in the procedure derecv

if ((rp->r_flags & (RFLG_ERRS|RFLG_FRAM|RFLG_OFLO|RFLG_CRC))||

(rp->r_flags&(RFLG_STP|RFLG_ENP)) != (RFLG_STP|RFLG_ENP) ||

(rp->r_lenerr & (RERR_BUFL|RERR_UBTO|RERR_NCHN)) ||

len < ETHERMIN || len > ETHERMTU) {

something here is being passed wrong.. I've just changed the statement to if(1==2) to keep the logic flow...

Anyways the same issue cropped up with 4.2 BSD & the VAX 11/780

On my pdp-11 the ini I'm using is:

set cpu 11/94 4M

set cpu cis

set cpu idle

set xu ena

att xu slirp

;attach tm0 211bsd.tap

attach tm0 ircii-4.4.source.tap

set rp0 rp06

attach rp0 auto.dsk

set rq dis

set rk dis

set rl dis

set hk dis

set rx dis

set tq dis

set dz lines=8

att dz 1000

boot rp0

I'm also using a version of SIMH that I've replaced the libpcap with SLiRP from Qemu.. It's basically a user mode ip stack to do NAT. The advantage is that they always have the same ip address, and it doesn't require escalated privileges to run.

On Wed, Aug 11, 2010 at 5:45 AM, Johnny Billquist <bqt@softjar.se> wrote:

Jason Stevens <neozeed@gmail.com> wrote:

I managed to get 2.11 installed on SIMH, and hacked the de driver to work
(pretty much the same thing I did for 4.2 BSD on the 11/780) and now I've
gotten it networking.

Huh? What did you hack with the qe driver? Was that in 2.11BSD? I didn't know there was any problems with it in the first place.

Or is there some problem in simh that you fixed?

I'll admit I'm not all that swift on the pdp-11, but I get the impression

that the maximum exe size is 128kb with 64kb of instructions, and 64kb of
data? Isn't there something that can be done with overlays or some other
linker thing to act like an 8086/80286 with the large memory model (ie
multiple segments...?)

Yes and no. In principle, the maximum size of a program is 64K instruction and 64K data. That's as much as is directly addressable. With overloays you can extend that somewhat, but there are limitations and restrictions.

I've been trying to build ircII-4.4 and I can't figure out how to link
something that big... I've tried the -Z and -O flags to ld to no avail.

Clearly I'm doing either something wrong, or impossible or stupid.

FWIW, here is the size of the same program on the VAX

myname# ls -l irc-4.4
-rwxr-xr-x 1 root 413696 Jun 8 08:46 irc-4.4*
myname# size irc-4.4
text data bss dec hex
293888 67584 20784 382256 5d530

I have a feeling that 300kb of text, along with 67kb of data is just too
much...?

Any pointers would be appreciated!

You'll need to trim some fat off.

Points to remember:
64K data is the max. There is no way to use overlays to get more data space. Overlays can only extend the instruction space.
Overlays and the main program share the same address space. That is, the size of the main code and the largest overlay segment together must not exceed 64K. So, overlays is just a way to move parts of the program in and out of your basic 64K address space.
When you link a program, you'll be able to see the sizes of all segments as well as the main program.

As an example, this is how tcsh looks like:

Test:/# size /bin/tcsh

text data bss dec hex
48960 14844 11986 75790 1280e total text: 140864
overlays: 15424,16000,14144,14016,16256,16064

Notice how text+max(sizeof overlays) is less than 64K.

All that said, you can easily find IRC clients who are much smaller than that... :-)

Johnny

--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt@softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol