>Eh? While the command set of the UDA50 is MSCP, I wasn't aware that MSCP
>command packets were sent to RA drives. I don't see why it would be
>impossible to make an SDI controller that used some other command set.
Sorry, I was talking at a different abstract level.. just like the RQZX1
talks MSCP on the host side, and SCSI on the disk side, the UDA50 talks
MSCP on the host side... I've never worried about what it actually talks
on the disk side...
>IMHO the RL11 is dumber than the RK11. For one thing the RK11 supports
>spiral reads/writes. And to move heads you load the disk address register
>with the cylinder you want to go to, not the number of cylinders you want
>to move. With the RL11 you've got to remember where you are.
Not just that, but the driver is responsible for trying offsets from
the center track in case a read fails... Back when we first added support
for the RL01/02 to RT-11, it was explained to us that with the RL11, some
of the smarts are moved out to each disk unit. This way the controller
doesn't have to have all the smarts... supposedly more cost-effective (?!)
Anyway, if you lose track of where you are, you have to reset to track
zero and re-seek. There are several offsets (positive and negative)
that the driver is supposed to try when it fails to read (and maybe
write) a block. As already mentioned, the driver has to take care
of track to track changes... which means that the driver has to take
a user request and process it as multiple single-track operations
until complete...
Where the RK driver was simple, the RL driver was a PITA... and the
convolutions in the MSCP handler are even more impressive...
Megan Gentry
Former RT-11 Developer
+--------------------------------+-------------------------------------+
| Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry(a)zk3.dec.com |
| Unix Support Engineering Group | (home): mbg(a)world.std.com |
| Digital Equipment Corporation | |
| 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ |
| Nashua, NH 03062 | "pdp-11 programmer - some assembler |
| (603) 884 1055 | required." - mbg |
+--------------------------------+-------------------------------------+
I recently rescued an Intelligent Systems Corp. model 8051 Intecolor
terminal/pc, s/n 5013 from the side of a road (there were several
printers which first caught my eye, this unit has a wood grained
plastic cover which first made me think it was an old window air
conditioner as it was face down and covered with other junk). I saw
this advertised in the February and December issues of Byte Magazine
as a model 8001. The December 76 Byte ad states this is an intelligent
terminal that can be upgraded to a personal computer by adding Basic
and extra ram (this appears to have been upgraded).
I had never seen one of these in person before and didn't realize how
massive they are: 17" high by 19 1/2 " wide by 22" deep, weighing at
least 50 pounds (although I haven't weighed it). The tube is a 19"
color. There are 9 slots inside with a CPU/I/O/Keyboard board (Intel
8080A), memory, additional memory board, prom board (with Basic and
others) plus a floppy controller. Ports (DB25) are J1 Modem, J2 Floppy
Tape, J3 Keyboard, J4 24 Bit I/O (this port is blank actually),J5
Floppy Disk, J6 USART (port is blank).
Unfortunately there was no keyboard or documentation and outside of
the Byte ads I don't know anything about this. Does anyone know where
I can get a keyboard and documentation for this? Also the power cable
is non-standard, per a friend of mine it was used by typewriter
manufacturers and is known as a AC Victor cable.
Thanks,
Marty
< Personally, if it came to building a board from scratch, I'd have to say I
< compatible Dual IDE controller. Drives are cheaper. I can just see stickin
< my BA123 - 20 g of space, for less than a grand. Gee, I wonder if the powe
< (snicker). There are MSCP docs somewhere out their on the web - or you cou
< people, I believe at least one of them has the MSCP handbook. I'd buy it i
< Q-bus version, anyway)
A IDE controller for Qbus is fairly straightforward if your willing to have
a little local intelligence for cache and dma management. If your willing
to write a non-MSCP VMS driver or unix driver for it. Adding MSCP may make
it more difficult as there is far more taskwork.
Doing it as scsi is not much worse... it's the scsi controllers and the
associated software that are a pain.
Allison
Please contact poster directly
Phil Baumeister <baum-nospam(a)sonic.net> wrote in message
<6nuqu8$qi8$2(a)ultra.sonic.net>...
> please remove -nospam when replying
>
> i would like to find a home for a
> 2314 magnetic disk file drive
> that was once (1968) mounted
> on IBM 360 main frames.
>
> items that are 20 years old are
> junk and are trashed. but this
> is 30 years old. where should
> it end up?
>
> any suggestions?
>
> phil baumeister
>
>
> Ahh, there goes my bid!
This lot includes some real nice parts and collectiv
parts .... and the bid already reached 76 USD.
Shoud we start a bidding war ? :((
Gruss
H.
--
Ich denke, also bin ich, also gut
HRK
< all over the US. I went to one and I drooled all over a VAX with a
< couple of winchester cabinets, 9 track tape drives, and a big terminal
They can be big. Myself I run a slew of baby vaxen (2000s, 3100s and
Q-bus Microvaxen).
< server. My boss told me I should bid $1.00 on it. I joked and said, "If
< I did that I might get it!" heheheh They make you haul the stuff off if
That's their revenge.
Allison
Forwarded from the Greenkeys mailing list. Current bid is $56...
- John
Date: Tue, 07 Jul 1998 22:28:07 -0400
From: "Charles A. Days" <radiodaz(a)ici.net>
Organization: Old Radio Days
To: Major Domo <greenkeys(a)qth.net>
Subject: [GreenKeys] Auctioning Timex/Sinclair ZX-80,81 1000 w/RTTY&CW
interface
Sender: owner-greenkeys(a)qth.net
Hi,
I am auctioning off my entire Timex/Sinclair ZX-80,81 & 1000 collection.
I had used it for program development way back when. As well as Ham
radio RTTY/CW. Go to:
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=20430855
>> Second, has anyone heard of a Commodore C64k?? I found a news post where
>> a guy had two of these available, but I don't recognize the "k" suffix.
> I think the person added it himself.
> There are four flavors of the Commodore 64.
> Commodore 64 - The original unit, roundy brownish-grey case dk. brown
> keyboard, a good machine.
And the brown and the beige case versions ad of course the golden.
> Commodore 64c - The updated (low-profile lt.cream case, white keys) cost
> reduced model unlike other reponses no voices were removed. The story is
> Commodore did a 'bug fix' on the sound chip that affected games that utilized
> a perceived flaw on the sound chip that made digitized sound playback easy, on
> the 64c you can barely hear the digitized segments.
This unit was also called C64-II. And remember the gray case version.
> Commodore SX-64 - the Commodore 64 in a luggable all-in-one unit included 64,
> 5" color display, built-in 1541 disk drive and audio speaker. Pretty cool,
> used original C64 chips though Commodore altered the ROMs to better support
> the built in drive at the sacrifice of cassette support (and compatibility
> with some programs and hardware that required it.)
Don't forget the DX.
> Commodore-128 - One of the facets of the Commodore 128 is the C64 mode, the
> chips reflect the older 64 and is 99.94% perfect in emulation except for one
> memory location which can bump the computer into 2mgz mode thereby messing up
> the display provided by the 1mghz 40 column display chip. :/ Some earlier
> games inadvertanly activate this mode.
And speaking of the 128 (Which I don't considere a C64) there are
at least two versions of the 120D with detatched keyboard.
> If I wanted to do only 64 stuff the original grey 64 is the one to get.
:)
Gruss
H.
P.S.: Nice PET - FAQ
--
Ich denke, also bin ich, also gut
HRK
>>What is the pinout of the 23-pin port?
> Max, your message consisted of one line of question with
> dozens of lines of previous message. Please consider editing
> out the parts you don't need.
True
> Also, there are dozens of web pages with the pinouts of the various
> Amigas. Did you try a web search before you replied? I entered
> "23 pin port amiga" in Hotbot and got 1,970 hits, many valid.
Ever tried this for PET (a classic in any sense) ?
> Is the Amiga a valid topic for the mailing list? Surely the
> first models fit the ten-year-rule, but the A2000 falls short
> by at least a year or two. There are other resources
> you can tap - the Amiga news groups out-post the classic groups
> by at least an order of magnitude, and that's only counting
> the English-speaking groups.
Shure, there are resources for anything, including a lot of
obsolete computer things beside this list, but if you want
to take this 10 year gudeline the hard way, you'll have to
cut out any discusion about CGA for exampe - they are still
in production.
And fr the Amiga 2000 - I have two in my collection and
considere them vintage :)
Gruss
H.
--
Ich denke, also bin ich, also gut
HRK
< old Altair hackers, so.... How hard would it be (for a software guy) to
< replace the ROM with something else, say, a parallel cable from a PC that
< fed data through the ROM socket?
not easy at all. You really need to make or buy an eprom emulator that can
do 6830 (an oddball pinout).
< The clock is already very slow, 500KHz, I think, but I could slow it to
< 1HZ if it would help. Could I software decode the address, do whatever
< handshaking I need to do from the TTL-levels on LPT1, and emulate a ROM
< without buying a ROM emulator?
Not possible, there is a minimum clock spec as the internal registers are
dynamic and would forget.
Allison
