4 Jan
2010
4 Jan
'10
10:46 p.m.
Decided to dust off an old software project -- at one point I was
working on a Tektronix 4051 emulator, a machine based on the Motorola
6800 CPU.
I've coded up a simple 6800 emulation & disassembler but I'm lacking
some simple 6800 code to test out its accuracy on "real" code. I'd like
to put it through its paces on a simple piece of hardware before
tackling the (mostly) undocumented quirks of the 4051. (It's much
easier to debug a hardware emulation when you're confident the CPU
emulation isn't the culprit...)
I thought the Altair 680 would be a good starting point but I can't for
the life of me find any dumps of the monitor/VTL ROMs on the 'net.
Anyone have any leads for these or other 680 software?
Thanks,
Josh
5 Jan
5 Jan
2:38 p.m.
On Mon, 4 Jan 2010, Josh Dersch wrote:
Decided to dust off an old software project -- at one
point I was working on
a Tektronix 4051 emulator, a machine based on the Motorola 6800 CPU.
I've coded up a simple 6800 emulation & disassembler but I'm lacking some
simple 6800 code to test out its accuracy on "real" code. I'd like to put
it
through its paces on a simple piece of hardware before tackling the (mostly)
undocumented quirks of the 4051. (It's much easier to debug a hardware
emulation when you're confident the CPU emulation isn't the culprit...)
I thought the Altair 680 would be a good starting point but I can't for the
life of me find any dumps of the monitor/VTL ROMs on the 'net. Anyone have
any leads for these or other 680 software?
Check out http://www.altairkit.com/
--
David Griffith
dgriffi at cs.csubak.edu
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
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4:08 p.m.
New subject: Looking for Altair 680 monitor ROM image (or other simple 6800software)
Josh Dersch wrote:
Decided to dust off an old software project -- at one point I was
working on a Tektronix 4051 emulator, a machine based on the Motorola
6800 CPU.
I've coded up a simple 6800 emulation & disassembler but I'm lacking
some simple 6800 code to test out its accuracy on "real" code. I'd like
to put it through its paces on a simple piece of hardware before
tackling the (mostly) undocumented quirks of the 4051. (It's much
easier to debug a hardware emulation when you're confident the CPU
emulation isn't the culprit...)
I thought the Altair 680 would be a good starting point but I can't for
the life of me find any dumps of the monitor/VTL ROMs on the 'net.
Anyone have any leads for these or other 680 software?
Thanks,
Josh
You might try the SWTP monitor, a slight variation on the original Motorola
MIKBUG monitor.
The SWTP manual is here:
http://www.opencores.org/websvn,filedetails?repname=System68&path=%2FSy…
The assembler code listing is in the back and appears to have been OCR'd, so it
could be mangled into source
form with a little effort. These monitors use a bit-bashed serial port on bit
lines of a 6820 with an external bit timer read off an input bit on the 6820.
Might be an annoyance to try to emulate but alternatively one could simply hook
into the base-level character read/write routines.
There might be more stuff at Michael Holley's SWTP site but I couldn't access
it a few minutes ago:
http://www.swtpc.com/
(I could send you my own monitor that I use with the 6800 but it's been awhile
since I used it .. also wrote an asm, disasm and simulator a few years ago.)
8:11 p.m.
New subject: Looking for Altair 680 monitor ROM image (or other simple 6800software)
Brent Hilpert wrote:
Josh Dersch wrote:
Cool. I couldn't get to swtpc.com last night either; it appears to be
back now, and it has a dump of MIKBUG as well as the 680b's PROM monitor
& 6800 ALTAIR BASIC, amongst other things... that should give me
something to start with.
Thanks!
Josh
Decided to dust off an old software project -- at
one point I was
working on a Tektronix 4051 emulator, a machine based on the Motorola
6800 CPU.
I've coded up a simple 6800 emulation & disassembler but I'm lacking
some simple 6800 code to test out its accuracy on "real" code. I'd like
to put it through its paces on a simple piece of hardware before
tackling the (mostly) undocumented quirks of the 4051. (It's much
easier to debug a hardware emulation when you're confident the CPU
emulation isn't the culprit...)
I thought the Altair 680 would be a good starting point but I can't for
the life of me find any dumps of the monitor/VTL ROMs on the 'net.
Anyone have any leads for these or other 680 software?
Thanks,
Josh
You might try the SWTP monitor, a slight variation on the original Motorola
MIKBUG monitor.
The SWTP manual is here:
http://www.opencores.org/websvn,filedetails?repname=System68&path=%2FSy…
The assembler code listing is in the back and appears to have been OCR'd, so it
could be mangled into source
form with a little effort. These monitors use a bit-bashed serial port on bit
lines of a 6820 with an external bit timer read off an input bit on the 6820.
Might be an annoyance to try to emulate but alternatively one could simply hook
into the base-level character read/write routines.
There might be more stuff at Michael Holley's SWTP site but I couldn't access
it a few minutes ago:
http://www.swtpc.com/
(I could send you my own monitor that I use with the 6800 but it's been awhile
since I used it .. also wrote an asm, disasm and simulator a few years ago.)
9 Jan
9 Jan
12:13 a.m.
New subject: Looking for Altair 680 monitor ROM image (or other simple 6800software)
Josh Dersch wrote:
Brent Hilpert wrote:
Thanks again for the recommendations; spent a few hours this evening
implementing a very simple Altair 680b simulation (32k ram, monitor ROM,
and a 6850 ACIA) and after fixing three or four silly bugs in my 6800
emulator I can now run MITS BASIC. Seems to be working ok. (I do get a
few odd results from math operations -- 2^13 comes back as 8192.01, for
example. Maybe it's just a BASIC bug :))
Having worked out a few kinks and increased my confidence in the sanity
of my 6800 emulation, it's on to tackle the 4051...
Josh
You might try the SWTP monitor, a slight
variation on the original
Motorola
MIKBUG monitor.
The SWTP manual is here:
http://www.opencores.org/websvn,filedetails?repname=System68&path=%2FSy…
The assembler code listing is in the back and appears to have been
OCR'd, so it
could be mangled into source
form with a little effort. These monitors use a bit-bashed serial
port on bit
lines of a 6820 with an external bit timer read off an input bit on
the 6820.
Might be an annoyance to try to emulate but alternatively one could
simply hook
into the base-level character read/write routines.
There might be more stuff at Michael Holley's SWTP site but I
couldn't access
it a few minutes ago:
http://www.swtpc.com/
(I could send you my own monitor that I use with the 6800 but it's
been awhile
since I used it .. also wrote an asm, disasm and simulator a few
years ago.)
Cool. I couldn't get to swtpc.com last night either; it appears to be
back now, and it has a dump of MIKBUG as well as the 680b's PROM
monitor & 6800 ALTAIR BASIC, amongst other things... that should give
me something to start with.
Thanks!
Josh
5 Jan
5 Jan
4:47 p.m.
On 1/4/10 10:46 PM, Josh Dersch wrote:
Decided to dust off an old software project -- at one
point I was
working on a Tektronix 4051 emulator, a machine based on the Motorola
6800 CPU.
I was just wondering what happened to that
I've coded up a simple 6800 emulation &
disassembler but I'm lacking
some simple 6800 code to test out its accuracy on "real" code. I'd like
to put it through its paces on a simple piece of hardware before
tackling the (mostly) undocumented quirks of the 4051.
Have you thought about using MESS to do this?
8:05 p.m.
Al Kossow wrote:
The thought hadn't crossed my mind. It's not a bad idea, I should
probably look into it. Honestly, I wrote the 6800 emulator over a
period of two evenings and I find it a good way to get accustomed to a
new CPU (though I guess it's not that much different from the 6502 I
already know...) but maybe it makes more sense to integrate the 4051
emulation into MESS...
Josh
On 1/4/10 10:46 PM, Josh Dersch wrote:
Been distracted by other shiny objects
:). Lately, I've been working on
finishing (for some value of "finish") version 0.3 of PERQemu; I have
the 16K CPU mostly done, fixed a number of hardware bugs, started on
GPIB support and have done a small bit of optimization that improves
performance by about 75%. And Accent S4 is almost usable!
http://yahozna.dyndns.org/projects/PERQemu/accent-startup.jpg
http://yahozna.dyndns.org/projects/PERQemu/accent-sapphire.jpg
Been tackling a real RasterOp emulation on and off, and it's time to
bite the bullet and actually do it (getting Accent to run properly
basically requires it, as my hacks that work for POS are not
sufficient.) But I've kind of burned myself out on it at the moment, so
I thought I'd tackle something lighter-weight for awhile.
Decided to dust off an old software project -- at
one point I was
working on a Tektronix 4051 emulator, a machine based on the Motorola
6800 CPU.
I was just wondering what happened to that 
I've coded up a simple 6800 emulation &
disassembler but I'm lacking
some simple 6800 code to test out its accuracy on "real" code. I'd like
to put it through its paces on a simple piece of hardware before
tackling the (mostly) undocumented quirks of the 4051.
Have you thought about using MESS to do this?
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6 comments
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participants (4)
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aek＠bitsavers.org -
derschjo＠mail.msu.edu -
dgriffi＠cs.csubak.edu -
hilpert＠cs.ubc.ca