PORTIBM PC Portable (uses same BIOS as XT) 42EE-42EF - ATI Mach32 - MEMORY BOUNDARY REGISTER
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 5EEEh"Mach32"

42EEw RW  memory boundary
	bits 3-0: VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers./8514 boundary in 256K units (VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers. only below, 8514 above)
	bit 4: partition enable: VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers. and 8514 drawing engines may only write
	      within their respective partitions
	bits 15-5: reserved