I just want to take a moment to apologize for the
comment that was made a day or two ago. It was not my
intention to deride anyone of any particular
background (and for that reason an apology isn't
really necessary). Though I spend a good deal of time
"deriding" my own heritage (and others!), I sometimes
fail to understand that certain jests might not be
appreciated. As such I here open myself up to any and
all insults that any would deem appropriate, beginning
with jokes about the Irish, Germans, and last but not
least YUGOSLAVIANS! Do your worst knaves! :)
I used to work with a Mexican guy, did the right
thing, came here legally (also made a bundle, and
bought a business for himself back in Mexico). I
routinely would mimic his accent and manner of speech
(what was so funny was how his pronunciation of
Charmagne, the name of a Jamaican women who also
worked with us, sounded like Chow Mein LOL LOL LOL. He
never took any of it the wrong way though.
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Unfortunately - my monitor wont scan down to 15KHz and
a
nice LCD monitor is out of the question (for the
moment
anyway).
The one place I've seen scan doublers used in a major
way seems to have been in the Amiga scene. I dont mind
having to make up cables/adapters if anyone has
anything.
Cheers
Ian.
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>
>Subject: Re: Underclocking m68k CPUs
> From: "Ethan Dicks" <ethan.dicks at gmail.com>
> Date: Wed, 11 Apr 2007 13:00:29 -0400
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>On 4/11/07, Jules Richardson <julesrichardsonuk at yahoo.co.uk> wrote:
>>
>> As subject... do 68k CPUs cope with being underclocked? I've got a surplus
>> 8-MHz part from an Amiga, and at the museum we've got a 68000 microprocessor
>> trainer which is short its CPU. I'm not sure what speed CPU the trainer
>> expects though (because I haven't looked in any detail :-) but it'll certainly
>> be 8Mhz or less.
>
>Section 10.7 of the Users Manual
>(http://iteso.mx/~temoc/micros/MC68000UM.pdf) indicates that 4MHz is
>the minimum clock speed for an 8MHz-rated part. I've seen 4MHz-badged
>parts, but it was in a 4MHz trainer from about 1982. I don't know
>where you'd find performance data on a part that old.
Motorola databook would have it and they weren't rare either.
I've run them down to 100khz, the timing of the signals moves a bit as
at those slow speeds the propagation delay is not significant anymore
relative to the cpu timing. I did that once with a 68k with apparent
normal (and very slow) behavour.
With rare expection most CPU underclock to the extreme and most will
overclock by some. The exceptions are any of the 8080/8085/z80 and
similar cpus that use dynamic memory cells and are NOT static. Though
I've taken them to very low clock speeds as well though not to full
stop. I'ts rare to see a data sheet specify a minimum clock that
isn't very slow or at least the vendors testing minima.
Allison
As subject... do 68k CPUs cope with being underclocked? I've got a surplus
8-MHz part from an Amiga, and at the museum we've got a 68000 microprocessor
trainer which is short its CPU. I'm not sure what speed CPU the trainer
expects though (because I haven't looked in any detail :-) but it'll certainly
be 8Mhz or less.
cheers
Jules
Ok, is there a known severe RFI problem with mounting a RX02 directly on top
of a RL02 in an H960???
I went back to look at the "RL02 faults when RX02 is on" problem. I had left
the rear top cover of the RL02 up in the service position (with the drive
extended from the rack). I retested without touching anything. Sure enough,
the problem was "gone". The RL02 wouldn't fault no matter what. So I put
that rear top cover back down and screwed in the 4 screws, then pushed the
RL02 back into the rack and voila - the problem reoccured. The RL02 will
fault just after spinup IF the RX02 (which is mounted directly above it) is
powered on. Aha... I was now thinking a cable problem! I figured pushing the
RL02 in and out of the rack seemed to be the causative factor, bending a
cable just right or something.
So I pulled the RL02 fully out front on the rails, and the problem went away
(with the RX02 turned on just above it, but back in the rack). So with this
configuration I figured that the problem occured when I pushed the RL02 back
into the rack as it must jiggle some cables. I decided to try THIS...
I extend the RL02 out the front and power up everything, including the RX02.
The RL02 spins up just fine, no fault. Once it is ready... I start pushing
the RL02 back in the rack, very slowly. After going back about 7 or 8
inches, the ready light starts to flash. I pull the drive outwards 1/2 inch
and the ready light stops flashing. Push the RL02 in 1/2 inch and it starts
flashing again. If I push the RL02 in another 2 or 3 inches after the ready
light starts flashing, the drive faults. This is not a freak occurance, it
is completely reproduceable. This makes me think bad cables.
However, if I go and look in back at the cables when the drive is right at
the point the ready light starts to flash, there are no cables being moved
even slightly. I can move the RL02 cables and RX02 cables by hand, the drive
doesn't fault. What is even MORE wierd... if I move the RL02 drive inward
until the ready light starts to flash, then unplug power to the RX02 (the
power cable for the RX02 is around the front, so I can unplug it without
disturbing any cables at all)... the RL02 ready light stops flashing. This
would make me think it is NOT cables, and it seems to be proxmity of the top
of the RL02 drive to the bottom of the RX02 drive.
I know everyone probably thinks I'm nuts, but has anyone heard of a reason
not to mount a RX02 directly over an RL02???
Jay
From: "Ensor" <classiccmp at memory-alpha.org.uk>
> Looking around I see that "NetBSD" in particular supports quite a few
> architectures including VAX, SGI, NeXT etc etc,
NetBSD is, right or wrong, noted as the run-on-anything Unix (for various
values of run). That said, since the people doing a lot of the paid
development are focused on highish-end embedded systems, they are less
interested in slavish devotion to ancient systems. Things like GCC also
have a huge impact.
A few ports have recently died (anything ns32000 (e.g. pc532) due to GCC
dropping support), some are discussed but never gestated (pdp10, pc-rt) and
some are more moribund than others (vax, though there has been significant
effort recently).
The 2.x and 3.x releases have bloated to obscene proportions, like needing
more than 8M of memory (;^}).
> So, can anyone point me at a website listing Linux ports to architectures
> other than PC's. And what modern *nix ports, if any, do other list members
> use on their classic iron?
You can browse the source code under "arch" and see what ports are
committed. For example: http://lxr.linux.no/source/arch/. This doesn't
tell the whole story, as there are at least a handful of wildcat ports that
never made mainline.
>PS: If anyone knows of any sources for the ADP50 or similarly functional
>8-bit ISA IDE adapters, that would be much appreciated as well. Thanks!
Sorry to be late in on the discussion but....
I recommend an Adaptec ST-02 or ST-01 as I'm souping up a IBM PC portable 5155 to
use a built-in CF card as a hard disk (look ma, no visible hard drives!)
I tried an Trantor T-130 but it would read and not write to the drive (I tried it with a regular
SCSI 40mb drive first). From doing a search on the problem, one might have to do an
initialize by going into DOS debug and entering G=C800:0005 to start the utility program
on the BIOS.
But since I'm too lazy to try that, I got an ST-02 and put it in the 5155. No probs using
any drive (the 40MB was an old Quantum out of a Mac). with Dos 3.30A to get extra partitions.
The real fun was taking an ACARD 7720IU SCSI to IDE converter (AKA an ARS-2000IU),
updating the BIOS to the latest version (3.86) and popping on a cheapo eBay male IDE-CF
converter with a 64MB Sandisk CF card. The ST-02 and an ST-01 had no problems
seeing the CF card.
I had to fdisk the card on my Win 98 machine (Dos 3.30A fdisk saw extra non-dos partitions
which it couldn't get rid of), but then the Dos 3.30A had no problems formatting C & D. I'm
getting in a 128MB Sandisk to get some more 32MB paritions, but I think the Adaptecs are the
best as far as my experience goes. The ST-01 doesn't have a floppy controller so it is a bit
shorter and fits into the 5155 better. From what I can see from the labels the BIOS is the same
as the ST-02 but I haven't looked that closely.
This was a message from Gary Fisher
Hi,
Does anyone have a spare scan doubler - the little bit
of magic that converts old style EGA to VGA signals?
I'm trying to cut down on the number of monitors I've
currently got in the 'workshop' and this would
definitely
help.
Anything considered.
Regards
Ian.
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