1 Mar
2005
1 Mar
'05
12:29 p.m.
ok, two questions. In at least the docs I have (11/45 service manual, user
manual, and handbook), I can't find a clear description of how to toggle a
program into memory.
I'm assuming that when you enter an address in the front panel switches and
hit "load addrs", that the data lights aren't supposed to automatically show
the data value at that location. I'm assuming you must hit "exam" first. Is
this correct? If not, I'd be autoincrementing and seeing the next data
value. Can someone give me a good example of just how to enter two or three
words starting at a given location? I think I can figure this out, but I'd
rather be sure so I don't skip over something that isn't working correctly.
Second, since it's been over 20 years since I did any MACRO-11 programming,
could someone post a simple few line machine code program I can enter and
run to see if the machine will even go into execute mode correctly. Maybe
something that just adds two constants and stores them in another memory
location.
Once I'm sure the machine is working, you can bet I'll dig back into
MACRO-11. For now, I'm just looking for basic store and run sanity check.
Thanks for any advice/help!
Jay
1 Mar
1 Mar
12:43 p.m.
ok, two questions. In at least the docs I have (11/45
service manual, user
manual, and handbook), I can't find a clear description of how to toggle a
program into memory.
I'm assuming that when you enter an address in the front panel switches
and
hit "load addrs", that the data lights
aren't supposed to automatically
show
the data value at that location. I'm assuming you
must hit "exam" first.
Is
this correct? If not, I'd be autoincrementing and
seeing the next data
value. Can someone give me a good example of just how to enter two or
three
words starting at a given location? I think I can
figure this out, but I'd
rather be sure so I don't skip over something that isn't working
correctly.
Second, since it's been over 20 years since I did any MACRO-11
programming,
could someone post a simple few line machine code
program I can enter and
run to see if the machine will even go into execute mode correctly. Maybe
something that just adds two constants and stores them in another memory
location.
Jay, I am going to post an email that Guy sent me when I was getting my
11/40 up and running. We can call it "PDP-11 program toggling for dummies"
Ashley
1:14 p.m.
Jay, I am
going to post an email that Guy sent me when I was getting my
11/40 up and running. We can call it "PDP-11 program toggling for
dummies"
When it comes to the 11/45, I definitely qualify as a dummy :)
Jay
12:53 p.m.
New subject: 11/45 front panel question, AKA "Program Toggling for Dummies" - LONGish
I apologize for the lengthy nature of this email, but I think it will be
beneficial....
Ashley > Octal Binary (switches on
panel)
Ashley > 000000 000 000 000 000 000 000
Ashley > 000001 000 000 000 000 000 001
Ashley > 000002 000 000 000 000 000 010
Ashley > 000004 000 000 000 000 000 100
Ashley > 000010 000 000 000 000 001 000
Ashley > 000020 000 000 000 000 010 000
Ashley > 000040 000 000 000 000 100 000
Ashley > 000100 000 000 000 001 000 000
Ashley > 000200 000 000 000 010 000 000
Ashley > 000400 000 000 000 100 000 000
Ashley > 001000 000 000 001 000 000 000
Ashley > 002000 000 000 010 000 000 000
Ashley > 004000 000 000 100 000 000 000
Ashley > 010000 000 001 000 000 000 000
Ashley > 020000 000 010 000 000 000 000
Ashley > 040000 000 100 000 000 000 000
Ashley > 100000 001 000 000 000 000 000
Ashley > 200000 010 000 000 000 000 000
Ashley > 400000 100 000 000 000 000 000
Ashley Ashley > Just wanted to spell it out to make
sure I'm speaking your
language.
Ashley > You want me to deposit each one of these values, one at a time, at
Ashley > address 01000, then examine it to make sure it's set to what I told
Ashley > it to set it to. Right? Or should I just start depositing these
at
Ashley > address 001000 and let it deposit each value at consecutive
addresses,
Ashley > then since the examine will also read consecutive addresses (I
think)
Ashley > each time I press the examine switch, it will just read them all
back to
Ashley > me in sequence?
Guy >> First things first. Make sure that
memory works. Try the walking
bit
Guy >> pattern. I'd also check to make sure that *all* of the cards are
seated
Guy >> properly. The jumper between the CPU and the first memory backplane
can
Guy >> come loose easily. Make sure it's in properly.
Guy > Guy >> Once it
appears that you can talk to memory, try loading the
following
Guy >> program:
Guy >> 1000 5000
Guy >> 5200
Guy >> 6100
Guy >> 0005
Guy >> 0775
Guy >> load address 1000 & start. You should see a bit rotate around on the
Guy >> data LEDs.
Ashley > Again, let me spell it out and tell
me if I'm understanding you....
Ashley Ashley > set switch registers to 001000,
press load address.
Ashley > set switch registers to 005000, press deposit (the system will
deposit
Ashley > 005000 at address 001000)
Ashley > set switch registers to 005200, press deposit (the system will
deposit
Ashley > 005200 at the next address)
Ashley > set switch registers to 006100, press deposit
Ashley > etc...
Ashley > After I deposit the 000775, then I set the switch registers to
001000, press
Ashley > load address, then press start.
Ashley > Then I should see the rotating bit.
Ashley Ashley > Correct????
Guy >> Correct.
Jay said:
ok, two questions. In at least the docs I have (11/45 service manual, user
manual, and handbook), I can't find a clear description of how to toggle a
program into memory.
I'm assuming that when you enter an address in the front panel switches
and
hit "load addrs", that the data lights
aren't supposed to automatically
show
the data value at that location. I'm assuming you
must hit "exam" first.
Is
this correct? If not, I'd be autoincrementing and
seeing the next data
value. Can someone give me a good example of just how to enter two or
three
words starting at a given location? I think I can
figure this out, but I'd
rather be sure so I don't skip over something that isn't working
correctly.
-----------------------------------------------------------------------
Jay, here's an excerpt from an email exchange I had with Guy back when
I was getting my 11/40 up and running. This should help you. It helped me.
Guy >> Halt. Load address 01000. Deposit a "walking" one's pattern.
Load
Guy >> address 01000 and examine. Make sure that all the bits are set
Guy >> properly.
Ashley > What's a walking ones pattern?
Guy >> 0, 1, 2, 4, 10, 20, etc. (octal of course).
Ashley > So, using the switch registers...
Ashley 
1:40 p.m.
>>>> "Jay" == Jay West <jwest
at classiccmp.org> writes:
Jay> ok, two questions. In at least the docs I have (11/45 service
Jay> manual, user manual, and handbook), I can't find a clear
Jay> description of how to toggle a program into memory.
Jay> I'm assuming that when you enter an address in the front panel
Jay> switches and hit "load addrs", that the data lights aren't
Jay> supposed to automatically show the data value at that
Jay> location. I'm assuming you must hit "exam" first. Is this
Jay> correct? If not, I'd be autoincrementing and seeing the next
Jay> data value. Can someone give me a good example of just how to
Jay> enter two or three words starting at a given location? I think I
Jay> can figure this out, but I'd rather be sure so I don't skip over
Jay> something that isn't working correctly.
The way it works is this:
- Load address sets the address you're working from
- Exam shows what's in the working address
- Deposit changes the contents at the working address
- If you do exam and exam again, then the second exam increments the
working address first.
- Ditto on deposit and deposit
- However, exam then deposit don't change the working address
So, for example
- load address 1000
- exam exam exam
shows you locations 1000, 1002, 1004, and
- load address 1000
- exam
- deposit 20
looks at location 1000, then changes location 1000 (NOT 1002) to 20.
Jay> Second, since it's been over 20 years since I did any MACRO-11
Jay> programming, could someone post a simple few line machine code
Jay> program I can enter and run to see if the machine will even go
Jay> into execute mode correctly. Maybe something that just adds two
Jay> constants and stores them in another memory location.
Here's a lovely hack -- a one instruction program. Load it at the
last location of your memory. For example, in a machine with 28 kW or
more, load it into 157776. The instruction word is 014747. Deposit
it and start it. If the machine is working right, you'll end up with
014747 in all your memory from 157776 down to zero.
An exercise for the student is why this is so.
paul
4:02 p.m.
ok, two questions. In at least the docs I have (11/45 service manual, user
manual, and handbook), I can't find a clear description of how to toggle a
program into memory.
I'm assuming that when you enter an address in the front panel switches and
hit "load addrs", that the data lights aren't supposed to automatically
show
the data value at that location. I'm assuming you must hit "exam" first. Is
this correct? If not, I'd be autoincrementing and seeing the next data
Yes
value. Can someone give me a good example of just how
to enter two or three
Actually, the 11/45 gets this right (and the appropriate bit of
logic/microcode is not trivial). If you EXAM, then DEP, you'll deposit at
the same location (ditto for DEP, then EXAM). It increments the address
between successive DEPs or EXAMs (but not between a DEP and an EXAM or
vice versa).
The easiest way to think of it (and this is what the machine actually
does) is that it increments the address before each EXAM or DEP in a
sequence of identical operations _apart from the first one_.
words starting at a given location? I think I can
figure this out, but I'd
rather be sure so I don't skip over something that isn't working correctly.
But you don't need to worry about that. Just do this :
Stick the address on the switchs, hit LOAD ADDR
Stick the first word of your program on the switches, hit DEP
Stick the next word on the switches, DEP again
and so on.
-tony
7235
days inactive
7236
days old
6 comments
4 participants
participants (4)
-
ard＠p850ug1.demon.co.uk -
jwest＠classiccmp.org -
pkoning＠equallogic.com -
wacarder＠usit.net