At 10:09 PM 2/13/98 -0500, you wrote:
>I've never HEARD of a disk exerciser.
>
>What on earth is one for? Pushups? Situps?
When I heard the description, I assumed it was a standalone box you could
connect a floppy to, and test every function on the floppy, maybe use it as
a burn-in test or something like that.
-John Higginbotham-
-limbo.netpath.net-
>
>Are modes 8,9,10 things like 320*200 in 16 colours?
>
>Remember the CGA monitor can display 16 colours (there are 4 TTL-level
>digital input lines). The original CGA card didn't have enough memory (or
>the right logic) to do anything more than 2 colours at 320*200, although
>the monitor would have been capable of it. The PC-jr did have enough
>memory for this.
An old reference I have says:
mode 8 is 160X200 16 colors
mode 9 is 320X200 16 colors
mode 10 is 640X200 4 colors
My PC JX monitor has a 16 pin connector, same shape as a games port.
Hans
In a message dated 98-02-14 21:03:44 EST, you write:
<< For an external drive. The one I have in the garage is IBM# 4869
(360KB). I've seen a 720KB 3.5" version but don't know its' #. >>
the 4869 is the big external ps2 floppy drive, usually with a 360k drive
hiding inside. am i correct any floppy controller with the external connector
can run this drive?
david
>> Another lucky find - a Memotech MTX500 for $2. :) Beautiful computer -
>> aluminium case, nice looking external power supply, and black.
>
>Wouldn't that be MTX512?
No. It seems that the 512 was the 64k version of the 500 - the 500 was
32k and thus slightly cheaper.
Adam.
OK, here we go. LOCAL PICKUP ONLY in Kent, WA (near Seattle). There's no
flaming way I'm shipping this thing unless someone wants to pay the freight
up front. ;-)
What I've got is a Century Data M315-1 SMD disk drive. 14" platters, God
only knows what capacity it is. It seems to power up and spin up OK, is
noisy as blazes, has a HUGE linear voice-coil head positioner, and that's
about all I know (or want to know) about it.
I'll happily hand this beast, along with its rack mounting rails, over to
the first happy vic... uhh, 'volunteer' to speak up and say they'll come
get it.
Any takers? If not, and I can't get any from comp.sys.dec, I'll have no
choice but to tear out the useful parts and scrap the rest.
Drop me a note, please. I hate to scrap anything, but I need the room! I'd
far rather give the beast to someone who can use it.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Sysop, The Dragon's Cave BBS (Fidonet 1:343/272)
(Hamateur: WD6EOS) (E-mail: kyrrin2(a)wizards.net)
http://www.wizards.net/technoid
"Our science can only describe an object, event, or living thing in our own
human terms. It cannot, in any way, define any of them..."
Hi. I wanted to know what printers are avaible for an Apple ][+, with 64K RAM, as well as any other disk drives other than the Disk II.
Also, where can I get one of these (either of the above items)?
Thanks again,
Tim D. Hotze
I have just retreived a BBC computer.
Seems to work fine, and I have managed to get directories of several of the
(rather warped) 5.25 disks. I'm extremely surprised any data is readable at
all - nice looking tandem dual floppy.
However, onscreen I see there's a problem with the machine.
I see perhaps 1/5th of the screen and then it repeats. Furthermore, the
width of the screen isn't correct... that is, I see 20 or so character wide
lines displaying and thus staircaising. I suspect its a hardware problem
(almost 100% certain here, I've tried software mode changes - same in every
mode), but have nil hardware expertise.
So, when (occasionally) i see a > prompt, and type, i see what I type
perhaps 20 times in varying places on the screen, each line offset from the
other.
Can anyone suggest my first steps to playing with it - what sort of chips
should I be looking for, perhaps?
I know, I'm behind the 8-ball, but you're all such brilliant guys at
restoration, right?
Any help much appreciated.
Cheers
Andrew
>From "cad at " at gamewood.net Fri Feb 13 23:22:44 1998
From: "cad at " at gamewood.net (Charles A. Davis)
Date: Sun Feb 27 18:31:59 2005
Subject: BBC Model B - video help
References: <01bd3905$ff8703a0$3ef438cb@nostromo>
Message-ID: <199802140528.AAA03565(a)fox.gamewood.net>
Andrew Davie wrote:
>
> I have just retreived a BBC computer.
> Seems to work fine, and I have managed to get directories of several of the
> (rather warped) 5.25 disks. I'm extremely surprised any data is readable at
> all - nice looking tandem dual floppy.
> However, onscreen I see there's a problem with the machine.
> I see perhaps 1/5th of the screen and then it repeats. Furthermore, the
> width of the screen isn't correct... that is, I see 20 or so character wide
> lines displaying and thus staircaising. I suspect its a hardware problem
> (almost 100% certain here, I've tried software mode changes - same in every
> mode), but have nil hardware expertise.
> So, when (occasionally) i see a > prompt, and type, i see what I type
> perhaps 20 times in varying places on the screen, each line offset from the
> other.
> Can anyone suggest my first steps to playing with it - what sort of chips
> should I be looking for, perhaps?
> I know, I'm behind the 8-ball, but you're all such brilliant guys at
> restoration, right?
> Any help much appreciated.
> Cheers
> Andrew
Hi Andrew:
Here is what I would look for and try to adjust --- Horizontal
frequency.
This sounds like it is some multiple of the desired (for the monitor)
rate. That's what's getting the multiple images across the width of the
screen.
Also (maybe first, but definitely in conjunction with the above) look
for 'Vertical' frequency/lock. This one is what is getting you multiple
images in the vertical direction. Memory says that the adjustment is
"roll down (image) and just return the adjustment the other direction
till it locks in place."
The 'horizontal lock' is a much courser adjustment.
(This is all standard TV/Monitor adjustment stuff. If anyone has any
specific advice different from this, by all means, give it a try.)
Chuck
--
-----------------------------------------------------------
He, who will not reason, is a bigot; William Drumond,
he, who cannot, is a fool; Scottish writer
and he, who dares not, is a slave. (1585-1649)
While he that does, is a free man! Joseph P. 1955-
-----------------------------------------------------------
(be sure to correct the return address when using 'reply')
Chuck Davis / Sutherlin Industries FAX # (804) 799-0940
1973 Reeves Mill Road E-Mail -- cad(a)gamewood.net
Sutherlin, Virginia 24594 Voice # (804) 799-5803
Something tells me this machine isn't going to be running anytime soon.
Here is what I found when I got into the CPU.
M7090 KD11-Z 11/44 console interface module
M7093 FP11-F 11/44 floating point module
M7094 KD11-Z 11/44 data path module
M7095 KD11-Z 11/44 control module
M7096 KD11-Z 11/44 multifunction module
M7097 KK11-B 11/44 4-Kword cache module
M7098 KD11-Z 11/44 UNIBUS interface
M7762 RL11 RL01/02 disk drive controller
M9902
M7762 RL11 RL01/02 disk drive controller
M8256 RX211 RX02 floppy disk drive control module
M7819 DZ11-A 8-line double-buffered async EIA with modem control
(50 to 96-Kbaud, 64-byte silo)
M7819 DZ11-A 8-line double-buffered async EIA with modem control
(50 to 96-Kbaud, 64-byte silo)
M7800 DL11 Async transmitter & receiver, 110-2400 baud
Based on the info on the cover, the system is missing the following.
M7091 KE44-A 11/44 CIS control store module
M7092 KE44-A 11/44 CIS data path/logic module
M8743 MS11-PB 1-Mbyte ECC RAM
M7521 DELUA-AA UNIBUS to ethernet adaptor
SPC
BC11-25
TO TM11
I've no idea what the last three are, I suspect the 'TO TM11' is actually
the huge ribbon cable that is plugged into the backplane.
I'm assuming that without the M7091 and M7092 that there is no use in
coming up with a RAM board.
Zane
| Zane H. Healy | UNIX Systems Adminstrator |
| healyzh(a)ix.netcom.com (primary) | Linux Enthusiast |
| healyzh(a)holonet.net (alternate) | Classic Computer Collector |
+----------------------------------+----------------------------+
| For Empire of the Petal Throne and Traveller Role Playing, |
| see http://www.dragonfire.net/~healyzh/ |
| For the collecting of Classic Computers with info on them. |
| see http://www.dragonfire.net/~healyzh/museum.html |
Today I found in a magazine called T3 (essentially a high-tech catalog)
a robotic vacuum cleaner just as we discussed recently. It uses radar,
and works kind of like that robotic lawnmower released several year
ago.
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
I finally got a working SCSI card for my Apple //gs, but I now have a
problem booting off of the hard drive.
Here's the setup. CMS SCSI card to Miniscribe 20mb hard drive (old Mac
SE drive). GS/OS 6.0.1 diskettes used to setup the hard drive. All files
copied to hard drive with no errors; files are visible and runable from
GS/OS. Turning off the machine and turning it back on produces a "Check
startup device" error. Booting with the "no harddrive" GS/OS diskette works
fine. All required files are on the hard drive.
It's almost like a boot block is not written to the drive. For
installation instructions, I culled info from Nathan Mate's Apple // web
site.
Any clues?? I installed GS/OS multiple times with the same results.
Thanks!
Rich Cini/WUGNET
<nospam_rcini(a)msn.com> (remove nospam_ to use)
ClubWin! Charter Member (6)
MCP Windows 95/Windows Networking
============================================
