Groot.rom

    Modified ZX Spectrum ROM, with lots of bug fixes and extensions
    by Henk de Groot [groot@idca.tds.philips.nl]. List of

    changes follows:
    o Bug fixes as mentioned in "The complete Spectrum Rom Disassembly" 
	  by Dr Ian Logan and Dr Frank O'Hara.
    o Support for EPSON printer via an Z80-PIO chip and Centronics connection.
    o Monitor support: start up with black screen and white characters.
    o Lightpen support: Lightpen routine for DK'Tronics lightpen is built in.