< I just picked one of these up with the base station that houses a Seagat
< ST-251 40 meg hard drive with DOS 6.20 installed! Wacky. It also has
< 5.25" floppy drive vertically oriented next to the CRT.
The disk box was an afterthought. It was mostly for modems and other add
ons. Their big feature was a LANCE chip for eithernet running PCSA (later
called pathworks) networking to vaxen via decnet/lat protocals.
< Its a very nice 286 machine, but what a pitiful computer considering it
< came from DEC.
Since it's primarly aim was a diskless dos workstation off of vaxen and
dec was still trying to sort out if they were committed to PCs at all it
was a rather interesting machine.
Allison
The 34-pin control cable for ST-506 interfaces can either have a twist
or be straight through where you need to alter the HDD drive selects
accordingly.
The 34-pin control cable used on ST-506 interfaces doesn't care
whether it lives in a PC PC/XT or PC/AT environment.
Marty
______________________________ Reply Separator
_________________________________
Subject: Re: ESDI Cabling
Author: classiccmp(a)u.washington.edu at internet
Date: 10/1/98 3:55 PM
> The only thing in PCs I know of that use a twist cable is Floppies.
The AT MFM disk control cable (for ST506-like hard disks) certainly has a
twist in it. This twist swaps over 2 of the drive select lines between
the 2 drives, so they can both be set to the same drive number. I will
have to get the manual if you want the exact details.
I think the XT control cable does as well. I have an XT somewhere with 2
ST412 drives (in the 5161 expanasion box) but I'd have to dig it out to
check if the cable has the twist.
>
> Allison
>
>
-tony
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From: ard(a)p850ug1.demon.co.uk (Tony Duell)
To: "Discussion re-collecting of classic computers"
<classiccmp(a)u.washington.edu>
Subject: Re: ESDI Cabling
In-Reply-To: <199810010124.AA26688(a)world.std.com> from "Allison J Parent" at
Sep 30, 98 09:24:50 pm
Content-Type: text
X-Listprocessor-Version: 8.1 beta -- ListProcessor(tm) by CREN
< Is it possible to make regular Mouse-System-Clone bus mouse or Sun Mice
< work on a DEC Vaxstation 3100 -- or does anyone have a source of
< the DEC mice?
I don't think so.
Allison
< And of course DECsystems might be 36 bit (DECsystem-10 for example), 32
< (DECsystem 5500) or something else (wasn't there a DECsystem based on
< either an -8
< or -11? for word processing). I also seem to recall that there were Inte
< based DECstations too....
There were two different DEC systems for word processing:
WPS 100 and 200 series were PDP-8E or 8A cpus
WPS78 6100 CMOS version of PDP-8
DECmate later version of the CMOS based word procesors using the 6120
version of the CMOS PDP-8 on a chip.
A possibly incomplete list of DEC systems and what the cpu was used...
more or less. These are all "chip" based so it leaves out the PDP-1
through 15 series machines.
DECMATE series 6120 processor (a PDP8 in CMOS)
VAXmate Intel 80286 oriented as diskless PC workstation for vaxen.
DECstation MIPS series
Rainbow 8088/z80
Pro3xx PDP-11 (f11 or J11 chips)
PDT-11 series KDA11 (LSI-11 series)
Falcon T-11 series pdp-11 chip
Vt180 (AKA Robin) Z80
MicroVAX
VAXstation
VAXserver These are VAX systems based on Microvax, CVAX, NVAX and
later 32bit VAX based chips.
Alpha 64bit archetecture and the chip series based on it.
Allison
This message was supposed to have gotten here a while ago, but it never did.
Myself and a few other individuals are actively working on a KL-10 emulation.
The project is named e10, and is 3.99% finished. I'm busy confusing myself
with 36-bit math right now. Anyway, help would be nice to complete this
fscker. It's being written in C for Unix platforms, it's under the GPL.
Please don't email me and tell me how stupid this is, or how I'm never
going to finish, I'm trying my damndest to maintain the Never-Give-Up
attitude. I plan to be winning by Y2K. Anyway, does anyone want to help out?
I generated a web page (Using vi, of course...) at bony.umtec.com, and
the current source can be had from there via FTP in /pub/ka10/*.
Any help at all would be appreciated.
-------
< Allison, just how compatable were the Rainbow and Decmate ll.
With what? if each other the answer is not at all. The Rainbow
was sorta PC(ish) using z80 and 8088. The DECMATE used a PDP-8
cpu reduced to a chip. Differences, PDP-8 is a 12bit machine
and the other two should be familiar.
< I have a Decmatell Word Processing 2 book manual no disks and
< another Decmate Hardware Configuration Manual with a System
< Test Disk and a system overview disk which I have viewed on my
< "Bow. From all the diagrams they were identical in appearance and
< seemed to have used the same keyboard and monitor. IIRC from
< the R'bow fido docs I downloaded from the Finnish site the Bow
< could use SCO UNIX (?) Was the 'bow able to access the mini's ?
The used a similar box, same Floppy (RX50), if it was installed the
same 5/10mb hard disks, monitor and keyboard as those were all coperate
standards for that era. other wise they were three different machines
(the pro350 was similar style and peripherals).
Allison
Kai Kaltenbach <kaikal(a)MICROSOFT.com> wrote:
> To the best of my knowledge, there was no Windows 1.00. As I recall, we
> released 1.03 as the first version.
MSKB article ID Q32905 "Windows Version History" makes reference to
Version 1.01 dated 11/85 (it is the first version listed), followed by
1.03 dated 8/86.
-Frank McConnell
< The only PC ESDI controllers I have ever found all have 2 data cable
< connectors (20 pin on the card), which can each connect to one drive onl
< same as MFM. In fact right now I can't think of any differences between
< and MFM cabling for PC's. Not sure about the twist details though.
EDSI does not generally use the twist unless that was a PC hack. The
Ultrastor EDSI controllers I hav elaying around use the esact cabling
as a pair of MFM drive on a WD 1003/5/6 controller.
The only thing in PCs I know of that use a twist cable is Floppies.
Allison
Is it possible to make regular Mouse-System-Clone bus mouse or Sun Mice
work on a DEC Vaxstation 3100 -- or does anyone have a source of
the DEC mice?
Bill
+---------------------------------------------------------------------------+
| Bill and/or Carolyn Pechter | pechter(a)shell.monmouth.com |
| Bill Gates is a Persian cat and a monocle away from being a villain in |
| a James Bond movie -- Dennis Miller |
+---------------------------------------------------------------------------+
ESDI cabling is definitely the ST506/412 interface used on old MFM
(e.g. Seagate ST-225) or RLL (e.g. Seagate ST-238). If the 34-pin
control cable is straight through (without the twist) select drive 0
if the selection is 0 and 1. If the selection is drive 1 and 2, select
drive 1 (nomenclature varies among manufacturers). Ensure the
terminating resistors are installed or you are asking for trouble.
If the 34-pin control cable has a twist and you have only one drive
attached to the end of the cable with the twist, use drive select 1 if
your drive nomenclature is 0 and 1. If the drive select nomenclature
is 1 and 2, select drive 2 and make certain you have the terminating
resistors installed.
Two drive scenario:
34-pin control cable with twist, drive at end of cable with twist use
drive select 1 if drive has 0 and 1 as drive selects or 2 if using 1
and 2 drive selects and again ensure the terminating resistors are
installed in this drive. The drive in the middle of chain should use
drive select 1 if drive has 0 and 1 as drive selects or 2 if using 1
and 2 drive selects (yes, use the same drive select as the C: drive
attached to the end of the cable) and make certain the terminating
resistors are removed from this drive which will be seen as D: drive.
If the 34-pin cable has no twist, C: drive is set for 0 (if drive
selects are 0 and 1) or 1 (if drive selects are 1 and 2) and
connected at the end of the cable with the terminating resistors
installed; D: drive is set for 1 (if using drive selects 0 and 1) or 2
(if using drive select 1 and 2), connected in the middle of the chain
and must have the terminating resistors removed.
Marty