On 24/05/2016 22:41, Glen Slick wrote:
On Tue, May 24, 2016 at 2:29 PM, Rod Smallwood
wrote:
Hi
My main system a VAX 4000 Model 500 with a KA680 CPU has just started
halting at test 51 on power up.
Does any body know where I can lay my hands on a spare KA680?
A month ago this one wen
On Tue, May 24, 2016 at 3:09 PM, Brent Hilpert wrote:
> Yes, I examined this in some detail last year after mention on the list, and
> wrote it up:
> http://www.cs.ubc.ca/~hilpert/e/corerope/index.html
That's a great write-up! Thanks!
I'm not sure about how IBM TROS was driven, but the
> On May 24, 2016, at 8:30 PM, Eric Smith wrote:
>
> On Tue, May 24, 2016 at 3:09 PM, Brent Hilpert wrote:
>> Yes, I examined this in some detail last year after mention on the list, and
>> wrote it up:
>>http://www.cs.ubc.ca/~hilpert/e/corerope/index.html
>
> That's a great write-up!
A fellow has made up a nice adapter to read and write Commodore disks on
a PC via USB using a 1541 drive.
The thing that jumped out at me is that this is a 5 1/4" drive that
reads and writes via USB. Anyone want to comment on whether the
floppies it accesses would be useful other than on th
On 2016-05-24 9:30 PM, Eric Smith wrote:
On Tue, May 24, 2016 at 3:09 PM, Brent Hilpert wrote:
Yes, I examined this in some detail last year after mention on the list, and
wrote it up:
http://www.cs.ubc.ca/~hilpert/e/corerope/index.html
That's a great write-up! Thanks!
I'm not sure
On 05/24/2016 11:54 AM, Swift Griggs wrote:
Oh and here is a replica of an Apollo launch computer with
a component LED display like I was mentioning:
http://i.imgur.com/bbXZVcx.jpg ... probably too expensive
to embed in a computer system, but still hard to beat for
geek aesthetics. -Swift
Tha
On 05/24/2016 11:56 AM, Swift Griggs wrote:
On Tue, 24 May 2016, Jon Elson wrote:
The early PDP-11s had a diode matrix ROM for the boot memory. You could
change the boot code with a wire cutter and soldering iron.
Is that similar to "wire wrap" ? I remember my grandmother talking about
having
> A fellow has made up a nice adapter to read and write Commodore disks on
> a PC via USB using a 1541 drive.
>
> The thing that jumped out at me is that this is a 5 1/4" drive that
> reads and writes via USB. Anyone want to comment on whether the
> floppies it accesses would be useful other t
On 05/24/2016 12:17 PM, Paul Koning wrote:
A couple of observations.
Taking the PDP-11 as a fairly typical example, the switches are "data" and
"address". While running, the data switches were visible to the software, and could do
something if you wanted to (typically this wasn't done).
Actua
On 05/24/2016 01:22 PM, Al Kossow wrote:
On 5/24/16 10:44 AM, Chuck Guzis wrote:
There was also automated "stapled wire". I forget the name for the process.
stitch wire
you spot weld to a socket post
No, there was another system made by AMP. The backplane
connectors had rectangular po
On 05/24/2016 02:13 PM, Chuck Guzis wrote:
I seem to recall that reworking the 360/30
microprogramming was preferred by tinkerers over the
360/40 was primarily that CROS was easier to work with
than TROS. I don't recall what the RCA Spectrolas used.
And the 360/25 had all writeable control stor
On 05/24/2016 02:15 PM, Eric Smith wrote:
On Tue, May 24, 2016 at 1:08 PM, Chuck Guzis wrote:
Yes, but there was a trademarked name for the process that slips my
mind. Capable of very high densities.
Multiwire?
No, multiwire is a process where lots of wires are laid down
on a PC board coat
On 05/24/2016 02:33 PM, Brent Hilpert wrote:
On 2016-May-24, at 12:08 PM, Chuck Guzis wrote:
On 05/24/2016 11:22 AM, Al Kossow wrote:
On 5/24/16 10:44 AM, Chuck Guzis wrote:
There was also automated "stapled wire". I forget the name for the
process.
stitch wire
you spot weld to a socket po
On 05/24/2016 07:05 PM, Jon Elson wrote:
> And the 360/25 had all writeable control store. The control store
> was just the top 16 KB of main core memory! To change emulators,
> restore from a microprogram crash, etc. you loaded the emulator from
> a card deck!
Yes, a neat little machine, no
On 05/24/2016 05:44 PM, Chuck Guzis wrote:
On 05/24/2016 02:21 PM, Paul Berger wrote:
The CROS cards used in a 360/30 where the same size as an 80 column
card on purpose so you could you a keypunch machine to program the
microcode.
But I believe that the CROS cards were mylar, no?
On the 360
Worked a couple of years ago, but now won’t power up.
Chris
On 5/24/2016 3:32 PM, Swift Griggs wrote:
On Tue, 24 May 2016, Fred Cisin wrote:
(OB_Picky: Due to the overlap of segment and offset, on machines that had 21
address bits, real mode actually had a maximum of 1114096 (10FFF0h) bytes,
instead of 1048576 (10h).
This was always the biggest pu
On 05/24/2016 09:29 PM, Chuck Guzis wrote:
On 05/24/2016 07:05 PM, Jon Elson wrote:
And the 360/25 had all writeable control store. The control store
was just the top 16 KB of main core memory! To change emulators,
restore from a microprogram crash, etc. you loaded the emulator from
a card de
The USB-to-1541 interface is really no different than the parport-to-1541
interfaces, other than they use different hardware-level drivers to talk to
the C= 1541.
All of the later CBM floppy drives are (as mentioned) "intelligent
peripherals". They are nothing short of computerized appliances, con
On 05/24/2016 08:48 PM, Jon Elson wrote:
> For sure! The 360/30 was an 8 BIT machine, 8-bit memory, 8-bit data
> paths, etc. Really hobbled the performance, and restricted the
> peripherals that could be attached. The models /22 and /25 had 16-bit
> memory and data paths.
Do you mean the 360/2
On 24.05.2016 16:25, David Collins wrote:
Here are the binaries for all the EPROMs on processor PCA for my 7596A.
Wow, that was really quick, thank you so much!
The
PCA part number is 07595-60100 and is different from the one in the manual
which is a 07595-60200 so I assume my PCA is older t
Sean Conner writes:
> From a hardware perspective, the 68000 had a 16-bit bus and 24
> physical address lines
Actually 23 address lines to select a 16-bit word in memory, plus UDS
and LDS to select upper byte/lower byte/word.
101 - 122 of 122 matches
Mail list logo
