 256x27 spreadsheet 10.1sec 9.4sec
(SuperCalc 3 rel 2.1)
825 Line Turbo compile from disk 13.6sec 12.8 sec
Lattice Compile (drystone.c) 1:14 1:09
MASM 1.25 ~1200 lines 58.7 55.5
Non-scientific, but indicative that the speedup is pretty
negligible.
However, what can you expect for $16? And it does seem to work without
glitches on everything I've tried so far.
Ken Sarno
INTERACTIVE Systems Corp.
...!decvax!vortex!ism780!kensjnw@mcnc.UUCP (John White) (11/21/85)
> > My experience with the V20 is that it speeds things up about > 4-7%. It's nice to have the 186 instruction set if you're an > assembly language programmer, and may come in handy if you have a > CP/M fetish or other sad perversion, but don't anybody believe > the "10-40%" nonsense that you see bandied about in the ads. I got about 11% more dhrystones when I switched from a 8088 to a V20. This is worth the price. I suggest using the 8Mhz part rather than the 5Mhz part. I have heard that the duty cycle on the V20 clock is different so with a 5Mhz V20 in a PC the specs won't be met.
timothym@tekigm2.UUCP (Timothy D Margeson) (11/23/85)
Hi, About the NEC V20 and V30 chips... I have a Compaq Deskpro computer in which I installed a V30 (the standard device is an 8Mhz 8086). The time/benchmarks I ran indicated an average improvement of 8%. No this is not an astonishing improvement, however an improvement I could not test, nor did I expect, was the increase in speed when accessing the display adaptor. When my machine updates then screen in Turbo Pascal, Framework, Multimate or even Crosstalk, I've gained at least 30%, probably more in efficiency. What this relates to is when you are pageing through files in an editor, you are not waiting for the screen to update nearly as much as with the 808X family. I also put a V20 into my brothers PCjr. With Turbo Pascal, and IBM's Display Writer editors, similar, if not better results were obtained. If you have a PCjr, put a V20 in it, it will be worth it! By the way, in neither case has there been any sign of incompatibilities. And I feel Framework II (with SuperLOK copy protection) is as good a test as any. Hope someone reading this finds it of interest. -- Tim Margeson (206)253-5240 tektronix!tekigm2!timothym @@ 'Who said that?' PO Box 3500 d/s C1-465 Vancouver, WA. 98665
john@hp-pcd.UUCP (john) (11/26/85)
<<<<< > > My experience with the V20 is that it speeds things up about > 4-7%. It's nice to have the 186 instruction set if you're an > assembly language programmer, and may come in handy if you have a > CP/M fetish or other sad perversion, but don't anybody believe > the "10-40%" nonsense that you see bandied about in the ads. > What some people tend to forget is that the V20 has the same 8 bit Data buss as the Intel 8088. The Execution unit may be 10-40% faster but that means that the processor finishes earlier and spends more time waiting for the Buss interface to fetch the next byte. If you want to evaluate the effect of the NEC Execution unit then you must compare the V30 with the I-8086. Doubling the speed of the portion of a system that is not the bottleneck does not double the speed of the system. John Eaton !hplabs!hp-pcd!john