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v1.19.7: Windows 95 boots to the desktop

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Jeff Parsons 2015-09-21 18:37:44 -07:00
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Some Success With Windows 95
---
Today, the last serious bug preventing a successful boot of Windows 95 was fixed. I won't bore you with
the details.
OK, I will: three arithmetic instructions (specifically, **AND**, **OR** and **XOR**) include a variation that
converts an immediate signed byte into a signed word. Those variations were failing to truncate the result when
a 16-bit operand size was in effect, and if the destination was a register, the upper 16 bits of that register
could become corrupted.
The [Windows 95 Test Machine](/devices/pc/machine/compaq/deskpro386/vga/4096kb/) hard disk has been updated
with a complete set of Windows 95 files from a "Compact" installation, and first boot has finished, so instead
of the initial "Getting ready to run Windows 95 for the first time..." splash screen, you'll see the normal
Windows 95 startup screen.
The machine is still a bit finicky. It easily gets confused about the state of its shift keys if you switch away
from the browser and then back again. And Explorer windows don't open in the correct view; for example, both
**My Computer** and **Recycle Bin** open the same (incorrect) view. And if you close an Explorer window, reopen it,
and click around on the menus, a crash will likely result.
The adventure continues.
[Embedded DeskPro 386](/devices/pc/machine/compaq/deskpro386/vga/4096kb/machine.xml "PCjs:deskpro386:::debugger")
*[@jeffpar](http://twitter.com/jeffpar)*
*September 21, 2015*