On Wed, Feb 20, 2013 at 12:08 PM, Sellam Ismail <sellam at vintagetech.com> wrote:
Hey, I used to have one of those. In fact, I used to have THIS VERY SAME
UNIT.
I used to have one, too. I got a pre-release unit for testing. Not
sure what happened to it. Have the manual, have the plastic shell,
but inexplicably (for me, at least), no boards. I think somewhere I
must have a 1541 on a shelf with the Apple II disk board (it wedge
into the C= drive case between the regular "DOS board" and the drive
mechanism, and provided an Apple II 20-pin drive connector so you
could just plug it right into any Apple II disk interface, brand-name
or clone.
It was an interesting beast, but IMO came to the market a bit late and
a bit expensive for what you got. It did work. I ran lots of
software, especially games, on it and I don't recall any huge problems
(maybe a few minor ones). It has its own 6502 and ROMs and video
circuit, so really, it's an Apple II clone with a built-in video MUX
and disk mux that borrows a few things (like the keyboard) from the
"host". There were keystrokes to switch which "personality" owned
the
video output and disk and listened to the keyboard, but as long as
both CPUs weren't trying to simultaneously do disk I/O, their code
kept running.
I used this implementation "feature" to do an interesting thing -
Infocom games run from RAM except when they need to read in new code
and text from the floppy. In particular, they don't do disk I/O while
waiting for the user to type more commands. I booted up one side
(probably the Apple first) and started, say, "Enchanter", then once I
scrolled through the text to the first prompt, replaced the Apple
"Enchanter" disk with a C-64 "Sorcerer" disk and started that game.
Once that game rolled through all the text to the first prompt, I
swapped disks and active CPUs again and could alternate play from one
machine to the other. If I'd had the money at the time to afford a
dedicated Apple II drive, I could have made _that_ its Drive 0 and not
swapped disks, just keyboard and video. It was still a fun way to
abuse the system.
Once Apple IIs started getting really cheap (by the time the GS was
out, not many people wanted a crufty old II+ anymore), I got one of
those and shelved the Mimic. I wish I knew why I removed the
mainboard and what I did with it. They didn't make very many of them
so I doubt I'll be able to replace it. I do have the original docs
and Apple-side disc for it. At some point, I should probably make an
archive of it since someone is probably interested in them.
-ethan