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AX = 6F02h BL = new value for extended control register (see #00190)
Return:
AX,BL destroyed
Notes: This function is only valid when an HP MultiMode Video Display Adapter is installed. The Extended Control register is at I/O address 3DDh
Bitfields for HP Vectra extended control register: Bit(s) Description (Table 00190) 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
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