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From: schumann@puff.UUCP
Newsgroups: comp.sys.apple
Subject: Re: chess master 2000, etc.
Message-ID: <521@puff.WISC.EDU>
Date: Tue, 24-Feb-87 11:45:33 EST
Article-I.D.: puff.521
Posted: Tue Feb 24 11:45:33 1987
Date-Received: Fri, 27-Feb-87 01:29:05 EST
References: <8702231546.aa00774@SPARK.BRL.ARPA>
Organization: U of Wisconsin CS Dept
Lines: 33

In article <8702231546.aa00774@SPARK.BRL.ARPA>, ACTS5%VAXSWD@rca.com writes:
> speeking of speed...  Does anyone know offhand how fast
> 6502 instructions (as in ][+) take in microseconds?
> I believe that ][+'s have a 2 Mhz clock with half the
> time going to refresh the screen.
Not quite.  The Apple ][+ has a clock speed of 1.023 MHz, and half of the cycle
is used during memory and screen refresh, but this does not slow the 6502 at
all.  An LDA takes four cycles, or 3.91 microseconds.  On the 8085, a
Z-80-like cpu (no flames), it takes 13 cycles, or 3.25 mics. 18% diff!
You can get the 6502 or 65C02 data sheet from an electronics distributor.

> The question comes out of comparison between clones and
> apples.  I have heard that Mhz aren't the whole story
> because a ][+ is much faster that a 4Mhz TRS-80.
I think the TRS-80 uses interrupts, which slow it down, otherwise, it should
be pretty close.
> Does anyone have any info on 6502 chips being made faster
> than 6Mhz?  ...
> ...  There was talk of 6Mhz and 8Mhz machines.
> Maybe even talk of 12Mhz.
> ...Because they almost all use 6502 chips.
> If chess computers can use them why can't we?
Hard to believe.  The fastest 6502 I know of is the 6502C (not 65C02), which
runs up to 4 MHz, but the support chips are hard to get, if anyone makes them.
>          Craig (6502 maniac) Roll
> (has anyone noticed that the mini-assembler is at f666?
> is the 6502 the beast?)
Its in the manual......

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"It... It's your hand Buckaroo" -- Akita

Chris Schumann					schumann@puff.wisc.edu