F65510

Manufacturer Part NumberF65510
DescriptionControllers, Flat Panel VGA Controller
ManufacturerIntel Corporation
F65510 datasheet
 


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®
HERCULES CONFIGURATION
REGISTER (HCFG)
Write only at I/O Address 3BFh
D7 D6 D5 D4 D3 D2 D1 D0
Enable Graphics Mode
Enable Memory Page 1
Reserved
This register is effective only in Hercules mode. It is
accessible in Hercules emulation mode or if the
extension registers are enabled. It may be read back
through XR14 bits 2 & 3. It is cleared by RESET.
0
Enable Graphics Mode
0 Lock the chip in Hercules text mode.
In this mode, the CPU has access only
to memory address range B0000h-
B7FFFh (in text mode the same area
of display memory wraps around 8
times within this range such that
B0000 accesses the same display
memory location as B1000, B2000,
etc.).
1 Permit entry to Hercules Graphics
mode
1
Enable Memory Page 1
0 Prevent setting of the Page Select bit
(bit 7 of the Hercules Mode Control
Register). This function also restricts
memory usage to addresses B0000h-
B7FFFh.
1 The Page Select bit can be set and the
upper
part
of
(addresses B8000h - BFFFFh) is
available.
7-2
Reserved (0)
Revision 0.7
display
memory
39
CGA / Hercules Registers
Preliminary 65510