I am looking for a copy of the manual of jumber/switch
settings and pinout's of the ast cc 232 async/sync
serial card.
looking at the jumper page (after the link was posted)
i found nothing.
jpg scans to my email would be great - just attach
them.
n8uhn at yahoo dot com (replace the "'dot" with "."
and "at"' with "@"
Thanks,
Bill
On Feb 8, 16:12, Jim Keohane wrote:
> I'll type more slowly:
>
> Question #1:
>
> If an instruction that takes two cpu cycles (as Sellam Ismail
cited as a
> minimum) and there are 2 cpu cycles per clock cycle then how many
clock
> cycles did this one instruction take?
>
> Answer: one.
NO. There NOT two CPU cycles per clock cycle. Sellam cited two CLOCK
cycles minimum per instruction. He is correct. I've been been
building 6502-based devices and programming 6502 code on and off since
1981, and I suspect Sellam has been arund 6502s nearly as long; we're
both accustomed to calculating how many cycles routines take. The 6502
uses several clock cycles per CPU cycle -- if by cycle you mean a
fetch-execute cycle. That's exactly the opposite of what you're
claiming.
> OK. OK. I'm being cute. But the 6502, sans Woz's Apple ][
> sneakiness for video, can do two memory fetches per clock cycle.
No, it can't. Go read the data sheet. The *system* can, providing
your memory is fast enough that you can run it twice as fast as the CPU
-- which the Apple and some other machines did -- and providing you
have *something else* (eg, the video) doing its memory access only
during the clock phase that the 6502 doesn't use for memory access. It
is the clock edges that trigger the 6502 to perform the memory access.
> Question #2:
>
> If someone writes "pipelining" and encloses it within quotes does
that
> indicate to you that the term is being used, well, advisably?
>
> Answer: Visit groups.google.com and search for "pipelining" and
6502 (or
> related processor).
[...]
> =====excerpt 3=======================
>
> The 6502 _IS_ pipelined, but in ways that are not very dramatic or
even
> obvious
> unless you look at the CPU's internal operation in detail. Rockwell
touted
> the
> pipelining in their 6502 user's guide years ago, it is essentially
this:
>
> When you do a ADC of something, the last cycle of the instruction is
when
> the
> actual data byte is read in, right? Immediately after that the next
opcode
> is
> read so the next instruction has started, right? So when did the 6502
add?
>
> It added while the next opcode was being read. The accumulator does
not
> actually hold the new value until sometime during the second half
(forget
> exactly where) of the opcode cycle of the next instruction.
>
> That's pipelining. It saves you a cycle on every instruction that
does an
> ALU
> operation. It may not be as spectacular as what's being done on the
monster
> RISCs these days but it is essentially pipelining.
Yes, but only on a small number of the instructions. I'm sure other
microprocessors of the day did that, Rockwell marketing not
withstanding.
> I'd say you got me on the "one cycle per instruction" but you
jumped the
> gun on the pipelining issue. OK?
Well, maybe, but the 6502 is not basically a pipelined processor, in
the sense that only a few instructions do anything close to pipelining,
and not even all the intructions that use the ALU do so.
--
Pete Peter Turnbull
Network Manager
University of York
Can anyone tell me exactly what a PACEMIPS PIMM - 33SG144C is? It's made by Performance Semiconductor but it's not listed on their (POOR!) website. I THINK it might be an R33000 embedded processor but I'm not sure.
Joe
Lawrence,
I found an old message from you in the CC archives while I was searching for info on the Micom 2000. In the message you said that you have a Micom 2000. Can you tell me what kind of disks it uses? I know that they're hard sectored 8" SSDD floppies but I don't know how many sectors they use. I picked up a case of sealed boxs of 8" floppy disks today at a hamfest and the case and boxs say that they're for the Micom 2000.
Joe
I recently acquired a California Computer Systems model 2422 Floppy Disk
Controller Rev B. (S-100) in what appears to be good condition but
missing a 2716 EPROM presumably containing the onboard BIOS.
Does anyone have this card and the capability of providing me with a
copy of the PROM or at least a dump of it? I'd also love to get my
hands on the docs, if available.
Thank you,
Erik
**Resent from the proper account**
As I understand it, the drives won't spin up without the panel. I
currently have full
technical documentation for pretty much every DEC hard drive EXCEPT the
RA70.
One of my bosses was a field service engineer for DEC for 15 years, and
the other worked
for 22 years as the senior district representative for New Mexico, West
Texas, Colorado,
Utah, Arizona, and Nevada and was a storage subsystems specialist. They
both agree that
you need the control panel. They also both agree that I'm nuts for
caring.
-----Original Message-----
From: Ethan Dicks
Sent: Sat 2/8/2003 7:21 AM
To: cctalk(a)classiccmp.org
Cc:
Subject: Re: WANTED: RA7x Enclosure/Operator Ctrl. Panel
--- John Willis <jwillis(a)arielusa.com> wrote:
> Wanted: RA7x Enclosure/Operator Ctrl. Panel
Are these things common/rare? Absolutely required or are they
just
very nice to have? I have a couple of RA70 drives I got in a
box
with some KDA50s. Was going to put them in my BA123 with a
KA630
processor. Haven't had the chance - still using a pair of
RD54s.
So... has anyone tried to put RA7X drives in a CPU (not disk)
enclosure? If I'm hosed, then I guess I'm in the market for
a drive enclosure, too (unless there's some way to hack up an
old AT-style tower case...)
-ethan
[demime 1.01a removed an attachment of type application/ms-tnef which had a name of winmail.dat]
I have been blessed with *two* Teletype ASR-33's. Apart from a minor
cleaning, they are going to be just fine. EXCEPT the rubber platens are as
hard as Chinese arithmetic! In case you havent experienced this, if the
platen gets hard, the printer doesnt print well-- the typehead kinda bounces
off the paper and doesnt leave a clean dark mark.
I've tried the usual remedies-- acetone cleans them up, but they're still
rock hard.
I need some suggestions! Should I try ArmorAll (known to soften rubber,
given time), "Platen cleaner", "belt dressing", "french dressing", or what?
Note that I don't need to clean or make it "grippier", it needs to be
softened, a lot.
Regards,
George
On Feb 7, 23:21, Tony Duell wrote:
> > On Feb 6, 22:33, Tony Duell wrote:
> >
> > > I don't see how you can do a proper test without a visual
inspection
> > of
> > > the connections... And I've yet to see a moulded connector that
> > provides
> > > a proper strain-relief for the cable.
> >
> > A good PAT tester will check at a sensible current (though
admittedly a
> > lot only check earth continuity at a proper current). As for
strain
>
> I've never met a PAT tester that tests the current-carrying
conductors at
> a significant current, mainly because there's no easy way to do this
> without dismantling the unit under test (if the cable is fixed) --
the
> maximum current you could pass would be the normal operating current
of
> the unit (by simply applying mains to it), which is not enough. Even
then
> you couldn't measure the voltage drop across one of the conductors.
A proper PAT tester to current standards has a socket for each end of
an IEC cable, and each cable is supposed to be individually tested with
both ends plugged in to the tester.
> > releif, well you're not supposed to swing the equipment by the
power
> > cable, Tony!
>
> True, but equally I don't expect the outer covering of the cable to
pull
> out of the moulded connector in normal use exposing the
single-insulated
> wires inside. Which has happened to many moulded cables round here.
I've only seen one do that -- and it was an instant candidate for the
wirecutters at both ends. A proper visual inspection is supposed to be
the first part of the PAT.
> I assume you'd fail a rewirable plug with the cord grip missing/not
used
> on an electrical safety test. I certainly would.
Yes. The first thing I do with any multiblock is take it apart to see
how the ends are wired -- the cheap ones are usually in a condition
where I feel compelled to re-do the job.
--
Pete Peter Turnbull
Network Manager
University of York
My uncle is lettingme re-set up his old tandy 1400 hd. The battery and everythign appears to be working fine. However, MS-Dos is not loading from the harddrive or from disk. Any suggestions on what cold be wrong?
Thank you
debann17
I have two Kaypro II that I have owned from new. Both are upgraded to run
at higher clock speeds and one has a cooling fan fitted. One has the PC8
ROM There is a complete set of the bundled distribution software (Select,
Perfect Writer etc) with manuals, including that really first class ground
breaking program SBasic, and other programs that I wrote in SBasic
including multi variable non linear regression analysis. Also Unidos and
etc which allows the floppy drives to emulate those of other machines.
I used one of these machines to run the first simulation of the CSIRO
Sydney to Melbourne high speed railway.
What price might one expect for such a a machine?.
Alan Emmerson
Brisbane QLD
Australia
