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Bitfields for HP Vectra extended control register

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Bit Description

0

screen resolution
0 = 200 lines
1 = 400 lines

1

underline enable (if set, 'blue' of fg color = underline)

2

font
0 = Standard-8,
1 = HP-Roman-8

3

memory disabled for CPU access

4

allow access to full 32K memory instead of wrapping at 16K

5

select second 16K page instead of first

6, 7

unused