On Sat, Jan 1, 2022, 12:33 Paul Koning via cctalk
wrote:
> Largely true, but some disk drives (RP06? RP04?) use 3-phase spindle
> motors.
>
The RP06 has 3-phase power input (and output, phase-rotated, for a second
drive), but uses a single phase spindle motor. The US version runs the
spindle be
On Tue, Jan 4, 2022 at 8:36 PM Grant Taylor via cctalk <
cctalk@classiccmp.org> wrote:
> My limited understanding is that VFDs simulate / emulate various
> frequencies by turning the output on and off (at full input voltage)
> such that the (sliding) /average/ of the output looks like it's a at a
On Thu, Jan 6, 2022, 08:45 Mike Katz via cctalk
wrote:
> There was also a 1K by 4 version of this tube.
>
I've never seen any info on a 1K*4 Selectron, but they weren't even able to
make the 4K*1 work, and the only production tubes were 256*1.
On Thu, Jan 6, 2022, 01:20 Joshua Rice via cctech
wrote:
>
> Not cost effective at nearly $10,000! I understand they're very rare,
> given they were only used for a few years in industry and they're
> clocking on 3/4 of a century old, but even then, that seems an order of
> magnitude or two off t
I wrote a new monitor ROM for the Z80, called umonz, which can provide some
basic monitor functionality even if there is no working RAM. In other
words, it doesn't use a stack or store any variables in RAM. It supports
reading and writing memory, I/O ports, and loading and dumping Intel hex
format.
On Thu, Apr 28, 2022, 15:03 Peter Cetinski via cctalk
wrote:
>
> TRS-80 guru Ian Mavric sells those gold connectors for the TRS-80.
>
> https://www.ebay.com/itm/164568343523 <
> https://www.ebay.com/itm/164568343523>
>
They're made by Sullins, and may be orderable from Digi-Key and other
distrib
On Thu, May 12, 2022 at 12:25 PM Alexander Huemer via cctalk <
cctalk@classiccmp.org> wrote:
> On Thu, May 12, 2022 at 02:01:50PM -0400, William Sudbrink via cctalk
> wrote:
> > I picked up one of these in a batch of electronics. Is it worth
> > repairing/investigating?
>
> The scope does what it
Those should be fine. Only the more complex parts had issues, not the
simple gates.
On Sun, May 15, 2022, 02:04 Rob Jarratt via cctalk
wrote:
> Oh dear, while I was ordering an original 7474 I ordered some other parts
> that were connected to the same bad chip in case other chips are damaged,
>
On Sat, May 14, 2022, 16:09 ben via cctalk wrote:
> On 2022-05-14 11:50 a.m., Nigel Johnson Ham via cctalk wrote:
> > AFAIR LS can only drive one unit TTL load.
> >> paul
> LS is 4 TTL, 4 ma low.
> Was there a trick of forcing the output of D flip flip
> to clear it? I was wondering if this i
I specifically said 74x74. Early TTL flipflops were very crude by
comparison.
On Sun, May 15, 2022, 13:03 Brent Hilpert via cctalk
wrote:
> On 2022-May-15, at 1:16 AM, Eric Smith via cctalk wrote:
> > On Sat, May 14, 2022, 16:09 ben via cctalk
> wrote:
> >> On 2022-05
On 2022-May-15, at 3:53 PM, Eric Smith wrote:
> I specifically said 74x74. Early TTL flipflops were very crude by
comparison.
On Mon, May 16, 2022 at 11:28 AM Brent Hilpert via cctalk <
cctalk@classiccmp.org> wrote:
> pre-TTL != early TTL
>
No, but 7470, 7472, 7473, and 74948 were _very_ early
On Tue, May 17, 2022 at 12:35 AM ben via cctalk
wrote:
> Did DEC not use a few Non TTL chips to reduce I/O loading on the bufferd
> lines?
>
DEC used non-TTL buffer chips for bus interface (Omnibus, Unibus, Qbus, and
external buses like Massbus). Most of the other SSI/MSI logic chips are TTL
or
I've poked around inside the 5100 some years ago, but most of my
information came from the Maintenance Information Manual, and I only
verified a little of it relating to the executable ROS.
The executable ROS is split between a half card in slot H2, which is
required for all 5100 models, and an AP
On Fri, Sep 2, 2022, 07:51 geneb via cctalk wrote:
> The question I have is how did a contemporary system deal with the
> combination of a disk with both index windows and a drive with both index
> sensors?
>
They didn't deal with it at all. It didn't work. No normal 8-inch floppy
disks have bot
On Fri, Sep 23, 2022, 21:50 Ali via cctalk wrote:
> I always thought the i960 was an upgrade to the i860 (sort of like i386 to
> i486 upgrade). However, based on the info on wiki it seems as if the i960
> actually came first and although a RISC chip it was in no way in the same
> league as the i8
On Wed, Oct 12, 2022, 14:54 Steve Lewis via cctalk
wrote:
> Datapoint 2200 [...] iinstruction set was said to be similar what became
> the
> 8008.
>
The instruction sets weren't similar, they was identical. The Intel 8008
(and TI TMX1795) were designed based on specifications from Computer
Termi
On Thu, Oct 20, 2022, 23:29 George Rachor via cctalk
wrote:
> I remember a bubble memory card being advertise for the Apple ][ but never
> saw one.
>
> Were they ever made?
>
Yes. I have the Helix Labs card.
On Thu, Feb 16, 2023 at 11:28 AM David Schmidt via cctalk <
cctalk@classiccmp.org> wrote:
> Generally, a ProFile driver that is otherwise unspecified will be 5MB
> (i.e. https://apple3.org/iiisoftware.html#drivers ). There is a
> different card (ROM?) as you found out that will matter for 5 vs. 1
On Thu, Feb 23, 2023, 08:44 Will Cooke via cctalk
wrote:
>
>
> > On 02/21/2023 10:48 PM CST Eric Smith via cctalk
> wrote:
>
> >
> > Profile trivia:
> >
> > The firmware _inside_ the Profile is strange in that it doesn't actually
> > KNOW the
On Mon, Mar 27, 2017 at 2:53 PM, Sean Conner via cctalk <
cctalk@classiccmp.org> wrote:
> Some time ago I came across the MC6839 ROM which contains floating point
> routines for the 6809. The documentation that came with it stated:
>
> Written for Motorola by Joel Boney, 1980
>
On Wed, Mar 29, 2017 at 9:24 AM, Systems Glitch via cctalk <
cctalk@classiccmp.org> wrote:
> > Any downsides to resettable polyfuses?
>
> If you hit them hard enough, they'll sometimes permanently open, which is
> desirable anyway but does require rework. I don't remember how they stack
> up speed
On Thu, Mar 30, 2017 at 5:05 PM, Rich Alderson via cctalk <
cctalk@classiccmp.org> wrote:
> and what there are are not
> easily within walking distance of good food (In 'n' Out does not qualify).
>
Them's fightin' words!
On Apr 10, 2017 2:43 PM, "Chuck Guzis via cctalk"
wrote:
> Were there any microprocessor chips that attempted to mimic the
> Burroughs B5000 series and natively execute Algol of any flavor?
Yes, that's what the HP 3000 did (before PA RISC), and they did make
microprocessor implementations of it.
On Mon, Apr 10, 2017 at 3:39 PM, Sean Conner wrote:
> What about C made it difficult for the [Intel iAPX] 432 to run?
>
The iAPX 432 was a capability based architecture; the only kind of pointer
supported by the hardware was an Access Descriptor, which is a pointer to
an object (or a refinemen
On Tue, Apr 11, 2017 at 4:44 AM, David Griffith via cctalk <
cctalk@classiccmp.org> wrote:
> Does anyone remember using xvscan? Does anyone know how to get a hold of
> it anymore?
>
I bought xvscan many years ago from tummy.com, but at some point realized
that I no longer have it. I inquired sev
On Apr 11, 2017 11:29 AM, "Chuck Guzis via cctalk"
wrote:
> This has me wondering about how the 432 people implemented FORTRAN.
Oh, there's a very simple answer to that. They didn't!
Early in the 8800/432 development (which started in 1975), Intel was
developing their own language for it, genera
On Apr 11, 2017 5:29 AM, "E. Groenenberg via cctalk"
wrote:
> Wasn't that not an add-on to 'xv' (xv-3.10a)?
xvscan was based on xv but was sold including xv, with the xvscan price
including the cost of an xv license.
On Wed, Apr 12, 2017 at 9:55 AM, Sean Conner via cctalk <
cctalk@classiccmp.org> wrote:
> Yeah, I'm having a hard time with that too. I mean, pedantically, it
> should be:
>
> #include
> int main(void) { return EXIT_SUCCESS; }
>
> where EXIT_SUCCESS is 0 on every plaform except
Did IBM publish a Program Logic Manual (PLM) for APL\360, APL.SV, or any
other APL language implementation, as they did for e.g. their FORTRAN(E)
and PL/I(F) compilers?
On Tue, Apr 25, 2017 at 8:28 PM, Jim Brain via cctalk wrote:
> Been trying to Google things, but not having a lot of luck. I understand
> both are white case, both have slimline drives, 12 had no card cage, I
> think I read somewhere that the 16 came with 68K std (no Z80?), and 12 had
> KB conn
On Mon, May 1, 2017 at 12:49 PM, Peter Cetinski via cctalk <
cctalk@classiccmp.org> wrote:
> The 8mhz [MC68000 for TRS-80 Model 16/6000] boards are similarly unobtanium
Is a schematic for the 8 MHz board available? Is there any other tech info
about the differences between the original 6 MHz bo
On Fri, May 5, 2017 at 3:02 PM, allison via cctech
wrote:
> In the PDP-10 realm not less than a handful Tops10. ITC, more.
>
TOPS-10 doesn't have any filesystems for floppy disks, though the KL10
front-end PDP-11/40 running RSX-20F does, and there are utilities to access
RSX and RT11 filesystems
Back when the Voice Power board for the 7300/3B1 UnixPC was of mainstream
interest, I spent some time trying to obtain specifications and programming
information regarding the Western Electric DSP20 chip it used. Unlike the
DSP16 and DSP32, WE (and AT&T Microelectronics) did not offer the chip for
On May 19, 2017 10:46 PM, "dwight via cctalk" wrote:
I don't believe the AIM-65 normally does color??
The AIM-65 normally does one color, which is red, on its alphanumeric LED
displays.
Did you get an actual Firefly (research) board, or a prduction VAXstation
3520/3540 board? I don't think you're likely to find schematics or pinouts
for either, but it's not impossible to find 3520/3540 stuff, while I've
never before heard of anyone encountering any actual Firefly boards in the
wil
On May 31, 2017 11:06 AM, "Paul Koning via cctalk"
wrote:
To clarify: Firefly is an internal-only device built by DEC research in
Palo Alto. It wasn't a product and as far as I remember wasn't the basis
of one, either. There are some DEC SRC reports that describe aspects of
the Firefly. I thin
Commodore didn't use any capacitive keyboards on 6502-based computers.
That would have taken extra electronics and cost more.
I don't know whether any of the Amiga keyboards were capacitive, but I
suspect not.
On Tue, Jun 6, 2017 at 3:48 PM, Guy Sotomayor Jr via cctalk <
cctalk@classiccmp.org> wrote:
> Yes, I’ve been dealing with the morons who strip the keyboards off of (now
> rare) IBM 327x terminals,
> cut the connectors off and wire them up to PS/2 or USB. May they burn in
> hell.
>
I have an IBM
On Tue, Jun 13, 2017 at 12:39 AM, Chuck Guzis via cctalk <
cctalk@classiccmp.org> wrote:
> The trimpot on the board says to me that the clock is most likely a
> simple RC affair.
That does seem likely.
>For low bitrates, that's perfectly adequate.
>
A person might think so, but as DEC fou
On Tue, Jun 13, 2017 at 5:53 PM, Chuck Guzis via cctalk <
cctalk@classiccmp.org> wrote:
> The TR1602 UART, like its cousin, the AY-3-1013 used in the TVT,
> tolerates a pretty wide range of bit rate distortion. The app note
> gives a figure of something like 49%. And, since it's async, the game
On Tue, Jun 13, 2017 at 6:59 PM, Chuck Guzis via cctalk <
cctalk@classiccmp.org> wrote:
> Well, I didn't say "timing error", I did say "timing distortion", which
> is not quite the same thing. My reference was the "TR1602/TR1863/TR1865
> MOS/LSI Application Notes Asynchronous Receiver Transmitter"
It's actually a legit measurement, but it's basically how much total jitter
+ bit-proportioned rate error the rx signal can have as a percentage of bit
time, and doesn't matter nearly as much when receiving from all-electronic
transmitters, vs mechanical such as TTY.
I'm sure it made the marketing
On Wed, Jun 14, 2017 at 6:14 PM, jim stephens via cctalk <
cctalk@classiccmp.org> wrote:
> FWIW the send and receive clocks are separate on the 1602 Uart.
>
That is true of all traditional UARTs. For fancier parts intended for
direct connection to microprocessor buses , some have separate clocks
My VT180 is missing the "Z" keycap. Does anyone happen to have VT100-series
keycaps to spare? (Or an entire keyboard to sell?)
Best regards,
Eric
On Mon, Jul 10, 2017 at 1:13 PM, Robert via cctalk
wrote:
> I've recently picked up a 5110 (BASIC only), along with a 5114 floppy
>
...
> t powers on, completes its self test and gets to LOAD0, but several
> of the characters are only partially drawn on the screen. The lower
>
...
> 1. Can anyb
On Mon, Jul 10, 2017 at 3:38 PM, Rob Jarratt via cctalk <
cctalk@classiccmp.org> wrote:
> Do you have any videos (with sound!) of the LP20 operating?
>
The LP20 is just the printer interface. It looks exactly the same whether
it's operating or not, and doesn't make any sound unless something is v
On Wed, Jul 12, 2017 at 8:38 PM, Robert via cctalk
wrote:
> Side note: It's probably not a good time to try out my shiny new heat
> gun that I've never yet used. Maybe save my first go on it for
> something more replaceable.
>
A heat gun is definitely NOT the right tool for desoldering through-h
On Thu, Jul 13, 2017 at 10:42 AM, William Sudbrink via cctalk <
cctalk@classiccmp.org> wrote:
> If you have the bucks, go for a Pace station with an SX-100 desoldering
> tool. 40 pin chips
> fall out like they were never soldered in the first place.
>
That's my experience with the Hakko 472D-01.
On Fri, Jul 14, 2017 at 8:59 PM, jim stephens via cctalk <
cctalk@classiccmp.org> wrote:
> Backwater == St. Louis, BTW, a place I visit pretty often.
>
> Still my all time favorite, Stu's Gateway Electronics still going.
>
I really miss the Gateway Electronics location in Denver, closed 15 years
On Jul 16, 2017 4:10 PM, "Robert via cctalk" wrote:
Does anybody know
whether upgrading the memory is as simple as plugging in another
board, or does it involve wiring changes to the backplane, or other
complex manoevres?
Just plug in the memory cards.
I'm interested in the history of the logic design for the edge-triggered D
flip-flop, as used in the SN7474. The design is composed of three set-reset
latches (six NAND gates total) per flip-flop.
Does anyone know what year the SN7474 was introduced, or have an early
datasheet for it (prior to the
Thanks for all the info, Brent!
The MECL II MC1022 is an edge-triggered D flip-flop using master-slave
design. I'll have to look up the others you mentioned, especially the
National DM8510 and Sprague NE8828.
I've previously overlooked the MC778 mW RTL D flip-flop, which also uses a
variant of t
On Wed, Jul 19, 2017 at 11:29 PM, Ethan Dicks wrote:
> I have no datasheet, but I have examples on DEC M-series FLIP-CHIP
> modules from my PDP-8/L, c. 1968.
>
> I am pretty sure I have examples with 1968 date codes and possibly
> 1967 date codes.
>
Thanks! Also, the 1967 Allied catalog lists th
On Jul 19, 2017 10:43 AM, "Douglas Taylor via cctalk"
wrote:
The pdp11_fp.c code is quite intricate. If simh was a simple simulation it
would take the easy route and use the intel fp co-processor as you point
out, but it doesn't. It actually 'emulates' what the pdp11 would do in
hardware.
Do
On Jul 19, 2017 10:15 AM, "Fred Cisin via cctalk"
wrote:
> That Steve Jobs was pestering them for a cheap drive, but due to the
holes in his jeans and personal hygiene?, they never took him seriously.
I think Shugart settled on 5.25" for the size of a minifloppy at least a
year, and more likely t
On Fri, Jul 28, 2017 at 5:16 PM, David Griffith via cctalk <
cctalk@classiccmp.org> wrote:
>
> I'm trying to verify the correct dimensions for a 160mm x 100mm EuroCard.
> I figured this would be simple: 160 millimeters by 100 millimeters. But
> when I submitted a template to the Kicad project at
On Mon, Jul 31, 2017 at 6:15 PM, Michael Thompson via cctech <
cct...@classiccmp.org> wrote:
> The RICM has an opportunity to get a PDP-8/M (built in Maynard, MA) that is
> in Canada. I remember that there was a discussion on the procedure here,
> but I can't find it with Google.
>
If it is actua
On Tue, Aug 1, 2017 at 6:21 PM, Charles Dickman via cctalk <
cctalk@classiccmp.org> wrote:
> Are RX02 disks actually special or will any SSDD 8in floppy work?
TL;DR: No. As standard 8-inch floppy disks go, only SSSD are useful in an
RX02 drive, even for double-density use (DEC RX02 modified MFM
On Wed, Aug 2, 2017 at 7:24 PM, systems_glitch via cctalk <
cctalk@classiccmp.org> wrote:
> You might consider just adding another storage controller. I'd recommend
> something that talks MSCP. SCSI seems to be what most people are after
> nowadays, but ESDI controllers are much cheaper, and the d
Al just put the TI Silent 700 Model 763/765 maintenance manual up on
Bitsavers. (Thanks Al!)
The 763 and 765 are the models using internal bubble memory for between
10,000 and 80,000 characters of local storage. They use either one or two
"discrete memory boards", with one 92 Kbit bubble device e
On Aug 5, 2017 19:42, "Chuck Guzis via cctalk"
wrote:
My recollection is that the track data was printed by Intel. At least
mine came that way.
Both Intel and TI printed the bad loop map/mask on the device label. Intel
also programmed the map into a special "boot loop" in the device; TI did
n
On Aug 6, 2017 08:20, "dwight via cctalk" wrote:
I wonder if they can be reset by just removing the bias magnets.
The bias field is needed to maintain the domains in the material.
With the Intel bubble parts, if they get erased, you have to use special
electronics and procedure to recreate the
On Aug 6, 2017 12:44 PM, "Sam O'nella via cctalk"
wrote:
Theyre always out of my reach but is there a way to upgrade or convert
5100/5110s to IPL or basic or are you stuck with what you get?
I assume you meant APL.
In general you're stuck with what you get.
In principle if you found all of th
See also "Pay for the Printer" by Philip
See also "Pay for the Printer" by Philip K. Dick, 1956.
On Mon, Sep 11, 2017 at 7:43 PM, Charles Dickman via cctalk <
cctalk@classiccmp.org> wrote:
> On Mon, Sep 11, 2017 at 1:15 PM, Shoppa, Tim via cctalk
> wrote:
> > He seems to have been the first to mention ARPANET in a popular
> hobbyist-type context like BYTE. (Leading him to get kicked off ARPA
On Sep 22, 2017 11:47 PM, "Curious Marc via cctalk"
wrote:
I didn't know you could interface a 9845 with a 7970 tape drive.
The 9845 was the top-of-the-line workstation. It could be interfaced to
almost everything computer-controlable that HP made.
On Oct 6, 2017 12:42, "ben via cctalk" wrote:
On 10/05/2017 03:46 PM, Chuck Guzis via cctalk wrote:
>
>>
>>
>> I recall an Intel engineer opining on the subject. "We give you a
>> 32-bit advanced architecture CPU and you p*ss it away running DOS."
>>
>> Compatibility is a tough mistress.
>>
>> -
On Sun, Oct 8, 2017 at 10:19 AM, Zane Healy via cctalk <
cctalk@classiccmp.org> wrote:
> Did DEC make any sort of impact printer, besides dot-matrix printers? I
> have an LA50 or two, and dot-matrix isn’t what I’m after.
>
They sold some drum, chain, and band printers, but I think they were all
On Tue, Oct 10, 2017 at 6:07 AM, Rod Smallwood via cctalk <
cctalk@classiccmp.org> wrote:
> I have in my possession a back plane from a BA23.
> Somebody has put glue in the last three slots.
> Can anybody explain that?
DEC sold a lower-priced, limited expansion MicroVAX II/RC, and rather than
ac
On Oct 11, 2017 07:35, "Shoppa, Tim via cctalk"
wrote:
The AMD chips probably have two layers of legs.
I doubt it, but without a close-up at a different angle it's hard to say.
Are the AMD chips the memory, and the 54F the glue logic?
I suspect so.
Maybe backtranslating to a core memory bu
IBM invented computer emulation and introduced it with System/360 in 1964.
They defined it as using special-purpose hardware and/or microcode on a
computer to simulate a different computer.
Anything you run on your x86 (or ARM, MIPS, SPARC, Alpha, etc) does not
meet that definition, and is a simul
On Oct 29, 2017 09:54, "Dave Wade via cctalk" wrote:
I am not sure they invented computer emulation. I think that the concept
Emulation/Simulation is as old as, or perhaps even older than computing.
Whilst it was a pure concept Alan Turing's "Universal Turing Machine" was a
Turing machine that co
>From the Otrona Attache Technical Manual, July 1983:
"The diskettes Attache uses have fourty-six tracks on the top side and
fifty tracks on the bottom side, [...]"
Really???
On Fri, Nov 3, 2017 at 6:07 PM, Paul Koning via cctalk <
cctalk@classiccmp.org> wrote:
> Could be. Then again, today's main architectures are all decades old;
> they get refined but not redone.
>
I'm not sure whether you consider the 64-bit ARM architecture to be one of
"today's main architectur
On Mon, Nov 6, 2017 at 9:59 PM, Tony Duell via cctalk wrote:
> Mine identifies the CPU as a 68010 in the power-on diagnostic. But from
> what
> I remember the PGA socket could also take a 68012 (with extra address pins
> brought out). I don't have such a chip, so no idea what it would identify
>
My first FPGA-Elf (2009) used an FPGA board that is long-since obsolete,
and while I updated it last year, it used an FPGA board that was not
commercially available, and would have been frighteningly expensive if it
was. For the most recent RetroChallenge, I updated the FPGA-Elf to work on
a readil
Hi Eric,
It's not urgent, but when you have a chance, could you dump the 9122C
ROM(s) and take high resolution photos of the controller board?
Since it does HD, I suspect it probably does not use a 600 RPM mechanism.
Thanks!
Best regards,
Eric
On Nov 15, 2017 17:45, "Eric Schlaepfer via cctal
On Sat, Nov 18, 2017 at 10:48 PM, Jim Brain via cctalk <
cctalk@classiccmp.org> wrote:
> Looking at the schematic for the ECB, I cannot find any description of the
> signals BAI, BAO, IEI, and IEO. Can anyone shed some light on the function
> of these signals?
>
Bus Acknowledge In and Out, Inter
On Nov 19, 2017 7:18 PM, "allison via cctalk" wrote:
The rest is the specific implementation. What happens if the CPU is
1802 or something else that does not match the 6500 or 8080z80 models.
There is nothing that prevents either the serial or parallel arbitration
schemes from working with oth
On Nov 20, 2017 7:41 AM, "Tapley, Mark via cctalk"
wrote:
Catching up late, sorry if this is an old question, but what did
the Digital Group computers use? My recollection is that they offered cards
with 6800, 6502, 8080, and Z-80 CPUs on the same bus, and that part of the
system seemed t
On Sun, Dec 10, 2017 at 4:19 PM, Noel Chiappa via cctalk <
cctalk@classiccmp.org> wrote:
> Oh, one detail I didn't look at: what's the physical interface this uses?
> Hopefully three of the Berg/DuPont connectors (i.e. what's on the RHxx
> boards, with flat cables going to the adapter to the stand
On Sat, Aug 5, 2023, 08:54 Bill Degnan via cctalk
wrote:
> The Apple I is not historically significant enough alone to justify
> the prices they get
>
The first product sold by the first company to hit $1T market cap seems
historically significant to me.
AFAIK the Apple 1 was also the first ine
On Thu, Aug 17, 2023, 21:27 Chuck Guzis via cctalk
wrote:
> The PACE itself was a re-cast of the NSC IMP-16 chipset.
>
The IMP-16 and PACE architectures were similar (and similar to the DG
Nova), but they weren't binary or source compatible. Apparently NS didn't
think there was enough of an exis
On Thu, Aug 24, 2023, 20:51 Bill Degnan via cctalk
wrote:
> The Jolt was the first 6502, how much is that worth?
>
Did the Jolt predate the KIM-1? I don't know their introduction dates.
On Thu, Nov 23, 2023 at 12:46 AM Sellam Abraham via cctalk <
cctalk@classiccmp.org> wrote:
> The CADC had no program counter: since it was designed from its inception
> to be a multi-processing (multi-threading?) system, it made sense to build
> a program counter onto each ROM. Therefore, when th
I have a new-in-box (but twenty-year-old) HP C8000 workstation (HP
Precision Architecture). The box contains an HP-UX license certificate,
entitling me to copy and install HP-UX 11i v1 (11.11) TCOE (Technical
Computing Operating Environment) for use on the machine. Unfortunately I
don't have 11i v1
On Thu, Jun 20, 2024 at 2:13 AM Adrian Godwin via cctalk <
cctalk@classiccmp.org> wrote:
> I'm interested in this. I'm looking at the bottom end, the bus and cards,
> but there may be information we can share.
>
That's where I'm starting, too. I'm using a 16500A (rather than a B, C, or
1670x) bec
Pn Thu, Jun 13, 2024 at 11:57 AM Paul Koning via cctalk <
cctalk@classiccmp.org> wrote:
> MIPS, perhaps? It has "delay slots".
MIPS has delay slots for branches (two for Standord MIPS, one for
commercial MIPS), but no delay slots for ALU operations. All MIPS
implementations either interlocked t
On Thu, Jun 13, 2024 at 10:15 AM CAREY SCHUG via cctalk <
cctalk@classiccmp.org> wrote:
> I think I recall an early processor that did out of order execution,
> without checking, meaning you could have
>
> add xxx to accumulator
> store accumulator in zzz
>
The Intel i860 (unrelated to x86, i960,
On Tue, Jun 25, 2024, 22:33 Robert Johnson via cctalk
wrote:
> I’m all but certain that the 16500 series is a 68k not PA-RISC though.
>
Yes. It is the 16700 series that uses a PA7300LC CPU.
Nevertheless, for reverse-engineering the module interface, working with a
16500 will be easier.
On Sat, Jul 20, 2024 at 8:08 PM Steve Lewis via cctalk <
cctalk@classiccmp.org> wrote:
> What I meant was that in the title of the book they use "digital computer"
> and I wonder if there was ever a book describing a mechanical "analog
> computer" - and what they might even look like.
>
I haven't
On Sat, Nov 10, 2018 at 8:55 AM Jim Manley via cctalk
wrote:
> It's one thing to replace discrete transistors in our IBM
> 1401, but, it's quite another to desolder and yank various little black
> rectangles off extremely dense circuit boards without destroying anything
> else ... and then solder
On Tue, Nov 13, 2018 at 1:47 PM Ethan Dicks via cctalk <
cctalk@classiccmp.org> wrote:
> On Sat, Nov 24, 2012 at 4:08 AM Eric Smith wrote:
> > I spent some time reverse-engineering the firmware. There is only one
> > undocumented opcode, decimal 10, and I haven't yet figured out what it
> > does
Mark J. Blair (NF6X) has a git repo with various TU58 firmware
disassemblies here:
https://gitlab.com/NF6X_Retrocomputing/tu58firmware
On Wed, Nov 14, 2018 at 8:53 AM Ethan Dicks via cctalk <
cctalk@classiccmp.org> wrote:
> On Sat, Nov 24, 2012 at 4:08 AM Eric Smith wrote:
> > I spent some time reverse-engineering the firmware. There is only one
> > undocumented opcode, decimal 10, and I haven't yet figured out what it
> > does
On Mon, Nov 19, 2018 at 2:24 PM Sean Conner via cctalk <
cctalk@classiccmp.org> wrote:
> I've always been amused by IEFBR14 ever since I heard about it. I first
> came across it by this quote:
> Every program has at least one bug and can be shortened by at least
> one instruction-
On Wed, Nov 28, 2018 at 1:55 PM Fred Cisin via cctalk
wrote:
> In the late 1970's in the TRS80 world, there were MALE 34 pin card edge
> ribbon cable connectors! with gold plated fingers! (used on a short
> extension for drives in enclosures, and to convert expansion interface
> connections to g
On Wed, Nov 28, 2018 at 7:05 PM Chuck Guzis via cctalk <
cctalk@classiccmp.org> wrote:
> > 2) is there some way to specify "hardened" or whatever plating for the
> connector traces?
> My last order from OSHPark came with all traces gold-plated.
> Apparently, it's getting to be standard practice.
>
On Wed, Nov 28, 2018 at 6:01 PM William Sudbrink via cctalk <
cctalk@classiccmp.org> wrote:
> 1) how do you specify the slightly beveled edge required for easy
> insertion?
>
2) is there some way to specify "hardened" or whatever plating for the
> connector traces?
>
Those have to be specified "o
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