[sebhc] what's this emulator?
ab31 at juno.com
ab31 at juno.com
Sun May 23 18:45:26 CDT 2004
Hi, this is Andy Becker. I helped Dave Shaw test and tune up his "Project
8080" H8 emulator for the Macintosh a while ago. It was much too slow for
my Macintosh 7100/80 when I first tried it. The Power PC Versions run a
little faster than a real H8 for me.
I never owned an H8 but a few years ago a bought an H89 and an H100 (or
is it HZ1000?). The H89 came with a lot of books and disks. Neither works
quite right. The H89 seems to have a mismatch between the serial
parameters of the CPU board and the terminal board after it boots a disk.
It has some kind of fast replacement motherboard. The H100 has a hard
disk and it boots ZDOS (like MS-DOS) but I think it had one bad letter
key and I was not able to use the floppy drive. Some day I intend to fix
them. I moved recently and they are packed up.
I am familiar with some of the older computers. I learned about BASIC in
high school on some kind of minicomputer (maybe a PDP-8) and later a
Radio Shack TRS-80 Model 1. Later my Dad bought a TI-99/4A and I made
lots of BASIC programs with it. Then I collected lots of other older
popular Models. Lately I've been trying to write a word processor in
some other languages including Fortran, Pascal, assembly language (three
versions), Forth and C. I'm only confident with BASIC.
I see Dave Dunfield is working on an emulator for PC computers. Is this a
version of the emulator for the Macintosh or something completely
original? What are the requirements for it? Does it need Windows? I have
a Compaq Pressario 2200 which has a 180 MHz 486 (actually a MediaGX) and
32 MB RAM. It works nicely with the Altair emulator, about five times as
fast as a real Altair. Dave, if you're converting "Project 8080" you
should know that there were some minor problems left in the CPU. I think
a flag register bit called "auxiliary carry" was not always set right.
Most software doesn't use that so it didn't make much difference. I have
some books about the 8080 and Z80 processors which I used as a guide when
making segments of code for the CPU. I'm not sure if I could find them
quickly or not. I remember having some ideas to make the CPU run a little
faster that didn't get into the emulator.
I'll try to download that emulator (assuming it's available by internet)
and give it a try. I plan to visit the library and download it to a
floppy disk. I don't trust the internet on my PC right now. Strange
things are happening, like certain files getting corrupted, the recycle
bin no longer storing deleted files, and hard disk activity when I read
certain spam e-mail messages. I decided to downgrade to an old version of
the Juno e-mail software that doesn't understand attachments and HTML.
After examining the messages that cause disk activity, I decided that the
cause is probably something in the e-mail header called "X-MAIL-INFO"
with a long string of hexadecimal digits after it. My guess is that it
has meaning only to the Juno program. I hope I can find some kind of
virus scanner or spybot scanner that will identify the problem.
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