Chuck writes:
> Ok, so a couple of people have pointed out that the Plextor's support 512
> byte sectors. Further the Plextor CD writer also supports 512 byte sectors.
> So my question is can I use it to write a bootable disk image? Has anyone
> tried this? Tim?
The actual sectors on the CD-ROM are *always* really 2048-byte sectors.
Setting a CD-ROM reader to 512 bytes/sector just splits each real sector
into four. And many SCSI CD-ROM drives will gladly do this via a SCSI
mode select command (though not all VAXen issue the command, nor do all
drives pay attention to it!) and with some you can do it with physica
jumpers instead (or also.)
(Actually, I'm reluctant to call the information on the CD as "physical
sectors" since really the data and error correction information are interleaved
and spread out over the spiral, so that a scratch in one place won't
ruin all chances of recovering the data via ECC. The point is, a CD-ROM
is a bunch of blocks, just as a hard drive is.)
At write-time, all CD-writing software that I know of does things in terms
of 2048-byte sectors. Even the CD-writing software that runs under VMS
(for example, "cdwrite" and "cdrecord".)
If you're really bored you can learn how to do mode page editing on SCSI
drives yourself. I learned it a couple of years back when I got a boatload
of Micropolis 1.6Gig drives that had been set for 520-byte sectors and
wanted to use them in a more "normal" 512-byte mode. Since then the
skill has come in handy to connect modern, fast, and "large" (i.e. 9
Gbytes or larger) SCSI drives onto systems that don't deal with drives
that large. Just go in, edit the disk capacity mode page, and you've
got a smaller than 1 Gig drive that never has to seek very far :-).
--
Tim Shoppa Email: shoppa(a)trailing-edge.com
Trailing Edge Technology WWW: http://www.trailing-edge.com/
7328 Bradley Blvd Voice: 301-767-5917
Bethesda, MD, USA 20817 Fax: 301-767-5927
On May 4, allisonp(a)world.std.com wrote:
> It's an email worm that takes advantage of MS Active-x controls.
>
> This is a wide spreading fast mover and packs a payload.
>
> Locally several companies have reported it and it was only launched
> less than a day ago.
Sure enough, got this on my mail server this morning:
May 4 11:46:16 srv1 sendmail[4958]: LAB04956: usgate.e-mail.com.: SMTP DATA-2 protocol error: 570 Rejected.Potential ILOVEYOU virus.
Why do people use crappy software like that? If I hear one more
idiot say "but I NEEEEEEEEEEEED it!" in reference to micro$lop I'm
going to go postal.
-Dave McGuire
It's certainly spreading fast, I've already received three corrupt messages.
Two of them came from other list servers (not this one) that I belong to and
one came from a friend.
Fortunately, I don't think this one is too distructive...
Steve Robertson <steverob(a)hotoffice.com>
> It's an email worm that takes advantage of MS Active-x controls.
>
> This is a wide spreading fast mover and packs a payload.
>
> Locally several companies have reported it and it was only launched
> less than a day ago.
>
> WWW.f-secure.com has details.
>
> Allison
>
I have some IBM PC's to be disposed of, and I was planning to try and grab
a few of the full height floppy drives before they go to the campus
recycling center. Does anyone have a need for something from a PC, and
I do mean PC, the model before XT's.. Or does someone want to trade
something for a full height floppy drive. If so, let me know and I'll
see what I can do. Small things that might look interesting in a display
case would certainly interest me...
There are monitors as well, but if any work they probably have a lot of
screen burn, and arent worth saving. There is also one AT, but I doubt
anyone would offer enough to make me attempt to acquire it and ship it.
This stuff is at the University of Minnesota, Minneapolis.
-Lawrence LeMay
Ok, so a couple of people have pointed out that the Plextor's support 512
byte sectors. Further the Plextor CD writer also supports 512 byte sectors.
So my question is can I use it to write a bootable disk image? Has anyone
tried this? Tim?
--Chuck
>
>My rule is to pull anything that looks different or interesting. Obviously
>a 16-256k logic board is worth preserving, but so are any special looking
>cables.
>
There was no 16-265k logic board. There was a 16-64k and a 64-256k
What is the world coming to when collectors are having trouble locating
original PC cases and value 64-256k boards ?? Am I getting that old?
Hi, (comments embedded below)
From: allisonp(a)world.std.com <allisonp(a)world.std.com>
>
>Havent played anything hard on it to test if it is a valid 1802 but I have
>comments and suggestions.
>
> Build it as a basic engine, if it needs ram then set a external parameter
> list for how much and what addresses, same for rom.
Yep, in there from the beginning.... maybe for multiple instances of cosmacs
'linked' to each other or at least as a few depositable c++ classes that can
be that generic engine.. But I didn't consider the "Load List" idea for
[all] individually specified ram and rom blocks to define a 'complete
system'. *snag* ;) Thanks. This LL should probably also specify any
additional 'hardware' thrown in (uart, parallel interface( probabbly
necessary to simulate a cosmac disk drives and raising CDOS in the emulator
(final goal)), etc)
> Simulate IO, if it has a uart on the N-lines then create the
> registers/data you interact with (or the Q and Sense lines).
I'm reviewing the CDP1854 uart specs and a UT21 rom listing now and will add
it shortly. I need UT4! ( and UT3, etc... )
>The console can be like the ELF (switches and lights) and/or
>a RS232 tube connected via Q and F lines, software uart required
>as part of the code as UT4 does.
>
> Load UT4 (or whatever) from a start up list to emulate the rom
> and have the 1802 engine execute the "rom" cone out of memory space.
> This would allow code to "call" various ut4 routines like get or type.
>
> The miniassembler is nice and plenty handy. You may want to consider
> having it run like real code loaded into ram later on.
Thanks. And I see your point
> The core of the instruction set is fairly regular so the select tree
> can be broken into functional sub trees for simpler code.
>
> The version of TB I have is quest TB and I don't have it on machine
> readable form (other than papertape which I currentlly can't read)
> so I'd have to copy the pages and someone can have the fun of toggleing
> it in, it'a about 1k or 2k.
Somebody else has been there done that. Thanks Kirk!
Thanks for the suggestions, Allison! More soon.
:)
- Mike: dogas(a)leading.net
>Allison
>
>On Wed, 3 May 2000, Mike wrote:
>
>> Tonight I added the mini-assembler and memory block saves&loads to the
1802
>> simulator. The 95/98/nt console binary and source-code are at:
>>
>> http://users.leading.net/~dogas/classiccmp/cosmac/vcosmac.htm
>>
>> >Allison
>> >
>> >Good runs under W95/nt then, have that running.
>> >M!... Ah UT4. have manual.
>>
>> heh.. early influences...
>>
>> >Wheres Bin/CPP for it?
>>
>> Up there.
>>
>> Let me know if it doesn't do what you think it should.
>>
>> Thanks
>> - Mike: dogas(a)leading.net
>>
>>
>> >
>> >Last emulator for 1802 I'd played with was z80 based, even on a 4mhz z80
>> >it was faster than 1802. I wonder where I put that.
>> >
>> >
>>
>
I just noticed that there is a card punch machine available here in
Minneapolis if someone wants to come and get it. I didnt pay attention
to the exact model, but its one of the 'old' ones, ie, its definitely
not the one with the LED display in the keyboard.
Anyways, if you want it you would probably have to pick it up next week before
it goes to the recycling center. And you would have to let them know
you want it, and arrange for a time to pick it up.
-Lawrence LeMay
lemay(a)cs.umn.edu
