Growing Support for IBM Compatibles

This release adds limited (but growing) support for more IBM-compatible machines, such as:

• AT&T Personal Computer 6300
• Columbia Data Products MPC 1600
• Zenith Data Systems Z-150

The MPC 1600 is noteworthy because it was the first genuinely IBM-compatible machine, predating the COMPAQ Portable. But being first to a party is no guarantee of success, which COMPAQ went on to enjoy for many years, while Columbia Data Products fizzled into oblivion after only a few years.

The complete list of supported machines is at http://www.pcjs.org/devices/pc/machine/.

This release also incorporates enhancements to the savePC() and getResource() interfaces, courtesy of pull requests #31 and #32.