>Sorry, I was totally confused when I posted that. One is an Apple ][
>Europlus (Eurostar is the train which goes under the sea to France :) and
>the other is a //e. They appear to have _totally_ different motherboards
>so I don't know if they are variants of the same beast or not. I know
>nothing about Apples prior to the Mac but am keen to learn - the
>attraction of this hobby to me is to play with things which I know nothing
>about.
The Eurplus is basically an Apple II+. Thus, the "plus" in its name.
Tom Owad
--
Sysop of Caesarville Online
Client software at: <http://home.earthlink.net/~tomowad/>
>> cards in them I suppose I will have to wait until I can scrounge one.
>
>I have 4million of those. Tell me I'm beautiful and I'll send you one.
You're weird
>
>Sam Alternate e-mail:
dastar(a)siconic.com
It's very likely that no commercial utility will work on this board, it
probably shipped with its own chipset-specific drivers.
There were some alternative drivers such as The Last Byte, but they worked
only on certain 286 chipsets (e.g. C&T)
Kai (for whom EMS was once a technical specialty, boy that brings back
painful memories)
-----Original Message-----
From: Russ Blakeman [mailto:rhblake@bbtel.com]
Sent: Monday, August 10, 1998 3:28 PM
To: Discussion re-collecting of classic computers
Subject: Re: EMS/XMS memory driver needed
Marvin wrote:
> Russ Blakeman wrote:
> >
> > Someone I know has just acquired a motherboard, XT type aftermarket,
> > with 768k onboard ram. I'm fairly sure the system is going to need a
> > special driver to access the memory over DOS's 640k. Anyone have such
> > an
> > animal and can attach it to email or know of a commercial program that
> > will handle the job?
>
> Quarterdeck used to offer a program called QRAM (IIRC) that would allow
> more than the 640K Ram to be used. I know it would work with 286
> computers, but don't know about XTs.
We'll try anythig until he gets it right. At one time this stuff was so
commonplace that even after years with it I forget what and where.
--
--------------------------------------------------------------------
Russ Blakeman
RB Custom Services / Rt. 1 Box 62E / Harned, KY USA 40144
Phone: (502) 756-1749 Data/Fax:(502) 756-6991
Email: rhblake(a)bbtel.com or rhblake(a)bigfoot.com
Website: http://members.tripod.com/~RHBLAKE/
ICQ UIN #1714857
AOL Instant Messenger "RHBLAKEMAN"
* Parts/Service/Upgrades and more for MOST Computers*
--------------------------------------------------------------------
With these beasts I was also given a centronics printer cable but there
seems to be nowhere to plug it in. Is this something which also needs an
interface card?
Regards
Pete
>Hi all,
>
>I'm moving soon, and want to get my old CoCo3, monitor, disk drive, and
more
>to a good home. I live in the Laurel, Maryland area, and the whole
>kit-and-kaboodle is yours for free -- all you have to do is email me at
>
>russett(a)russettweb.com.nospam
>
>(remove .nospam)
>
>to arrange the pick-up. The CoCo3 and monitor work great. I'm not sure if
>the disk controller is still working. I also have the old RS-232 interface
>cartridge, hi res joystick interface (I think I can find it), and two or
>three games to give away.
>
>Thanks,
>
>...Allen
>
>
>
>
The LISA (1) originally shipped with dual 5 1/4" floppy drives which
were nick-named twiggy drives. I don't have all the gory details but
Apple manufactured these drives and they were a disaster. All the
information you need can be found at Eric Smith's web site entitled
Twiggy Disk information:
www.brouhaha.com/~eric/retrocomputing/lisa/twiggy.html
Marty
______________________________ Reply Separator
_________________________________
Subject: Re: Lisa battery leakage??
Author: classiccmp(a)u.washington.edu at internet
Date: 8/10/98 3:36 PM
[Twiggy]
What's a twiggy?
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Date: Mon, 10 Aug 1998 12:33:27 -0700
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From: "Daniel A. Seagraves" <DSEAGRAV(a)toad.xkl.com>
To: "Discussion re-collecting of classic computers"
<classiccmp(a)u.washington.edu>
Subject: Re: Lisa battery leakage??
In-Reply-To: <v04011710b1f3f04e4406(a)[207.220.32.133]>
X-Listprocessor-Version: 8.1 beta -- ListProcessor(tm) by CREN
>Hmmmm, now this sounds ponentially very cool! According to the Field
>Guide this is a "Dilog ST-506 emulation of four RL01/02". Any one have
>info on this, and will it work in a system that has actually RL02 drives
>attached? It would make it a lot easier to get data on to the Hard Drive
>if I can just copy it from a RL02 to a fake RL02.
They should work, but only if you set them up to run at an address
different from the standard address for RLseries disks.
>How well do Boards with Boot ROMs co-exist with systems with another set
>of Boot ROMs? I'm threatening to throw the DQ606 in the 11/23 that I'm
>working on, so I can access the rack of drives that go with the
>controller.
Depending on the boot rom, a standard address is 773000. You can't have
two sets of boards which respond the this address (and there isn't a
standard I am aware of for assigning alternate boot code to an address).
On systems which I have configured which had boot code on the controller
card, the standard boot code had to be disabled.
Megan Gentry
Former RT-11 Developer
+--------------------------------+-------------------------------------+
| Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry zk3.dec.com |
| Unix Support Engineering Group | (home): mbg world.std.com |
| Compaq Computer Corporation | addresses need '@' in place of ' ' |
| 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 don't really trust the one RX-50 drive I've got, and I seem to recall
that it is possible to hook up a 1.2Mb floppy from a PC drive as 1/2 of a
RX-50 drive. Is there anything special that needs to be done, or do I just
plug it in?
Zane
| Zane H. Healy | UNIX Systems Adminstrator |
| healyzh(a)ix.netcom.com (primary) | Linux Enthusiast |
| healyzh(a)holonet.net (alternate) | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| and Zane's Computer Museum. |
| http://www.dragonfire.net/~healyzh/ |
Please pardon if this has already been answered... I've been away for
a week at the Worldcon (world science fiction convention)
>I have a really compact "PDP-11/23S" chassis that has an 18-bit Q-Bus
>backplane (4xQuad) in it. Although the circuitry for the Q-Bus is on
>traces of a PC card, there are also wirewrap pins extending out from
>the backplane. Am I naive to assume that I can convert this to a
>22-bit Q-Bus by wirewrapping four or so lines? Any pointers on how to
>do this or on technique?
Not naive at all... I've done it on at least one of my H9270 backplanes
at home... I know of many others who have as well. If I remember
correctly, you need to buss the BC-BF lines (and for Q-Q backplanes,
DC-DF), but I would have to verify this...
Megan Gentry
Former RT-11 Developer
+--------------------------------+-------------------------------------+
| Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry zk3.dec.com |
| Unix Support Engineering Group | (home): mbg world.std.com |
| Compaq Computer Corporation | addresses need '@' in place of ' ' |
| 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 |
+--------------------------------+-------------------------------------+
On Aug 10, 6:42, Ethan Dicks wrote:
> Subject: Re: DQ614 and other Q-Bus questions
> On Sun Aug 9, 15:20, Zane H. Healy <healyzh(a)ix.netcom.com> wrote:
> > Hmmmm, now this sounds ponentially very cool! According to the Field
Guide
> > this is a "Dilog ST-506 emulation of four RL01/02".
Yes, it is. I think I might have been responsible for that highly
informative entry ;-)
> > Any one have info on
> > this, and will it work in a system that has actually RL02 drives
attached?
> > It would make it a lot easier to get data on to the Hard Drive if I can
> > just copy it from a RL02 to a fake RL02.
>
> Presuming that it can be strapped at the alternate address (DLB0 on a
uVAX,
> for example. Dunno the CSR), it should work fine.
It needs a different PROM to switch the address/vector. The standard PROM
at U38 is labelled 91265D (according to my old notes) and the
alternate-address PROM is labelled 91578A (old notes again). YMMV :-)
> > What kind of Hard Drives will work with it?
>
> The one I have used to have a Rodime 10 Mb 5.25" full-height MFM drive
> attached to it. I'd love to hear if an ST-251 would work.
Again, it should. It should be capable of using up to two ST-412 interface
drives to emulate up to four RL02s, though I never tried mine with more
than one. IIRC there's a small overhead, so you need slightly more than
20MB to emulate two drives.
> > Is there any kind of setup for it? There is a funky 20-pin connecter
> > marked J3 that might be for jumpers or a ribbon cable though I don't
really
> > want to try to attach a ribbon cable to it, as it's rather wierdly
attached.
>
> It's an ST-506 interface - 20 pin for analog data (one per drive, up to 4
> supported, depending on the exact nature of the controller in question),
> and 34 pin (digital signals) for control (one per controller, including
> up to 4 drive select wires).
Two physical drives, in this case.
> > Does it have any kind of boot ROMs?
>
> Almost certainly not. It is a register-level emulation of the RLV11 or
RLV12
> (don't know which one). It would use the regular DL boot ROM on your
system.
It does have a bootstrap, but I think the emulation is RLV11 (it's to old
to be RLV12, I think). You can switch the bootstrap off, though. The code
will boot either a DY or DL device.
> > Any idea on how well it would co-exist with a DQ606?
>
> No idea.
Me neither. I don't have the full docs, just a pair of layout diagrams,
switch table, and a few bits about formatting. Unfortnately, all the
formatting stuff seems to use a program which I don't think I have handy.
At the back end of the board is either a 34+20 pin connector, or two
individual headers. As Ethan said, the 34-way is the control bus
(daisy-chained like floppies for multiple drives) and the 20-way is the
data. J3 is the second 20-pin data connector (for the second physical
drive). Pin 1 of the 34-way connector is the end nearest the LED, and the
other connectors are fitted in the same orientation.
There are five switches:
S1 ON = ECC used to transparently correct errors where possible
OFF = ECC ignored; used for diagnostics
S2 ON = bootstrap enabled
OFF = bootstrap disabled
S3,S4 Identify the last logical RL unit on physical drive 0. So
the settings are as follows:
S3 S4 Physical 0 Physical 1
off off DL0 Dl1, DL2, DL3
off on DL0, DL1 DL2, DL3
on off DL0, DL1, DL2 DL3
on on DL0, DL1, DL2, DL3
S5 ON = use secondary address for bootstrap ROM: 175000
OFF = use primary address for bootstrap ROM: 173000
Factory setting is all switches off.
There are 10 jumpers:
JP1 (near U22) removed (etch cut) allows data loopback for diagnostics.
JP2 (near U32) removed (etch cut) aborts controller pre-comp logic when
writing, for diagnostics.
JP3,4,5 (near U70) sets interrupt levels:
level JP3 JP4 JP5
4 B-C B-C B-C
5 B-C B-C A-B
6 B-C A-B B-C
7 A-B A-B B-C
JP6 (near U22) "Must be removed"
JP7 (near U22) "Must be removed"
JP8 (near U5) "Must be removed"
JP9 (near U32) "Must be installed"
JP (near U32) "A-B must be installed, A-C must be removed"
There's also a socket for a special (customer) bootstrap at U38.
That's about all I can tell you, I'm afraid. I'll have a look for a copy
of the formatting program (which came on an RT11 floppy, I think) but I'm
not hopeful... I don't have the controller any longer.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
