Pulled the blog posts into the other branches

_posts/2014-10-23-improved-pc-dos-700-support.md

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+---
+layout: post
+title: Improved PC-DOS 7.00 Support
+date: 2014-10-23 11:00:00
+category: Releases
+permalink: /blog/2014/10/23/
+---
+
+[PCjs v1.15.6](https://github.com/jeffpar/pcjs/releases/tag/v1.15.6) is a fairly minor update that fixes a few
+Floppy Drive Controller (FDC) issues and one CPU emulation bug that prevented [PC-DOS 7.00](/disks/pcx86/dos/ibm/7.00/)
+from working properly.
+
+There are also some Debugger improvements; for example, if you turn on "fdc" and "int" messages in the
+Debugger using the "m fdc on" and "m int on" commands, all FDC (INT 0x13) software interrupts will be logged,
+including descriptions and register values.
+
+PC-DOS 7.00 still can't be setup from its specially-formatted 1.84Mb
+[XDF](http://www.os2museum.com/wp/the-xdf-diskette-format/) distribution disk images, "PC-DOS 7.00 (Disk 2)"
+through "PC-DOS 7.00 (Disk 5)", so your best bet is to boot from the 1.44Mb "PC-DOS 7.00 (1.44M Boot)".
+
+Note that you must also use a fairly new 80286 machine configuration, like this
+[8Mhz IBM PC AT](/devices/pcx86/machine/5170/ega/1152kb/rev3/debugger/),
+in order to use 1.44Mb diskette images; previous models did not support 3.5-inch diskette drives, unless they had been
+retrofitted with a newer [BIOS](/devices/pcx86/rom/5170/).
+
+*[@jeffpar](http://twitter.com/jeffpar)*  
+*October 23, 2014*