On Wed, Jun 17, 2015 at 12:52:23PM +1200, Mike Ross wrote:
>
> Has this ever been seriously considered, or mooted as a possible
> co-operative venture for a group of us?
>
I see it on the small scale all the time. Such as Rod's new front panels
for the 8/e. Or the various replica kits for early
>
> Date: Mon, 15 Jun 2015 19:42:42 -0400
> From: Michael Thompson
> To: cctech
>
> The M452 creates a 220 Hz clock for the TTY transmitter and a 880 Hz clock
> for the TTY receiver.
> The M405 for the DP12-B serial port generated a clock that is 16x the baud
> rate which is then divided by an M2
>
> The PDP-12 came to us with an M452 for the 110 baud TTY console and a
> home-made adjustable baud rate module for the second serial port. The
> adjustable baud rate generator was made by the original user of the system
> in the early 80s, and is just a crystal, rotary switch and a Fairchild
>
I know I keep pushing the boundary of vintage lately but I wanted to report
to those who care that I finally got my hands on a 1993 Compaq 5/60M - this
is "a if not the" first desktop computer with a Pentium processor installed
stock. it was the 1993 "dream machine - $9000+ It had an EISA bus an
[M452]
> that the original appears to use a 2k 10-turn pot, and a 7440 output buffer,
> neither of which are in my rather extensive junk box.
> In fact the 7440 are rather rare, and I see the cheapest I can get them for
> is around $4.00 each.
True. But you don't need either to build and test the
> Mine too! I just love the old paper books versus PDFs ... and I've got a
So do I. It is a lot easier to filp through a databook than through a collection
of PDFs.
This has 2 uses :
1) If you need to find what a house-numbered part really is, you can quickly
look at possible candidates in th
> >
> > Actually, no. That honour goes to the PSU in a Zenith MDA monitor
> > which as I said 'combines the efficiency of a linear with the reliability
> > of a switcher'. The design (if you can call it that) of this PSU is to
> > rectify the mains, feed it into a free-running chopper circuit, the
I am humbled (yes, it is possible!) got a very nice email from
Homebrew Computer Club moderator / SOL-20 co-developer / Osborne 1 chief
engineer (and many more):
"This book presents the history of personal, portable computing from the
abacus to the present day in a remarkably thorough, ac
> On Jun 16, 2015, at 17:52 , Mike Ross wrote:
> 'remanufacturing' has become part of preservation movements in
> general;
[...]
> Has this ever been seriously considered, or mooted as a possible
> co-operative venture for a group of us?
On this topic, I'm particularly curious about remanufactur
> On Jun 16, 2015, at 3:48 PM, Eric Smith wrote:
>
> Johnny Billquist wrote:
>> Then you can figure out tape speed across the
>> heads (if you care) by just observing flux changes.
>
> Tony Duell wrote:
>> Only if there is something on the tape. These computer tape drives could
>> surely recor
On Wed, Jun 17, 2015 at 1:54 AM, tony duell wrote:
> It's also that this is the 'classic computers' list. To me, classic computing
> means rather
> more than just the hardware. It also covers the design and construction
> methods, technology
> and so on.
DING.
Staying slightly on-topic, worki
> On Jun 16, 2015, at 4:05 PM, Kyle Owen wrote:
>
> On Jun 16, 2015 3:43 PM, "tony duell" wrote:
>>
>> Actually, no. That honour goes to the PSU in a Zenith MDA monitor
>> which as I said 'combines the efficiency of a linear with the reliability
>> of a switcher'. The design (if you can call i
> -Original Message-
> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of tony
duell
> Sent: 16 June 2015 17:29
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: RE: using new technology on old machines
>
>
> > > It's also that this is the 'classic computers'
On 06/16/2015 01:54 PM, Brent Hilpert wrote:
Once ran across a Honeywell drive (7-track) that had a 'vacuum
capstan'. The capstan wheel had a vacuum path through the axle and
then transferred the vacuum out to holes around the perimeter. So
rather than a pinch roller or rubber frictional surface
On 2015-06-16 21:20, tony duell wrote:
And yet another (possibly the most common one on computers) is to have a
small drive wheel that pulls the tape at constant speed across the
heads, and then have some other construction that drives the tape reels
depending on tape tension or length. Think v
On 2015-Jun-16, at 12:31 PM, Paul Koning wrote:
>> On Jun 16, 2015, at 3:20 PM, tony duell wrote:
>> ...
>>> The actual tape movement as such, is all done by the small wheel next to
>>> the head, which just runs the tape past the head.
>>
>> Which is essentailly the same as the capstan in an audi
At 12:30 PM 6/16/2015, Mattis Lind wrote:
>I have compiled a list of them, mostly for my self, so that I somewhat easier
>would find what I look for.
That is a nice list, and includes many that are not among my ~80 (which does
not include my ~60 vacuum tube manuals). Could you post the original
On 6/16/2015 12:01 PM, Sean Caron wrote:
Mine too! I just love the old paper books versus PDFs ... and I've got a
pretty decent collection of databooks both that I have picked up second
hand, as well as a pretty large chunk of those that my dad acquired over
the course of his engineering career w
Mine too! I just love the old paper books versus PDFs ... and I've got a
pretty decent collection of databooks both that I have picked up second
hand, as well as a pretty large chunk of those that my dad acquired over
the course of his engineering career when he was cleaning them out from his
libra
On Jun 16, 2015 3:43 PM, "tony duell" wrote:
>
> Actually, no. That honour goes to the PSU in a Zenith MDA monitor
> which as I said 'combines the efficiency of a linear with the reliability
> of a switcher'. The design (if you can call it that) of this PSU is to
> rectify the mains, feed it into
On 06/16/2015 11:30 AM, Henk Gooijen wrote:
well, the tiny space between the tape and the air bearing could
be regarded a vacuum column, but it's a very short one :-)
The two air bearings are immediately above and below the R/W
and erase head. And they do *not* rotate. The tape glides on
an air
> On Jun 16, 2015, at 09:10 , tony duell wrote:
>
> Incidentally, given the fact that a constant motor speed -> constant tape
> speed, it should be possible to
> make a device to put the timing track on a blank tape for the TU58. Has
> anyone done that?
There's no timing track in the TU58 sch
[Centronics belt-grabbing printer]
> Is that the same screwball printer that has a metal platen spinning behind
> the paper with horizontal raised lines on
> it, and a single vertical striker in the printhead that strikes at the moment
> when the platen and striker intersect at
> the desired
> On Jun 16, 2015, at 12:46 , tony duell wrote:
> For something even madder, look at the design of the original Radio Shack
> 'Line Printer' which was
> actually a Centronics something-pr-other (733?). This thing (which is not a
> line printer at all) has a belt
> running across the chassis wi
Johnny Billquist wrote:
> Then you can figure out tape speed across the
> heads (if you care) by just observing flux changes.
Tony Duell wrote:
> Only if there is something on the tape. These computer tape drives could
> surely record on a
> totally blank tape and get the right number of bits per
> > On Jun 16, 2015, at 12:31 , Paul Koning wrote:
> > Part 1: two capstans spinning all the time, in opposite directions.
> > Solenoid-activated pinch rollers would
> > press the tape against the capstan to set it moving.
> That's also how the magnetic card is moved in and out in the Mag Card
> > Quite probably, but the modern mains-side switcher is more
> > troublesome and a lot less pleasant to repair. I think I'll stick
> > with the room-heater in my 11's :-)
>
> Well, you could use a switcher, paralleled to the mains with a heater.
One reason I want to keep the original supplies i
> On Jun 16, 2015, at 12:31 , Paul Koning wrote:
> Part 1: two capstans spinning all the time, in opposite directions.
> Solenoid-activated pinch rollers would press the tape against the capstan to
> set it moving.
That's also how the magnetic card is moved in and out in the Mag Card II
type
On Tue, 16 Jun 2015, tony duell wrote:
Quite probably, but the modern mains-side switcher is more
troublesome and a lot less pleasant to repair. I think I'll stick
with the room-heater in my 11's :-)
Well, you could use a switcher, paralleled to the mains with a heater.
Just as you can use a C
> On Jun 16, 2015, at 3:20 PM, tony duell wrote:
>
> ...
>> The actual tape movement as such, is all done by the small wheel next to
>> the head, which just runs the tape past the head.
>
> Which is essentailly the same as the capstan in an audio tape recorder,
> albeit the computer
> drive do
On Tue, 16 Jun 2015, tony duell wrote:
Actually, IIRC a USB A male->female cable violates the spec...
The spec forbids extending the cable further?
Or should the spec forbid absolutely any cable,
with absolutely any USB connector on either end?
> >
> >> And yet another (possibly the most common one on computers) is to have a
> >> small drive wheel that pulls the tape at constant speed across the
> >> heads, and then have some other construction that drives the tape reels
> >> depending on tape tension or length. Think vacuum columns or sp
On 2015-06-16 20:34, Johnny Billquist wrote:
On 2015-06-16 20:30, Henk Gooijen wrote:
-Oorspronkelijk bericht- From: Johnny Billquist Sent: Tuesday,
June 16, 2015 8:22 PM To: cctalk@classiccmp.org Subject: Re: On the
Emulation of TU58s
On 2015-06-16 20:20, Chuck Guzis wrote:
On 06/16/20
On 2015-06-16 20:30, Henk Gooijen wrote:
-Oorspronkelijk bericht- From: Johnny Billquist Sent: Tuesday,
June 16, 2015 8:22 PM To: cctalk@classiccmp.org Subject: Re: On the
Emulation of TU58s
On 2015-06-16 20:20, Chuck Guzis wrote:
On 06/16/2015 11:08 AM, Henk Gooijen wrote:
The round (
On 2015-06-16 20:28, Chuck Guzis wrote:
On 06/16/2015 11:22 AM, Johnny Billquist wrote:
Uh... The TU80/TU81 do not have vacuum columns...
I didn't say that they did, Johnny. I said that the TU80 hails back to
the vacuum-column CDC drive design of the 1960s. At least that's my
understanding.
On 2015-06-16 20:23, Mark J. Blair wrote:
On Jun 16, 2015, at 11:22 , Johnny Billquist wrote:
Pretty much the standard CDC vacuum-column design since the 1960s. The
TU80 is, after all, a CDC product. Two counter-rotating capstans--tape
movement is determined by applying positive or negativ
-Oorspronkelijk bericht-
From: Johnny Billquist
Sent: Tuesday, June 16, 2015 8:22 PM
To: cctalk@classiccmp.org
Subject: Re: On the Emulation of TU58s
On 2015-06-16 20:20, Chuck Guzis wrote:
On 06/16/2015 11:08 AM, Henk Gooijen wrote:
The round (approx 2" diameter) "bearings" of th
On 06/16/2015 11:22 AM, Johnny Billquist wrote:
Uh... The TU80/TU81 do not have vacuum columns...
I didn't say that they did, Johnny. I said that the TU80 hails back to
the vacuum-column CDC drive design of the 1960s. At least that's my
understanding.
--Chuck
> On Jun 16, 2015, at 11:22 , Johnny Billquist wrote:
>>
>> Pretty much the standard CDC vacuum-column design since the 1960s. The
>> TU80 is, after all, a CDC product. Two counter-rotating capstans--tape
>> movement is determined by applying positive or negative pressure to
>> ether or both (
On 2015-06-16 20:20, Chuck Guzis wrote:
On 06/16/2015 11:08 AM, Henk Gooijen wrote:
The round (approx 2" diameter) "bearings" of the TU80 do not rotate.
Instead, the metal has tiny holes. Air pressure pushes the tape away
from the bearings. As the tape moves, due to movement pressure, the
tape
On 06/16/2015 11:08 AM, Henk Gooijen wrote:
The round (approx 2" diameter) "bearings" of the TU80 do not rotate.
Instead, the metal has tiny holes. Air pressure pushes the tape away
from the bearings. As the tape moves, due to movement pressure, the
tape comes closer to the air bearing. That is
> On Jun 16, 2015, at 10:54 , tony duell wrote:
> I am pretty sure there is just one physical head on the TU58 drive chassis.
> So if there is a separate erase
> field, it is a second gap in that head.
Correct. Single head with multiple gaps.
>
> Ouch. Good luck in getting that, and even more
On 2015-06-16 19:51, tony duell wrote:
And yet another (possibly the most common one on computers) is to have a
small drive wheel that pulls the tape at constant speed across the
heads, and then have some other construction that drives the tape reels
depending on tape tension or length. Think v
-Oorspronkelijk bericht-
From: Johnny Billquist
Sent: Tuesday, June 16, 2015 7:31 PM
To: cctalk@classiccmp.org
Subject: Re: On the Emulation of TU58s
[... snip ...]
And then we have drives like the TU80/TU81 which do not seem to fit into
any of the mentioned categories. I'm not enti
> And yet another (possibly the most common one on computers) is to have a
> small drive wheel that pulls the tape at constant speed across the
> heads, and then have some other construction that drives the tape reels
> depending on tape tension or length. Think vacuum columns or spring
> loaded a
> That seems to me like it would be the trickiest part. The TU58 schematic
> appears to indicate that there are
I think so. Of course you could cheat by making it a read-only tape. But I
don't like that.
> separate erase head gaps (not on a separate head like in audio cassette
> drives), so
> On Jun 16, 2015, at 09:10 , tony duell wrote:
> You would, of course, not know which track it was reading, so you would have
> to output 2 blocks, one on
> each track, at once. And how would you detect it was writing? Look for an
> extra signal at the coupling head
> or something?
That seems
[Driving tape]
> Another solution is to avoid the problem entirely by not requiring constant
> linear speed. That’s what DECtape
> (the real one) does.
Sure. A number of tape drives were built that way, the HP9865 (and thus the
built-in tape drive on the
HP9830) is another example.
>
> > O
On 2015-06-16 18:21, Paul Koning wrote:
On Jun 16, 2015, at 12:10 PM, tony duell wrote:
As long as we're talking philosophy, what do y'all think about emulating the TU58
drive, vs. emulating the TU58 > *tape*?
I cannot properly express my opinion of that tape cartridge design even if I
v
On 6/16/2015 9:58 AM, Pontus Pihlgren wrote:
On Tue, Jun 16, 2015 at 01:54:56PM +, tony duell wrote:
I find it odd that people want to have a lights-and-switches panel, but are
prepared to totally
adulterate the hardware of the machine that drives it.
Are you honestly suggesting that I
> From: wulfman
> 2.47 per each ic is kinda expensive
US$170 / 420 ICs = US$.40 per IC? (I suspect you swapped the numerator and
demoninator: 420 / 170 = 2.47.)
Seems not too unreasonable. I did order one, we'll see what it looks like
(thanks to the OP for the tip).
> i have 10s of
Mark, I've thought of that for my HP 9845, too. Sure would be nice to
fabricate something that's flexible hardware that can be programmed for the
peculiarities of various implementations. I'll put it on my list of things
to do once I'm done with my dissertation. :-)
On Tue, Jun 16, 2015 at 4:21
> On Jun 16, 2015, at 12:10 PM, tony duell wrote:
>
>>
>> As long as we're talking philosophy, what do y'all think about emulating the
>> TU58 drive, vs. emulating the TU58 > *tape*?
>>
>> I cannot properly express my opinion of that tape cartridge design even if I
>> violate list rules abou
When repairing machines it is some times hard to find the data sheet for a
particular component.
Sometimes google hasn't been able to find the the data sheet for me.
My father worked in the electronics business for his entire career and kept
a lot of the data books that he received.
I have compil
> > It's also that this is the 'classic computers' list. To me, classic
> > computing means
> > rather more than just the hardware. It also covers the design and
> > construction methods, technology and so on. And there seems to be
> > precious little of that in a modern microcontroller acting as
>
> > > Oh, very much! Then we could have a discussion about using
> > > modern switching power supplies ot not ;-)
> >
> > As opposed to the original 11/70 switching supply?
>
> I would suspect that modern switchers are more efficient. If I
> wanted to have one running for any longer extent I w
On Tue, Jun 16, 2015 at 04:18:03PM +, tony duell wrote:
> [Build your own 11/70]
>
> > Oh, very much! Then we could have a discussion about using
> > modern switching power supplies ot not ;-)
>
> As opposed to the original 11/70 switching supply?
I would suspect that modern switchers are mo
[Build your own 11/70]
> Oh, very much! Then we could have a discussion about using
> modern switching power supplies ot not ;-)
As opposed to the original 11/70 switching supply?
-tony
> > Sounds to me like you are more of a victim than a perpetrator here. Isn't
> > there some OSHA regulation against
> > USB A to A cables? :)
> well, you know, it's a different world these days. You go to these places
> down dark alleys, surrounded by shady characters and you can buy them.
O
On 6/16/2015 8:56 AM, Paul Koning wrote:
On Jun 16, 2015, at 2:49 AM, ben wrote:
...
Since the computer I designed is a *small* computer, 8 & 16 bit
operating systems is what I am looking at for ideas. This is a 18
bit cpu with the concept, byte access of memory needs true 18 bit
addressin
>
> As long as we're talking philosophy, what do y'all think about emulating the
> TU58 drive, vs. emulating the TU58 > *tape*?
>
> I cannot properly express my opinion of that tape cartridge design even if I
> violate list rules about use of
> profanity. But the drive itself isn't all that ba
On Tue, Jun 16, 2015 at 03:58:51PM +, tony duell wrote:
> > Are you honestly suggesting that I should rebuild a PDP-11/70
> > from things I have in my partsbin?
>
> You have to admit it would be an interesting and educational
> project :-)
Oh, very much! Then we could have a discussion about
> >
> > I find it odd that people want to have a lights-and-switches panel, but are
> > prepared to totally
> > adulterate the hardware of the machine that drives it.
>
>
> Are you honestly suggesting that I should rebuild a PDP-11/70
> from things I have in my partsbin?
You have to admit it wou
On Tue, Jun 16, 2015 at 01:54:56PM +, tony duell wrote:
>
> I find it odd that people want to have a lights-and-switches panel, but are
> prepared to totally
> adulterate the hardware of the machine that drives it.
>
Are you honestly suggesting that I should rebuild a PDP-11/70
from things
On Tue, 16 Jun 2015, Mark J. Blair wrote:
On Jun 16, 2015, at 08:19, geneb wrote:
On Tue, 16 Jun 2015, Noel Chiappa wrote:
I wish there was some _easy_ way to lay in a stock of the most common TTL
IC's - e.g. some kind of kit one could buy - but alas, I don't know of any.
(Hence my dream o
2.47 per each ic is kinda expensive
but then again i have 10s of thousands of each 74 series part there was
ever made
been collecting on ebay for 15 years and can repair most any old
computer there is
my hobby is old arcade boards and have the largest collection in arizona
some of the tough parts
> On Jun 16, 2015, at 08:19, geneb wrote:
>
> On Tue, 16 Jun 2015, Noel Chiappa wrote:
>
>> I wish there was some _easy_ way to lay in a stock of the most common TTL
>> IC's - e.g. some kind of kit one could buy - but alas, I don't know of any.
>> (Hence my dream of finding and acquiring someon
As long as we're talking philosophy, what do y'all think about emulating the
TU58 drive, vs. emulating the TU58 *tape*?
I cannot properly express my opinion of that tape cartridge design even if I
violate list rules about use of profanity. But the drive itself isn't all that
bad, aside from not
On Tue, 16 Jun 2015, Noel Chiappa wrote:
I wish there was some _easy_ way to lay in a stock of the most common TTL
IC's - e.g. some kind of kit one could buy - but alas, I don't know of any.
(Hence my dream of finding and acquiring someone else's collection! :-)
Suggestions for the source of suc
Again, I wonder if the data retention time decreases as the number of bits
per device increases. Intuitively it should. Mind you, any SD card is
probably
going to be more reliable than a real TU58 tape now :-)
I think that paper tape, used outdoors on a rainy day, is likely to be more
reliable
> -Original Message-
> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of tony
duell
> Sent: 16 June 2015 14:55
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: RE: using new technology on old machines
>
>
>
> > Sure, the pre-manufactured boards can allow
> On Jun 16, 2015, at 2:49 AM, ben wrote:
>
>> ...
>>
> Since the computer I designed is a *small* computer, 8 & 16 bit operating
> systems is what I am looking at for ideas. This is a 18 bit cpu with the
> concept, byte access of memory needs true 18 bit addressing
> and 16 bits is bit small
> On Jun 15, 2015, at 7:10 PM, Sean Caron wrote:
>
> ...
> 4. Madnick/Donovan Operating Systems or Donovan's Systems Programming ...
> were, I imagine, the canon of the 70s and early 80s ... these are written
> mostly with the S/360 in mind …
If it’s written with 360 operating systems in mind,
On Tuesday (06/16/2015 at 07:43AM -0700), Mark J. Blair wrote:
>
> > On Jun 16, 2015, at 07:36, Chris Elmquist wrote:
> > So, now you have to use a Type A to Type A cable to connect this box to
> > your computer.
> >
> > That is just really, really messed up and I honestly tried to make it
> > r
> On Jun 15, 2015, at 9:21 PM, ben wrote:
>
> On 6/15/2015 7:11 PM, Paul Koning wrote:
>>
>>> On Jun 15, 2015, at 8:09 PM, ben wrote:
>>>
>>> On 6/15/2015 4:42 PM, Toby Thain wrote:
>>>
I think Tanenbaum should be fine? A lot of it is fairly
timeless.
>>>
>>> The latest version is
> On Jun 16, 2015, at 07:36, Chris Elmquist wrote:
> So, now you have to use a Type A to Type A cable to connect this box to
> your computer.
>
> That is just really, really messed up and I honestly tried to make it
> right but it was like pushing a rope.
>
> I hope my friends will visit me in
On Tuesday (06/16/2015 at 07:24AM -0700), Mark J. Blair wrote:
>
> > On Jun 16, 2015, at 06:46, tony duell wrote:
> >
> > Again, I wonder if the data retention time decreases as the number of bits
> > per device increases. Intuitively it should. Mind you, any SD card is
> > probably
> > going t
On Monday (06/15/2015 at 10:14PM -0700), Mark J. Blair wrote:
>
> > On Jun 15, 2015, at 21:59, tony duell wrote:
> > Even though there are at least 4 different USB connectors
>
> Ok, you got me there! When I was working for a GPS startup, I used mini-B on
> everything I designed with USB (a
> From: tony duell
> One method that works for me is that if you are buying a fairly cheap
> part, buy 10 of them and put the rest in stock. Or more than 10 if it
> is something really common.
I suspect a lot of us do that - that's why I have tubes of 4164's, etc, for
instance. It
Choosing the larger card is, IMO, the right answer because you don't
actually waste the space, you extend the life significantly because the
wear leveling will spread your 256K across the entire flash region.
The larger that region, the less often you re-write the same cells,
thereby extending the
> On Jun 16, 2015, at 06:46, tony duell wrote:
>
> Again, I wonder if the data retention time decreases as the number of bits
> per device increases. Intuitively it should. Mind you, any SD card is probably
> going to be more reliable than a real TU58 tape now :-)
I think that paper tape, used
> On Jun 16, 2015, at 06:54, tony duell wrote:
> As an aside, when I restore m 11/730 I am in 2 minds as to what to do about
> the microcode load
> device. a TU58 emulator is certainly convenient, but I actually would rather
> get the real tape drives
> working if at all possible. After all tha
> Sure, the pre-manufactured boards can allow you to prototype quickly... but
> I think Tony is kind of bemoaning the loss of the "old way" and I respect
> that ... I kind of miss it myself, even though I wasn't there to experience
> it first-hand ...
It's also that this is the 'classic computer
On Tue, Jun 16, 2015 at 12:20 AM, tony duell wrote:
> [My 11/730]
>
>> Sorry to hear that it's been decabled. Take your time to route those cables
>> through the bottom pan properly,
>
> Yes, it's going to be a lot of work to get it back together.
>
> I think I am going to start (when I have got
On 06/15/2015 09:58 PM, Zane Healy wrote:
Does anyone happen to know what sort of computers Fairchild would have been
using in the late 60's for design work?
Fairchild, even in the 60s had many divisions. Which one are you
thinking of? (Not that I can provide an answer...)
--Chuck
> >
> > I am of course counting all the transistors inside that chip.
>
> Well, that was obvious. But it raises an interesting point, today you
> can cram a whole computer in the footprint of the simplest DIP carrier.
> For the same price point and same reliablity. Is it then overkill if you
> cho
Maybe Univac?
On 6/15/2015 9:58 PM, Zane Healy wrote:
> Does anyone happen to know what sort of computers Fairchild would have been
> using in the late 60's for design work?
>
> Zane
>
>
>
>
--
The contents of this e-mail and any attachments are intended solely for the use
of the named
addr
In my efforts to understand the problem with the Cache/TB Diagnostics I
tried to run it under 11/750 simulator in SimH. It fails too!
ECKAL -- VAX 11/750 Cache/TB Diagnostic
HALT instruction, PC: 2608 (MTPR #F,#26)
Although not the same location.
On the real machine:
@?ECKAL -- VAX 11/750 C
On Tue, Jun 16, 2015 at 04:28:16AM +, tony duell wrote:
>
> I am of course counting all the transistors inside that chip.
Well, that was obvious. But it raises an interesting point, today you
can cram a whole computer in the footprint of the simplest DIP carrier.
For the same price point an
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