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From: Howard Harte <hhar...@yahoo.com>
Newsgroups: comp.os.cpm
Subject: Re: SCP 86-Dos files available
Date: Mon, 26 May 2008 09:22:30 -0700 (PDT)
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On May 16, 8:41=A0am, Howard Harte <hhar...@yahoo.com> wrote:
> On May 16, 3:53=A0am, "Robert J. Stevens" <ztreb...@execpc.com> wrote:
>
>
>
> > glen herrmannsfeldt wrote:
> > > (someone wrote)
> > >>> in Internet explorer, right click on the filename and "save target a=
s"
> > > Robert J. Stevens wrote:
>
> > >> I was using Firefox and it didn't give me that option
>
> > > It seems to be "save link as" in Firefox, but it does the same thing.
> > > The other choice, "copy link location," copies the link to the
> > > clipboard, such that you can paste it somewhere.
> > > One place is to a command window with a wget command.
>
> > I got the Mon.Asm Assembled using the ASM.Com and ran Hex2Bin; but how
> > do I get it to run
> > On what Machine will it run
> > Also can that code be put on an EPROM.
> > I might be able to get it over to my NEC APC and try MS-DOS 2.0
> > I can put it on a 5.25 then copy to a 8" SSSD CP/M format floppy then
> > MS-DOS 2.0 on the NEC will copy from the CP/M floppy to the Dos Floppy
> > using RDCPM.
> > Too Bad there isn't a reverse program that will copy a File from the NEC=

> > DOS back to a SSSD CP/M 8" floppy.
> > Is there anyone who might be able to reverse engineer RDCPM if I can get=

> > it back to CP/M
> > I should be able to de-assemble using DEBUG. I'm a Newbie there put
> > Practice makes Perfect.
> > I have an image copy on the NEC of the 8" SSSD SCP 86-DOS V1.0
> > I used DEBUG to read in the 8" and saved to a file. its about 132000 byt=
es.
> > I put it on a DOS formatted SSSD 8" but at this point can't read it
> > anywhere else except on the NEC.
> > If I get my COMPATICARD PC Running then I should be able to read 8" SSSD=

> > Floppies
> > TIA
> > Bob
>
> Hello Bob,
>
> The monitor is 2k, so you can burn it into a 2716 or larger EPROM. The
> reset vector for the 8086 is at FFFF0h, and that is the entry point
> into the monitor, so if you are using a 2716, you would set the ROM
> base address to FF800h.
>
> It should work with any 8086 CPU board provided that the board, but if
> it's a dual CPU board like the CompuPro, then it would have to be
> configured to start with the 8086 active.
>
> The monitor expects a SCP300E support board for the I/O, but it really
> only uses the UART at F6-F7h, and it checks a "sense switch" at FFh to
> determine whether to enter the monitor or jump directly to the disk
> bootstrap.
>
> If there is no I/O port at FFh, then the CPU will most likely read FFh
> from the floating data bus and jump to the disk bootstrap.
>
> Probably the easiest thing to do is modify the monitor for your own
> UART, and skip the sense switch check.

sIMH/AltairZ80 is running the SCP 8086 monitor fine now.  There was a
bug in the 8086 simulation with the segment override prefix
instructions with interrupts enabled, that I fixed.  I also added a
Cromemco 4/16/64FDC to the simulator, complete with the RDOS monitor.
It can run Cromemco CDOS and CP/M from simulated 8" or 5" floppies, so
I belieeve SIMH is ready to boot 86DOS when we recover the disk image.