I wanted to get this out ASAP for those travelling in from out of the
area...
VCF LODGING OPTIONS!!
http://www.vintage.org/2007/main/lodging.php
The Residence Inn ($119) is minor luxury, the Holiday Inn ($99) is
recently renovated (I am told). For those on a budget, use the internet
to find a budget hotel or motel in the area.
Rates are definitely higher than they've ever been for VCF, mostly due to
normal inflation trends (it ain't cheap out here). If you can find
something clean and nearby for under $80 then let me know and I'll add it
to the lodging page.
More on VCFX in the newsletter coming out by this weekend.
--
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
[ Old computing resources for business || Buy/Sell/Trade Vintage Computers ]
[ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]
-----------Original Message:
Date: Thu, 11 Oct 2007 08:39:00 -0700
From: "Chuck Guzis" <cclist at sydex.com>
Subject: Re: Extracting CDOS and CP/M) files
Looking at the first diskette image, it ppears that it's been
corrupted somehow (the second one is fine). Take a look at cylinder
1, side 0, sector 1. Near the beginning of the directory we see the
entries for two files, FRAME1.MAP, FRAME1.PIX (2 extents)
<snip>
-----------Reply:
That's what I see: the first and third image have cross-linked files
but the second one looks OK; the question is whether the disks
themselves have a problem or whether Dave's IMD program got
confused. The first image seems to start on sector 2 and wrap
around; however, the third does start on sector1 but has errors
nevertheless.
mike
------------Original Message:
Date: Thu, 11 Oct 2007 11:40:11 -0700
From: "Chuck Guzis" <cclist at sydex.com>
Subject: Re: Extracting CDOS and CP/M) files
On 11 Oct 2007 at 13:51, M H Stein wrote:
> That's what I see: the first and third image have cross-linked files
> but the second one looks OK; the question is whether the disks
> themselves have a problem or whether Dave's IMD program got
> confused. The first image seems to start on sector 2 and wrap
> around; however, the third does start on sector1 but has errors
> nevertheless.
(Disclaimer: I haven't looked at the third image yet)
But it's not TeleDisk or ImageDisk that's messed up. Note that in
the first disk, the cross-linking/double-allocation entries are
contained in the same physical sector.
I'll grab a gander at the third disk later today when I have a
chance.
Cheers,
Chuck
----------------Reply:
Yes, as usual I pressed Send before completely reading your message;
obviously the problem is on the disks themselves. I'm kicking myself
because I had looked at the directory entries before I started but didn't
notice the duplicate pointers (see, your eyes aren't nearly as bad as mine).
And it didn't occur to me that neither CDOS nor Cromix would complain
until I finally ran STAT; I just assumed the the disks must be good and the
problem lay in the transfer. Live & learn - never assume anything.
mike
---------------Original Message:
Date: Thu, 11 Oct 2007 10:58:08 -0700 (PDT)
From: Fred Cisin <cisin at xenosoft.com>
Subject: Re: Extracting CDOS and CP/M) files
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Message-ID: <20071011105050.V71651 at shell.lmi.net>
Content-Type: TEXT/PLAIN; charset=US-ASCII
> > CDOS had one or more bytes in the first physical sector of the disk to
> > identify which format. There ARE multiple (user modifications?) variant
> > formats that may have the same ID byte(s)!
On Thu, 11 Oct 2007, Dave Dunfield wrote:
> Anyone have more info on this? - One of my main problems is determining
> exactly what format these disks are in.
It might be stored in the first sector, or it might be known only to the
OS.
On a functioning CP/M 2.x? machine, STAT DSK: gives some of the
parameters.
> Does each entry represent a cluster?
Yes, each of the numbers in the block list represents a "cluster" (which
is the MICROS~1 word for a block) Each OS company seems to have had their
own unique word (like "standards") for an allocation unit.
Remember that CP/M calls a 128 byte record a "sector" disunirregardless of
how many there are in each physical sector.
-----------------Reply:
On a Cromemco disk (including HDs) at offset 0070H there are 6 bytes that
indicate CDOS or Cromix format, Single or Double density and S/D sided,
and these are all options in the format (init) program. This is why track 0 is
formatted as the lowest common denominator (SD) for all floppies, so that
the controller can start with a known format and then decide how to handle
the rest of the disk. Hard disks indicate type (IMI/MFM) instead of SD/DD & SS/DS.
The first (dummy) directory entry of a CDOS floppy contains the 8 character
disk ID, the date it was formatted and the number of directory entries.
The remaining parameters (disk size, interleave vector table, etc. are stored
in the BIOS the same as CP/M AFAIK; hard disks keep size &c on the disk
(along with partition & alternate track tables) so that you can swap disks
without reconfiguring anything.
mike
------------Original Message:
Date: Thu, 11 Oct 2007 10:22:38 -0700 (PDT)
From: Roger Ivie <rivie at ridgenet.net>
Subject: Re: Extracting CDOS and CP/M) files
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Message-ID: <Pine.NEB.4.63.0710111021560.5479 at stench.no.domain>
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
On Thu, 11 Oct 2007, Dave Dunfield wrote:
>
> Does each entry represent a cluster? The CDOS manual does have tables
> relating physical sectors to clusters, which can be represented with an
> 8-bit value. These are listed for "large disks" and "small disks", although
> it's not clear where a DSDD 5.25" disk fits (it's large for a 5.25,
> small compared to 8") - I'm guessing the "small disks" means any 5.25,
> but I'd love to be corrected if anyone knows differently.
In CP/M, each entry represents a cluster and "small disk" means
"has fewer than 256 clusters".
--
roger ivie
rivie at ridgenet.net
------------Reply:
In Cromemco-speak, (S)mall usually means 5 1/4 and (L)arge=8"
m
I've just purchased 2000pcs of Tyco Electronics/AMP 5-555237-1 MMJ plugs
as a last-time buy since these are being discontinued by Tyco. If anyone
needs some plugs or a cord made, now is the time to get in touch with me.
Those plugs should get here in a couple of weeks (possibly sooner), but I
still have 2-3 dozen or so on hand that I can use for making cables in the
meantime. Even with the discount I got when buying that many connectors at
once, it was still a very significant investment of money, so anything I
can sell now to help offset that cost would be a good thing.
I've also gotten my hands on another spool of DEC H8240 DECconnect cord,
so those who wanted some cables made with genuine DEC wire should also get
in touch with me now. I still have a small amount of ivory colored cord on
hand (probably 30-40ft) as well if anyone wants a few cables made from
that. I've mainly been offering the 10ft cables on eBay for $10.00 +
postage, but I can make them any length required for $1.00/ft plus $1.00
for two connectors.
I still have a limited number of other misc DEC MMJ serial adapters in
addition to the stock of new H8571-J adapters that I mentioned previously.
If you need something specific, drop me a note and I'll see if I have it.
I also found that I currently have 10 used (but good condition) H8571-J
adapters that I'll let go for $20.00 each since a few folks expressed an
interest in those.
I never imagined I'd get this involved with making cables as a "hobby",
but I don't turn a profit on these (I've gone in the hole on this stuff in
a huge way over the last couple of months), so I certainly can't call it a
business :)
>
> I can't state so categorically but my understanding is that they were very
> much the same.
> Going back to a conversation of a few weeks ago, when we were
> developing/running Verex/Thoth at UBC ca 1980 it was on a 990/10. The next
> major step in the project was to develop a distributed kernel for multiple
> processors. To this end, 3 bare single board computers based on the 9900
> chip
> were ordered and received from TI. Something makes me think they were
> called
> "990/5"s. I remember making up a front panel for the 3 of them with reset
> buttons and a few status LEDs to go in the rack with the /10. The idea, of
> course, was to use the 9900s because we already had the compilers,etc.
> generating code for the 990/10.
>
Here are some pics of possibly a related system that I posted a while ago.
http://vintagecomputer.net/ti/TI-990-101/
Bill D
If you are in the UK then Black Box stock MMJ cables.
Rod
-----Original Message-----
From: cctech-bounces at classiccmp.org
[mailto:cctech-bounces at classiccmp.org] On Behalf Of Tony Duell
Sent: 02 October 2007 21:12
To: cctalk at classiccmp.org
Subject: Re: Setting up a VAXstation
>
> Making an MMJ cable is a piece of cake. Just take the retention clip
> off of the RJ11 at the end of a phone cord. Crimp an RJ45 on the
> other
Rememeber the OP (and I) are in the UK. The standard telephone connector
over here is not an RJ11 or snythig like that.
> end with the proper wires heading to the proper pins, and use a Cisco
> RJ45->DE9 adapter.
Having had to try to get wires into the right holes on an RJ45
connector,
I would _much_ rather solder up a D connector.
-tony
We live in a 2nd floor apartment, and are getting ready to put our
Neo Geo 4-Slot into storage. I'm wondering if anyone has any advice
on this. We are thinking a refrigerator dolly, along with a U-Haul
truck that will allow it to stand up during transport. Does this
sound about right? How many people does something like this take to
get down the stairs? It took 3 people to get it up the stairs when
we bought it a few years ago.
Zane
--
| Zane H. Healy | UNIX Systems Administrator |
| healyzh at aracnet.com (primary) | OpenVMS Enthusiast |
| MONK::HEALYZH (DECnet) | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| PDP-10 Emulation and Zane's Computer Museum. |
| http://www.aracnet.com/~healyzh/ |
