On 04/28/2013 12:00 PM, Mark Morgan Lloyd wrote:
Bart wrote:
On 4/27/13, Reinier Olislagers <reinierolislag...@gmail.com> wrote:
Noticed that an 8086 branch was merged to fpc trunk. Is it time to get
out some 5.25" diskettes[1]?
[1] Shame I dumped all the accompanying hardware long ago ;) Perhaps
break out DOSBOX ;)
I still have a portable (ahum, > 5 kg) IBM XT with 5.25" floppy disk.
HD is appr. 10 MB (decaying...)
Problem of course wil be to get the compiler on the floppy disks, and
then hope my HD is large enough.
(It cost about 10,000 Dfl (appr 4,500 € / $ 5000) at the time of
purgase.)
I've definitely got at least one system around older than a '386, but
if it really is supposed to be an 8086 target it would have to be
tested on an 8086/8088 because of extra opcodes that were added to the
186/286. I think I've got a system with 8086 or possibly V20, but it's
non-PC and I don't know where its copy of DOS is (it usually ran CCP/M).
I don't know how reliable a test something like Dosbox or Bochs would
be, some of them vitualise the underlying hardware while others are
sloppy about what opcodes they actually implement.
So in practical terms, a strict 8086 port is probably untestable. But
why would anybody want to when even embedded processors are based on a
newer architecture?
Actually, I have a vintage IBM PC 5150, with a 4.77 MHz 8088 processor,
so this isn't true, it's very testable actually :) However, the i8086
code generator still generates some 186/286+ instructions, so it doesn't
work there yet, but I'm planning to fix this shortly. Here's a video of
a few very simple Free Pascal compiled programs on a true 80186:
https://www.youtube.com/watch?v=wscin9RUiTU
(sorry for the shaky camera)
And here are the same programs, running on Charlie's (Karoly Balogh)
Amiga 2000 with a A2286AT expansion card for PC emulation, which
contains a real 286 CPU:
http://charlie.amigaspirit.hu/screenshots/a2000/A2000-FPC-8086-01.png
and up to -07.png
Here's the 286 card: http://amiga.resource.cx/exp/a2286at
Nikolay
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