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Joined: Jan 2011
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there is are a bunch of new Imagewriter floppy images on http://bitsavers.org/bits/IBM/Displaywriter including a version of MSDOS

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Originally Posted by shattered
Self-test on this machine is very, very paranoid -- I think I've found a emulation bug in i8255.cpp smile

And there are two more bugs, apparently. Datasheet shows that INTR bit should go high only after STB is deasserted (goes high); and that asserting STB should always load data into input latch. With these changes, keyboard interface test is happy.

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DW also does not like this line of code in i8255.cpp::set_mode()

m_ibf[PORT_A] = 1; // correct? needed by SAM Coupe Blue Alpha sampler

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Would be good if we could get both happy. If you want to test the Blue Alpha Sampler, start MAME like this:

Code
mame samcoupe -exp blue_sampler -flop1 sam_sound_sampler_software_blue_alpha.dsk

Press any key, then enter "boot" to boot. Wait for it to load, then type L to load and "debbie" as filename. Wait again, then press P to play the sample.

The disk is available here: https://redump.net/files/sam_sound_sampler_software_blue_alpha.zip

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I think this last one can be worked around (read the port at reset time). Other two may be hard to test, I'm going to PR them separately.

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