I've used PDP11GUI for various things, as well as the TU58, so I will give that a try. Thanks. Rich -- Rich Cini http://www.classiccmp.org/cini http://www.classiccmp.org/altair32 On 9/10/20, 1:16 PM, "vcf-midatlantic on behalf of Bill Degnan via vcf-midatlantic" <vcf-midatlantic-bounces@lists.vcfed.org on behalf of vcf-midatlantic@lists.vcfed.org> wrote: Sorry I forgot my web page notes: https://www.vintagecomputer.net/browse_thread.cfm?id=668 Let me know how it goes. b On Thu, Sep 10, 2020 at 1:13 PM Bill Degnan <billdegnan@gmail.com> wrote: > PDP11GUI allows you to create bootable media by simulating tape storage > via PC rs232 port. What I did was use simH to create the boot disk I > wanted, tested to make sure it worked and then used PDP11GUI to dump the > image onto an awaiting RL02 disk. You can do the same with RK05 and I > presume RX01/2 as well. > Bill > > On Thu, Sep 10, 2020 at 12:25 PM Herb Johnson via vcf-midatlantic < > vcf-midatlantic@lists.vcfed.org> wrote: > >> > No RT-11 disk image I’ve used will boot, >> > I was hoping someone could point me to a listing of what the on-disk >> boot block code on an RT-11 floppy might look like. >> >> Rich, I don't understand your problem. If you have access to RT-11 disk >> images on the Web, my guess is some of them are "bootable". By >> "bootable" that means by your account, they have PDP11 boot code on >> their first sector. If they have boot code on their first sector - then >> extract the first sector and *hand disassemble the binary*. Then you >> know what that code quote "looks like". >> >> 256 words (512 bytes) is just a handful of disassembly work - hardly >> worth bothering to run an emulator to run some debugger to produce some >> PDP-11 code. and you seem so deep into this custom emulator and the >> LSI-11 architecture, that you seem to know what you'd need to make sense >> of the boot code. I'm familiar with PDP-11's a little, it's not >> horrendous binary code. >> >> YOu also say, this emulator apparently needs a custom RT-11, presumably >> with custom boot code. But the creator doesn't recall the details. Well, >> 24 years is a long time to remember such things. That being the case, >> you will have to figure out the boot process anyway. You already have to >> dig into the emulator. And you seem to know the hardware. Thus doing the >> hand disassembly will be, er, "informative". >> >> What am I missing here? Do you need some known bootable RT-11 diskettes, >> so you can put one in some drive and read off the boot sector? Or >> someone to send you that binary or disk image? >> >> Likewise: >> >> > It’s like looking for a disassembly of the MS-DOS boot sector. >> >> (snort) MS-DOS DEBUG will do that, with a IBM PC tech manual in hand. >> >> I don't mean to belabor the point, but maybe this is as I suspect: a >> desire to avoid hand-disassembly. If that's a personal issue, my >> apologies, but I think it's a very useful skill. And if it's not a >> desirable task, well, there's usually debuggers which do that, or one >> can cobble up a disassembler in one's favorite language (or borrow one >> and rework it). I've done all those things, and still do, but that's >> just me. >> >> Puzzled, Herb >> >> -- >> Herbert R. Johnson, New Jersey in the USA >> http://www.retrotechnology.com OR .net >> preserve, recover, restore 1970's computing >> email: hjohnson AT retrotechnology DOT com >> or try later herbjohnson AT retrotechnology DOT info >> >