Re: IDE Hard Drive Question
You'll look for pins on the board to instruct the drives which will be reading and which will be writing. That is my guess. Both need to work and have empty space. Probably the machine booted directly from some type of PXE, but maybe not. This gives you a hint: https://w2hx.com/x/SAIC%20V2LC/20200124_094105.jpg It must power up, that is a good sign. Good luck. On Thu, Jun 25, 2020 at 4:13 PM Jon Elson via cctech wrote: > On 06/25/2020 05:29 PM, W2HX via cctech wrote: > > Does ANYONE have any idea what these 4 wires are connected to and why? > And anyone give any odds about whether these 4 wires will prevent this > IDE-SD converter from working? > > > > > Temperature sensor and heater. Undoubtedly for start-up in > extreme cold conditions. > > Jon >
XMP Simulator
I have been playing with a simulated Cray downloaded from modularcicuits.com... The Simpson's behavior is always odd. Reproducing anything at all is difficult.Would anyone have information about XMT , ampex, CONC or loading DK tapes? I have read one Cray manual already and half of a second. I contacted the creator of the simulator about simulating the chilled connection, I do not know if this is implemented. Any suggestions or ideas are welcome.I I am presently stuck at: MOS TEST COMPLETE IOP-0 HALF 104 IOP STOP IN MERNEL Jonathan Engwall
Re: Floating point math in FORTRAN IV on PDP-8
Maybe you don't want to fix your program.
On September 19, 2018, at 5:46 PM, Michael Zahorik via cctalk
wrote:
Kyle, I have not run my machine since March. Summer is car season. But I
thought that maybe I could run this little program quickly. My PDP8E started
up, loaded the RIM and SERIAL DISK then OS/8 ran. Everything looked good,
BUT.. something is wrong with my FORTRAN 4. Programs seem to compile, but I
can't even run a simple test program that prints out whatever I enter from the
TTY. Something has gone south. Anyway, I'm not familiar with the command
FLOAT(). Do I have to have floating point hardware to use this? Well either
there is something wrong with my machine or more likely with my FORTRAN
software or even more likely operator error (me). So many times after a long
summer I have to re learn most of what I learned last winter. Kinda of like
when I was in school after summer vacation. Mike Zahorik (414) 254-6768
From: Kyle Owen via cctalk
To: General Discussion: On-Topic and Off-Topic Posts
Sent: Wednesday, September 19, 2018 5:43 PM
Subject: Floating point math in FORTRAN IV on PDP-8
At VCF MW this past weekend, I was playing around with an FPP8/A stuffed
into a PDP-8/M with a fan removed. This hex-wide two-board set will happily
work in a quad-wide backplane, as it needs no signals that an 8/A would
otherwise provide.
I wanted to benchmark the FPP8/A with the software emulation that FORTRAN
IV supposedly does. Mind you, I also don't have an EAE in mine, so software
emulation for integer multiplication/division would also be used.
I tried running a simple program to print some natural logs and square
roots, which ran quite well with the FPP8/A in place.
Without the FPP8/A...all of the results were wrong. Significantly. Negative
numbers in many cases. No clear pattern as to what it's doing.
Would anyone be able to try my program on some other real hardware (or
another emulator) to verify? With and without EAE would also be desirable.
I'm not sure how to disable the EAE in SIMH, else I'd try that too.
Here's what SIMH looks like with my program:
PDP-8 simulator V4.0-0 Current git commit id: d35b8725
sim> at rk0 disk2.fortran.rk05
sim> b rk
.TYPE FLOAT.FT
DO 50 I=1,100
F = FLOAT(I)
G = SQRT(F)
H = ALOG(F)
WRITE(4,100) F,G,H
50 CONTINUE
100 FORMAT(' ',F12.6,F12.6,F12.6)
END
.R F4
*FLOAT/G$
1.02 1.02 0.00
2.02 1.414215 0.693147
3.02 1.732053 1.098614
4.02 2.02 1.386296
5.02 2.236070 1.609439
[snip]
98.01 9.899495 4.584968
99.00 9.949874 4.595121
100.23 10.08 4.605171
.
Much appreciated,
Kyle
Re: Floating point math in FORTRAN IV on PDP-8
My SIMH resists anything but Adventure, I am working through a Fortran IV. I
think you break from the loop and confuse the machine using i. That with some
error checking:
.TYPE FLOAT.FT
DO 50 X=1,100
F = FLOAT(X)
G = SQRT(F)
IF (G) (11,11,90)
11 WRITE(4,75) G
75 FORMAT(H 5,ERROR)
90 H = ALOG(F)
WRITE(4,99) F,G,H
99 FORMAT(' ',E12.6,E12.6,E12.6)
50 CONTINUE
WRITE(4,100) F,G,H
100 FORMAT(' ',E12.6,E12.6,E12.6)
END
My for fortran IV book and I are the same age,LoL
Jonathan Engwall
engwalljonathanther...@gmail.com
On September 19, 2018, at 11:10 PM, mark--- via cctalk
wrote:
Hi Kyle
Just out of interest I ran this on VAX Fortran (Compaq Fortran 77 6.6-201) and
I think got the results expected:
$ type for004.dat
1.001.000.00
2.001.4142140.693147
3.001.7320511.098612
4.002.001.386294
5.002.2360681.609438
...
98.009.8994954.584968
99.009.9498744.595120
100.00 10.004.605170
However, I am no Fortran expert!
Regards, Mark.
-Original Message-
From: cctalk On Behalf Of Kyle Owen via cctalk
Sent: Wednesday, September 19, 2018 11:44 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Floating point math in FORTRAN IV on PDP-8
At VCF MW this past weekend, I was playing around with an FPP8/A stuffed into a
PDP-8/M with a fan removed. This hex-wide two-board set will happily work in a
quad-wide backplane, as it needs no signals that an 8/A would otherwise provide.
I wanted to benchmark the FPP8/A with the software emulation that FORTRAN IV
supposedly does. Mind you, I also don't have an EAE in mine, so software
emulation for integer multiplication/division would also be used.
I tried running a simple program to print some natural logs and square roots,
which ran quite well with the FPP8/A in place.
Without the FPP8/A...all of the results were wrong. Significantly. Negative
numbers in many cases. No clear pattern as to what it's doing.
Would anyone be able to try my program on some other real hardware (or another
emulator) to verify? With and without EAE would also be desirable.
I'm not sure how to disable the EAE in SIMH, else I'd try that too.
Here's what SIMH looks like with my program:
PDP-8 simulator V4.0-0 Currentgit commit id: d35b8725
sim> at rk0 disk2.fortran.rk05
sim> b rk
.TYPE FLOAT.FT
DO 50 I=1,100
F = FLOAT(I)
G = SQRT(F)
H = ALOG(F)
WRITE(4,100) F,G,H
50CONTINUE
100 FORMAT(' ',F12.6,F12.6,F12.6)
END
.R F4
*FLOAT/G$
1.021.020.00
2.021.4142150.693147
3.021.7320531.098614
4.022.021.386296
5.022.2360701.609439
[snip]
98.019.8994954.584968
99.009.9498744.595121
100.23 10.084.605171
.
Much appreciated,
Kyle
simh pdp8 question
My pdp8 seems to have very space. I want to try fortran iv. I can't even compile hello world without getting: $SY
