1 Nov
1998
1 Nov
'98
4:55 a.m.
< I know about that. A ROM-based debugger would be helpful if I don't
< have a bootable system.
helpful with what? Even a rom based debugger presumes there are some
system resources that work. For a PC that would mean keyboard, video,
some ram and of course the rom plus some of the glue hardware. In
reality the only thin not working at that point is the floppy/hard disks.
Also most debug monitors are minimalistic and assumptions are you have
sources for what your debugging and prints if hardware. For a PC that
is not likely.
For a PDP-11 and most of the systems I listed before that is likely or at
least so to the module level. Different systems concept.
Allison
1 Nov
1 Nov
4:32 a.m.
< I know about that. A ROM-based debugger would be
helpful if I don't
< have a bootable system.
helpful with what? Even a rom based debugger presumes there are some
system resources that work. For a PC that would mean keyboard, video,
I think he means ROM Monitor, from personal experience I know it's nice to
have a ROM monitor that you can drop into and exercise the Hardware if you
don't have any boot media.
Then again, why that would be helpful on a PC where you can get DOS without
even trying, I don't know why it would be helpful.
Zane
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+----------------------------------+----------------------------+
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7:18 a.m.
On Sun, 1 Nov 1998, Allison J Parent wrote:
< I know about that. A ROM-based debugger would be
helpful if I don't
< have a bootable system.
helpful with what? Even a rom based debugger presumes there are some
system resources that work.
Well, not to put too fine a line on it, all modern PC's have a built-in
debugger. The Pentium has a built-in debug mode and brings the debug port
out on the pins. I don't know of any PC maker that includes a debug port
on the machine though. Check out products from Arium Corp (www.arium.com)
for cool tools that use this capability.
-- Doug
11:11 a.m.
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12:53 p.m.
Thats right, and from the description of the prompt commands you gave me
and a short procomm script I can boot the 11/44 with what ever I want.
The cross development tools need some work though.
If you don't get peek, poke and jump the next step is a rom emulator or
burning your own roms. Both of which have drawbacks.
-- Mitch
One trivial advantage of having a monitor (and not just a disk bootstrap)
in ROM for classic computers is that even if the boot disk is lost, and
there's no chance of getting another, there's still a way to make the
machine do _something_.
-tony
1:18 p.m.
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2:14 p.m.
Absolutely, I can't imagine doing this on an 11/44 with out the
documentation. I did this very thing with a bunch of corvus concept
boards about 10 years ago. Decoded (coded ?) the 68k peripheral chip CS
lines with a latch, the 68k will loop through its address space it you
ground DTACK.
Brings up another topic: Anybody got a Corvus Concept?
--Mitch
Tony Duell wrote:
If you don't get peek, poke and jump the
next step is a rom emulator or
burning your own roms. Both of which have drawbacks.
Yes, but you need to know a _lot_ more about the hardware to think of
replacing the boot ROMs than you need to simply write a little program to
run under a ROM monitor.
-tony
9548
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6 comments
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allisonp＠world.std.com -
ard＠p850ug1.demon.co.uk -
healyzh＠ix.netcom.com -
mew_jac＠swbell.net -
yowza＠yowza.com