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There is an issue with the CD Drive in Windows 95 though. Windows will only detect the CD is in the drive before Windows has started, so I have load the chd cd first then reboot the system, and once Windows has loaded, it will see the disk. If I attempt to eject the disk in Windows, MESS crashes completely and shuts down. If I attempt to insert a CD while inside Windows 95, Windows does not detect the change. A bit of an issue if you've got multiple CD's, works fine otherwise!

Unfortunately, it then hangs apparently waiting for an interrupt from something, maybe from the SB16 or network drivers I have installed in this image.

Nice, hope all our changes in last period did not affect much your work.

IBM sure abused the 386.

Nice progress!

Is there one root cause of all these random things crashing when trying to start up (across all the platforms) or is it really just many different edge cases?

The level of accuracy needed for this stuff to work amazes me, especially when you consider you can get away with implementing an absolute ton of stuff in MAME with 'rand()' and see no consequences ;-)

This one is probably due to LAN Manager init that was in startup.cmd. None of the network drivers loaded so it isn't surprising to see that crash.


OS/2 2 hits all kinds of corner cases. I'd be surprised to see another OS that uses both 286 and 386 call gates (rare enough) to transfer control from less privileged 32-bit code to more privileged 16-bit code.

I'm getting the following error:



when using ramsize other than default (4M or 8M) with the at486 driver.

If I use a ramsize of 16M then it is not recognised as the correct size.

I'm using SVN [r15082] Windows 7 64-bit.

Can anyone else please confirm/deny?

Also, how do I change the refresh rate of the driver from 70Hz to 60Hz?

The maximum it wants to accept is 15M, 16 is treated as 0.. (it wraps basically)

As for changing the refresh rate.. you don't.. the emulated hardware / software config decides that, and the bios screens are at 70.

fwiw trying to install Win98 actually took MESS down during the hardware plug and play detection on current code

-----------------------------------------------------
Exception at EIP=00000000777A2FC6 (not found): ACCESS VIOLATION
While attempting to write memory at 0000000000000008
-----------------------------------------------------
RAX=00000000777A2FC0 RBX=0000000000390760 RCX=0000000000000000 RDX=0000000000390760
RSI=000000000E9FFEA0 RDI=000000000E9F6AA0 RBP=0000000000390760 RSP=0000000000228A90
R8=000000ED006B00B0 R9=000000EE00BB00B1 R10=00000000002E4490 R11=00000000002E0158
R12=000000000E92FFC8 R13=0000000000007802 R14=0000000000000000 R15=0000000000000003
-----------------------------------------------------
Stack crawl:
0000000000228AB0: 00000000777A2FC6 (RtlEnterCriticalSection+0x0006)
0000000000228AF0: 0000000002318DDE (not found)
0000000000228B50: 00000000025C9F57 (not found)
0000000000228B90: 00000000025D5D6D (not found)
0000000000228BE0: 0000000002664245 (not found)
0000000000228C80: 0000000002664315 (not found)
0000000000228D20: 000000000304EE8C (not found)
0000000000228D60: 0000000002318E42 (not found)
0000000000228E00: 0000000002318F0D (not found)
0000000000229010: 00000000023D7CE8 (not found)
000000000022F410: 000000000230559D (not found)
000000000022F8B0: 000000000261A24E (not found)
000000000022FDF0: 0000000001C2357E (not found)
000000000022FE40: 000000000290DF6C (not found)
000000000022FF10: 00000000004013DB (not found)
000000000022FF50: 000000000040113E (not found)
000000000022FF80: 000000007764652D (BaseThreadInitThunk+0x000d)
000000000022FFD0: 000000007777C521 (RtlUserThreadStart+0x0021)

not amazingly useful because it's not a debug build, but still didn't used to happen.

(I am using the new compiler tools mind you)