At 08:42 PM 2/25/98 +0000, you wrote:
>Yuck!!! Why on earth would anybody want to do that? If you want a machine
>that's not available, then recreate it using parts as close to the
>originals in function as possible, sure (as an example, say you couldn't
>get any 2102 1K*1 RAMs. Use 2114 1K*4 RAMs instead - just a quarter of
>the number). But to use the logic board out of some other machine
>attempting to emulate a classic is plain stupid.
Look, opinions differ. No need to get ugly about it. Different aspects are
more important to different people. I won't try to defend my position here,
you win, I'm stupid. There. Now isn't that better than a flood of messages
back and fourth?
>> Power on - BEEP
>That should be a two-tone beep. It's the standard BBC power-up sequence.
Ok... bEEP...BEEP!
>In mode 7, 1 byte of video memory corresponds to 1 character on the
>screen. So it looks like you have a problem with address line MA6 from
>the 6845. If you can borrow a logic probe, look at pin 10 of the 6845
>(look at 8, 9, 11 as well, in case I've miscounted) - there should be a
>square wave (pulsing) there, and then trace it through IC36c (again,
>there should be pulsing at pin 8 of this chip).
Will be a while before I can borrow a logic probe. However, removing and
reseating the 6845 has had no effect on the problem.
To be continued...
A
On 2/24/98, Tony Duell wrote:
{snip, snip about the DEC KM11 maintenance card}
Tony:
I took a look at the KM11 diagnostics card and compared the pinout to
the Unibus pinout that was posted on the list in the last week. First off,
do you think that the KM11 will work on an 11/34??
Anyway, I'm not clear as to whether the function descriptions that I
have match what the KD11 is supposed to use:
1. bus pin B1 (I'm assuming that that's really pin AB1) is BIRQ6
(according to
the post last week), but is shown supplying 8v to the display
drivers.
2. The switch S1 is shown providing a ground path on closure to pin
AB2.
According to the previous post, AB2 is a -12v supply rail.
3. Switch S2 is feeding pin AV2, which is BDAL01.
4. Switch S3 is debouncing pin AA1, BIRQ5.
5. Switch S4 is debouncing pin AU1, PSpare1.
Hopefully I'm looking at the right diagram!
Rich Cini/WUGNET
<nospam_rcini(a)msn.com> (remove nospam_ to use)
ClubWin! Charter Member (6)
MCP Windows 95/Windows Networking
============================================
Hello all,
I just aquired a "Motorola Memory Systems MEK6802D5" single board
computer. It appears to be a 6802 evaluation or prototyping unit. It
has a hex keypad and a 6-digit HEX display. In my old Motorola
literature, I can find a reference for a MEK6802D3 from 1979, which
appears to be an older version of this. The date code on the chips
places it at circa 1980.
Does anyone have any information on this unit? Any idea where I can get
any documentation or programming info? It appears to be fully functional
(at least, I get a display, and I can page up and down through memory
examining and changing contents, etc).
Any info would be appreciated.
___ __ __ __ _ _ _ _
|_ _|__ _ _ _ | \/ / _| | __ _ _ _ __ _| |_ | (_)_ _ Okanagan
| |/ _` | ' \ | |\/| \__| |_/ _` | | / _` | ' \| | | ' \ Internet
|___\__,_|_||_| |_| |_| |___\__,_|___\__, |_||_|_|_|_||_| Junction
Network Operations Centre |___/ Phone +1 (888) 944-INET
Tried to order one today - Walnut Creek discontinued this product
a couple of weeks ago. Lousy timing, eh? Does anyone know of a
third party vendor that might have some available?
Thanks,
Jason Brady jrbrady(a)mindspring.com Seattle, WA
tim shoppa:
:But you can't just run an Apple I emulator on the Apple II. The
:memory maps are completely different and the video chain of the
:Apple I is radically different than any home micro designed since
:the late 70's (i.e. it is *not* a memory-mapped video system; it's
:closer to a dumb terminal bolted onto a 6502. Well, a really dumb
:dumb terminal :-) )
hell, you can emulate anything on anything. it'd just mean you had to
emulate a 6502 on a 6502 and trap the pesky screen-write instructions.
then again, some things are better left undone... ;> for the benefit of
the unenlightened (ie. communa), could you please decsribe the
principles of the apple i's video system? thanks.
(or point us in the direction of such a description.)
-- Communa (together) we remember... we'll see you falling
you know soft spoken changes nothing to sing within her...
Net-Tamer V 1.08X - Test Drive
jeff said
:Oh man, now you're talking! I really wanted to Use Arachne as my
:web browser, but I could never get the TCP/IP package to work
:(either KLOS, or the other one whose name escapes me).
we had good results with DOSPPP, the conversions of the linux daemons.
they should be available on simtel. very good; haven't let us down yet
(except when the machine we run gets confused about which com ports it
has and hasn't got). and you can put pppd and comtool in your dos
directory and build a dialling batch file without lots of little bitty
files lying around :>
arachne is a good browser, yes (someone mentioned webspyder - that's
just arachne rebadged, isn't it?) but we got annoyed with the resources.
now we use a combination of htget and kevin solway's vh if we're
reading, or nettamer if we're searching.
-- Communa (together) we remember... we'll see you falling
you know soft spoken changes nothing to sing within her...
Net-Tamer V 1.08X - Test Drive
I noticed it all right.... only off by the make of computer and 5
years... *sigh* <gag> <choak>
-Matt Pritchard
Graphics Engine and Optimization Specialist
> -----Original Message-----
> From: bill_r(a)inetnebr.com [SMTP:bill_r@inetnebr.com]
> Sent: Tuesday, February 24, 1998 8:36 AM
> To: Discussion re-collecting of classic computers
> Subject: IMSAI 8080 <> TRS-80
>
> Did anyone besides me notice that, judging by their ad in the latest
> issue of Computer Gaming World magazine, the software division of
> Metro Goldwyn Mayer (MGM INTERACTIVE INC.), producer of the original
> "Wargames" motion picture, doesn't know the difference between an
> IMSAI 8080 and a TRS-80? Their ad goes something like "In 1983, a
> teenage computer hacker almost destroyed the world with one of these:
> [picture of TRS-80 Model 1, with caption reading 'TRS-80, 4K RAM, no
> hard drive']". It goes on to talk about how much damage he could do
> with today's computers (go figure), and introduces their new
> "Wargames" computer game. Maybe the marketing department should jog
> down to the film vault and watch the movie, because _it_ used an IMSAI
> 8080 with a piece of paper stuck over the name for the young
> "hacker's" computer. Sheesh.
>
> -Bill Richman
> bill_r(a)inetnebr.com
> http://incolor.inetnebr.com/bill_r
> (Home of the COSMAC Elf Simulator!)
What would be nice is an ELKS-like thing for DOS, so that one could
stick in a floppy disk, and it would boot into any program that you
choose, without Command.Com. This would be great for web browsers.
But I really don't get this emphasis on making multimedia kiosks with
weird software combos! Every other OS page is about this, and I would
like to see something besides using DOS to sell clothes...
>>QNX is a very small micro-kernel OS that has the look of Windows 95,
has
>>builtin TCP/IP networking, a notepad, a few other little doodads, and
to
>>top it off, a fully functional HTML 3.2 compliant web browser. Also
>
>Okay, QNX sounds pretty cool, but I hafta throw my vote in for Arachne.
>Graphical DOS web browser runs on anything, I think, and works great.
I
>found it when I was looking for something to preview my web pages in (I
do
>'em in a DOS Editor).
>
>
>---------------------------------------------------------------------
O-
>
>Uncle Roger "There is pleasure pure in being mad
>roger(a)sinasohn.com that none but madmen
know."
>Roger Louis Sinasohn & Associates
>San Francisco, California
http://www.sinasohn.com/
>
>
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
----------
From: DAVID FRITZKE
To: displaywriter
Subject: still want one??
Date: Wednesday, February 25, 1998 1:22PM
Hey,
I have an IBM displaywriter system I am looking to unload.
I thought I'd spend a second trying to find somebody who may
want one, and I ran across your address. I've got the whole
works, manuals, disks galore "toaster" floppy drive (what
is up with the dual cables??) I was hoping to find a driver
for the hammerhead printer so my Dad could use it with his
"new" 486dx33 and Microsoft word. The printer has a standard
serial connector, so I was hopin'...........???
dave
PS I wish I still had my Zenith PC2, sigh.
