Floating point math in FORTRAN IV on PDP-8

[Kyle Owen]

On Wed, Sep 19, 2018, 19:46 Michael Zahorik <m.zahorik at sbcglobal.net> 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
>

Since you're running SerialDisk...did you disable the SerialDisk interrupt,
or are you running a new enough version to do so?

If FRTS hangs when executing, that would be one possible explanation. FRTS
is only smart enough to check the interrupts it knows about; the aux TTY
interrupt is apparently not handled.

Thanks!

Kyle