From: Richard A. Cini, Jr. <rcini(a)optonline.net>
org 0
start:
4 ei
10 lxi b,0 ; inner loop = 65536 times
7 mvi d,50 ; outer loop = 50 times
;;; one time setup 21 cycles (10.5 uS)
loop:
11 push b ; this is just to increase the instruction count
11 push d
11 push h
11 push psw
10 pop psw
10 pop h
10 pop d
10 pop b
5 dcx b
5 mov a,b
4 ora c ; done with inner loop?
10 jnz loop ; if not, keep going
Main loop 108 cycles, 8080A JNZ is 10 tcy pass or fail condition.
65536*108=7077888cy (3.538944 sec)...
assuming one wait state per memory access the 108 becomes
138cy, 65536*138=9043968cy (4.521 sec)
this adds 15cy or 7.5us to the loop 50 times.
5 dcr d ; do this 50 times
10 jnz loop
The two loops total 176947575uS (176.947 sec) or 353895150 clock
cycles assuming NO wait states. one wait state per memory access
will add considerably to the loop times (>226sec!).
housekeeping 3.5us
7 hlt ; done with speed test
end start
I would appreciate it if someone with an Altair could put this in and
time,
in seconds, how long it takes to perform this test.
About an hour.... first 55 minutes to toggle it in and watch it crash
repeatedly. Then there were the crashes due to bus noise...
Seriously if you have the 8080 book you can calculate it as the basic
altair
was 2.00 mhz (500ns Tcy) with no wait state ram. if you had 88S4k the
wait
states for refresh were asynchronous and hard to predict. If the ram
was 88s4k the refresh was invisible as it was synchronous.
If you got it right.... roughly 177 seconds for no mait memory and
somewhere
around 227seconds for memory requiring one wait state per access.
8085 and z80s execute this faster for the same clock due to different
numbers for instructing timing such as jumps which have shorter timing
if the condition fails.
Allison
From: Jeffrey S. Sharp <jss(a)subatomix.com>
>Do you suggest I dip the core stack in distilled water instead of
>isopropyl alcohol?
Isopropanol is ok for the core stack but only if seriously required.
Use only the pure {99.5%} as rubbing alcohol can be up to 70%
water!
>How about if I blew the air from a distance? There's got to be a happy
>medium between a point-blank discharge and spraying from across the
room.
Do so with the greatest care.
Allison
Yes, still using the MEX program for my UNIX dialup on my 1GH computer
and since the upgrade, haven't been able to upload or download, the error
message being "serial input errors".
Is Ron Fowler who wrote the program still around or Al Jewer who worked on
it? Alternatively, anybody here know what I'm talking about and who might
have a suggestion for a fix?
Any assisstance greatly appreciated.
I recently aquired an HP-9000/735-120, minus the RAM
and (I've just realized) the CPU! Grrrrrr.
Anyone know of a reasonably-priced source for these
items?
Thanx--
Jeff
________________________________________________________________
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Existed as large button and also a teeshirt.
|d|i|g|i|t|a|l| (digital keys logo in BLUE)
the word unix in the no symbol (red circle with slash)
and the words....
unix the unsystem, never had it never will.
ca.1984
Allison
: p1
OOLCAY IT-TAY
(or however it appears at the end of the book...
I can't find my copy right now)
----------------------------------------------------
Swapped Out
----------------------------------------------------
Core Dumped
----------------------------------------------------
Carrier Lost
----------------------------------------------------
Lost Cluster
----------------------------------------------------
Hard Wired
----------------------------------------------------
Liquid Cooled
----------------------------------------------------
Simulation Only!
----------------------------------------------------
Overflow again?
Somebody get the
bit bucket.
----------------------------------------------------
Abort, Retry, Fail?
----------------------------------------------------
I'm with the head crash
==============>
You forgot...
WYSIWYG ... What You See Is What You Get (first generation pagelayup
editors)
WYGINS.... What You Get Is No Surprize (Runoff, TEX, LAtex users know
this)
-----Original Message-----
From: Fred Cisin (XenoSoft) <cisin(a)xenosoft.com>
To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org>
Date: Saturday, September 01, 2001 1:38 PM
Subject: RE: Geek Button Sayings
>DON'T ANTHROPOMORPHIZE COMPUTERS - THEY HATE IT WHEN YOU DO THAT
>
>MAKE BILL GATES A MILLIONAIRE (too subtle for most people)
>
>W.I.B.A.S - WINDOWS IS BUGGY AND SLOW (from about 1990)
>
>
>
>
"I [heart] my Wang"
Might also appeal to readers of Penny Arcade..
Jim
On Saturday, September 01, 2001 1:30 AM, Larry Anderson
[SMTP:foxnhare@jps.net] wrote:
>
> If you had the opportunity to write a classic computer related phrase
> (or whatever will work) on a 2.25" diameter button, what would you
> like
> to wear?
>
> Of course some of the classics are:
>
> ////////////
>
> BYTE ME!
>
> ////////////
>
> DANCE
> ALGORITHM 1.0
>
> 0A ASL ;SHIFT TO
> THE LEFT!
> 4A LSR ;SHIFT TO
> THE RIGHT!
> 48 PHA ;PUSH A!
> 68 PLA ;PULL A!
> EA NOP ;BYTE!
> EA NOP ;BYTE!
> EA NOP ;BYTE!
>
> ////////////
>
> 0 1 0 0 0 1 1 0
> 0 1 0 1 0 1 0 1
> 0 1 0 0 0 0 1 1
> 0 1 0 0 1 0 1 1
> 0 0 1 0 0 0 0 0
> 0 1 0 1 1 0 0 1
> 0 1 0 0 1 1 1 1
> 0 1 0 1 0 1 0 1
> 0 0 1 0 0 0 0 1
>
> (this one is a bit harsh, I'd prefer to use a different phrase)
>
> //////////////
>
> My other computer is an Apple I
>
> //////////////
>
> My computer
> takes up half a room
> draws 500 watts,
> has 4k of RAM,
> and runs at only 500khz...
>
> Beat That!
>
> ////////////////
>
>
>
> reason: I have a bag of old buttons I am relabling (sticking new
> labels
> over the previous 1996 dated event designs) to give away at VCF 5.0,
> besides the Commodore related ones (of course) and those above, I am
> open to do other designs (I have already did a nice "I'd rather be
> playing Spacewar" in button form). Just let me know, I have about
> 60-100 buttons I'm doing. (color and photos are doable, fonts too if
> I
> have em.)
From: Dave McGuire <mcguire(a)neurotica.com>
> There is the well-known software package for DEC's pdp8/e (and
>perhaps other -8 models) that makes quite reasonable music from a
>nearby AM radio, if memory serves the "interference" was generated by
>the core memory drivers...you took the chassis cover off, put an AM
>radio near the machine, ran the program, gave it a "song" file, and
>away it played.
>
> -Dave
There was also a pack of routines that used the link bit driving an
amplifier to a speaker... much cleaner. Then there is also software
for the A/D board... fairly decent.
Other classic music hardware was the ALS-8.
As to sounds, the best is my S-S100 boot test, series or disk seeks
beeps to a speaker (coded) and the vt100 terminal beep after it finally
says hello to the serial line. It's the best for the one reason, they
indicate
boot progress and success. ;)
Allison
As a followup...
Today I got the mux board put together and hooked up a few terminals. I hit
return and was greeted with the infamous "PLEASE LOG IN". Then I created an
A000 account, logged in, and entered/ran some basic programs... WOOHOO! It's
all up 100% now.
Funny how I just got the system completely usable today, and already I'm
thinking about hardware upgrades *smile*
It will take me some time - weeks at least & maybe months to get around to
putting a FreeBSD machine on front of the system so people can telnet to the
HP2000 box across the internet. However, if someone just can't wait to play
with it (yes, a few people have already asked me about this) - send me a
private email and I'll slap a modem directly on the system so you can dial
in. All you'd have is long distance fees.
Regards! (time for me to go have lots of beer to celebrate)
Jay West
