[TUHS] can someone help about the pdp11/34 boot ? :(

[TUHS] can someone help about the pdp11/34 boot ? :(

[asbesto]

Hi,

is anyone here that can help us booting the pdp11/34 ? :(

we're becoming mad :(((

the boot loader hangs at 001012. can someone help understand
why? 

we haven't any bus error, and we have no prompt at serial
terminal pressing "ctrl-boot"

this is the boot code, found in "E-10 Loading Software Bootstrap":

location	contents
001000		012701
001002		174400
001004		012761
001006		000013
001010		000004
001012		012711
001014		000004
001016		105711
001020		100376
001022		005061
001024		000002
001026		005061
001030		000004
001032		012761
001034		177400
001036		000006
001040		012711
001042		000014
001044		105711
001046		100376
001050		005007

starting it, the display show "1012", i think this mean that 
he stop at address 001012. why? 

please someone help, we're here trying to boot it.

also, some test code and how-to test is appreciated :)

-- 
[ asbesto : IW9HGS : freaknet medialab : radiocybernet : poetry ]
[ http://freaknet.org/asbesto http://papuasia.org/radiocybernet ]
[ http://www.emergelab.org :: NON SCRIVERMI USANDO LE ACCENTATE ]
[ *I DELETE* EMAIL > 100K, ATTACHMENTS, HTML, M$-WORD DOC, SPAM ]

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[TUHS] can someone help about the pdp11/34 boot ? :(

[Carl Lowenstein]

On 8/30/05, asbesto <asbesto at freaknet.org> wrote:
> 
> 
> Hi,
> 
> is anyone here that can help us booting the pdp11/34 ? :
> 
> the boot loader hangs at 001012. can someone help understand
> why?
> 
> we haven't any bus error, and we have no prompt at serial
> terminal pressing "ctrl-boot"
> 
> this is the boot code, found in "E-10 Loading Software Bootstrap":
> 
> location contents pseudo-source code
> 001000 012701 mov #174400, r1
> 001002 174400
> 001004 012761 mov #13, 4(r1)
> 001006 000013
> 001010 000004
> 001012 012711 mov #4, @r1
> 001014 000004
> 001016 105711 tstb @r1
> 001020 100376 bpl .-2
> 001022 005061 clr 2(r1)
> 001024 000002
> 001026 005061 clr 4(r1)
> 001030 000004
> 001032 012761 mov #-400, 6(r1)
> 001034 177400
> 001036 000006
> 001040 012711 mov #14, @r1
> 001042 000014
> 001044 105711 tstb @r1
> 001046 100376 bpl .-2
> 001050 005007 clr pc
> 
> starting it, the display show "1012", i think this mean that
> he stop at address 001012. why?


The display shows the next address to be executed. When the processor halts, 
what are the
actual contents of locations 1000-1010? Are they what you keyed in, or has 
this memory been
over-written? 

This looks like code for a RL01/RL02.
Is the bus address of its control registers the normal 174400 - 177406?

If you replace the last instruction CLR PC (5007) with HLT (0000) does the 
processor
get there? This should happen regardless of what is read from the disk, 
because the
code from the disk is not executed.

You can find a lot of small key-in test programs at
< http://www.dunnington.u-net.com/public/ODT/SourceCode/ >

carl
-- 
carl lowenstein marine physical lab u.c. san diego
clowenst at ucsd.edu
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