From: Fred Cisin <cisin at xenosoft.com>
>
> > > > 3) What happens if you copy a -2G file to an otherwise almost full disk?
>
> On Tue, 20 Nov 2007, Brian L. Stuart wrote:
> > It gets you another 2 gig of space, of course. This is the
> > ...
>
> But, what is the resistor color code for negative ohms?
> (Octarine?)
A pigment that reflects only infrared?
BLS
> > 3) What happens if you copy a -2G file to an otherwise almost full disk?
>
> Beats me.
It gets you another 2 gig of space, of course. This is the
little secret of drive manufacturers. For the chip guys,
it's the magic smoke. For the drive guys, they have the
fabulous increases in capacity by copying files of negative
size. They just want us to think it's a lot of hard work
devising new ways of packing magnetic domains tighter.
(Just in case the tounge-in-cheek nature fails to get
throught: :-)
BLS
"Appropriate Resources" in St. Louis may potentially be available to start a
public Museum of Computation History.... there are discussions going on with
people who could easily make it happen in any case, but it's far too early
to say anything definite.
One of the things I was asked as part of a what-if scenario - Could I
anticipate that some collectors on this list would be willing to loan items
on an extended term for such an effort? Only top notch museum quality pieces
would be sought. We'd pay 100% of the costs to have it crated, shipped,
insured, etc. and also full return costs. The length of the loan might be
open-ended at your preference.
Surely some of you have really nice items that you don't have room for and
wouldn't mind it being stored elsewhere for a while so that the public can
enjoy it. If anyone has such things, could you let me know off-list? I need
to find out if enough artifacts are available, how much floor space may be
needed, etc.
Thanks!
Jay West
This message has been forwarded from Usenet. To reply to the
original author, use the email address from the forwarded message.
Date: Mon, 19 Nov 2007 18:22:32 -0600
Groups: comp.sys.dec,comp.sys.dec.micro,alt.sys.pdp11,comp.os.vms
From: "Lee K. Gleason" <lee.gleason at comcast.net>
Subject: four VT100 terminals free
Id: <ZvGdnUBzY_35td_anZ2dnUVZ_hWdnZ2d at comcast.com>
========
I'm narrowing the scope of my collection (translation - no room for
everything anymore). I have four VT100s, in pretty good shape, and a few
additional extra keyboards as well. Free to whoever wants to pick 'em up in
Houston Texas, near TC Jester & the North Loop. First come, first served....
--
Lee K. Gleason N5ZMR
Control-G Consultants
lee.gleason at comcast.net
>
>Subject: Re: *updating* 8088's
> From: "Chuck Guzis" <cclist at sydex.com>
> Date: Tue, 20 Nov 2007 00:47:51 -0800
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>On 19 Nov 2007 at 23:03, Allison wrote:
>
>> Actually it's teh other way around the 386 was more efficient than
>> 286 for the same clock speed.
>
>In 16-bit mode, I seem to recall that the 386SX was a travesty of a
>CPU; a 16 MHz SX ran nowhere near as fast as a comparably-clocked
>286. Early 386 boxes were nothing to crow about in 16-bit mode--and
>a 32-bit software base pretty much didn't exist early on--and the
>386SX was limited to 16MB of external memory, just like the 286.
Overall it was faster if the ISA bus was 16bits. problem was at that
time the code had a lot of 8088 and 286isms in it so there was often
no advantage other tha internally the 386 was bit faster. In practice
and I have a SIIG 3000 box (386sx) with 5mb to test on the 386
was faster but going from 12 to 16 mhz is not a large increment.
>Doubtless the 386SX board designs were low-budged also, which
>probably figured into things. Some 286 vendors made a big thing of
>the fact that a 286 could execute 16-bit real mode code substantially
>faster than the 386SX. For example:
Indeed. to save money in that still expensive ram there were a lot
of wait states inserted to accomodate 85ns simms. That tended to
sharply nullify any internal advantage.
>http://www.intersil.com/data/an/an121.pdf
>
>On the other hand, the 386SX could execute 32-bit code. That is, if
>you had any to run in 1989.
; there in lies the point. CPUs as we well know generally run ahead
as Moore predicts with software lagging behind.
However, in 1989 the 386 as a huge leap ahead and sometimes over
the 286 that not every one had. I did that. I went from
8088/4.77mhz XT to INboard386/16 and from there to 486DX/33.
However... I didn't "buy in" to the PC world until after the WWW
as CP/M z80, PDP-11 and VAX wer faster, easier or on hand where
the PC offered limited or no advantage.
Allison
>Cheers,
>Chuck
>
Date: Mon, 19 Nov 2007 14:44:19 -0600
From: "Jason T" <silent700 at gmail.com>
Subject: What CBM Monitor is this?
I though I knew most of the CBM models, but I don't recognize this one:
http://www.shopgoodwill.com/viewItem.asp?ItemID=3167507
I wrote to the seller and he gave me a part# from the back which
returns nothing in Google.
-------------
Looks like my 1702 except for the colour...
Isn't there a number on the front?
m
Date: Mon, 19 Nov 2007 13:58:13 -0800 (PST)
From: Fred Cisin <cisin at xenosoft.com>
Subject: Micropolis (was: "intelligent" disk drives
>Micropolis made excellent floppy drives. It is too bad that their hard
>drives sucked.
I guess I've just got some bad ones then; speed's all over the place on one
(belt's OK) and another one stopped altogether; when they were still working
a couple of months ago, read errors were pretty common, even with cleaned
heads, lubed helix screw, refreshed disks, etc.
>Did anybody ever use their OS? (bundled with some of their 5.25" floppy
>drives)
MDOS? I've got a copy for my Vectors; boots, but I haven't gotten it to do
anything; could be that the diskette doesn't have anything on it of course...
Anybody know anything about this OS? Anything special that I need to
do to get it to accept commands? One that I know about is DIAG, but
that doesn't work either; just "Invalid command"s.
m
>
>Subject: Re: *updating* 8088's
> From: Fred Cisin <cisin at xenosoft.com>
> Date: Mon, 19 Nov 2007 18:31:39 -0800 (PST)
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>On Tue, 20 Nov 2007, Alexis wrote:
>> I'd like to see an 80286 to 80486 upgrade card. It would need to somehow
>> multiplex the 32-bit bus onto the 16-bit bus, perhaps running the
>> multiplexing process at double the CPU clock speed. The SX wasn't 16-bit was
>> it? Or am I thinking of the 386SX. If it's 16-bit it wouldn't need
>> multiplexing.
>
>Depending on how you DEFINE "16 bit", the 80386SX is a 16 bit version of
>the 32 bit 80386[DX]. It therefore is "relatively" easy to retrofit it to
>replace a 80286.
The 386SX was 32bit core with 16bit databus (modified BIU). While
it was cheaper to build systems around and smaller too the performance
cost was high compared to the DX.
>The 80486SX and 80486DX are the same bit sizes. Their differences involve
>whether or not the math FPU is included.
>
>I ran an 80386 board in a 5150 (8088) machine. There didn't seem to be
>much point to it.
>
I ran a Leading Edge model D (PC XT clone) with an Intel Inboard-386.
It gave me 2MB ram and a 16mhz CPU (beats 4.77!) and a bottleneck of
the 8bit ISA. However it ran winders3.1 and was a whole lot faster
than the 4.77mhz V20. At the time it was far cheaper than a real 386
and much better than the 8088.
Allison
Anyone interested in the following boards? If so, please email ME and make arrangements for shipping or pickup. Bill/KA3AIS
Hard Card - hard disk mounted on 8 bit ISA card with controller. BSM Karddisk 20 (presumably 20 Mb.).
AST RAMpage AT=Pak. "Turns your 2MB expanded memory board into a full featured multifunction product". Looks like daughter-card with manual in generic AST box.
INTEL Aboveboard/PC boxed. 256kb. >> 2Mb.
CGA card with composite connector RCA phono jack. 8 bit ISA. Columbia Data products.
Everex Color/Monochrome card. Dual 9 pin connectors + composite RCA phono connector - switch selected. 8 bit ISA.
Compaq PLUS Luggable computer...Built-in 9 inch monitor, 5.25 inch floppy, HDD. Very Dirty.
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