Graphics Controller; Ports; Vmebus Master Interface; Keyboard Controller - Xycom XVME-678 Manual

1.3.5 Graphics Controller
XVME-678/688 Manual
July 1994
The XVME-678/688 VGA graphics controller supports all IBM VGA, EGA, CGA, and MDA modes to
the register level. The VGA adapter supports Super VGA up to 1024 x 768 with 16 colors. The VGA
BIOS is 8 bits. Shadowing the BIOS through the BIOS Setup Menu (see Chapter 3 for more information)
significantly increases system performance.
The VGA controller supports IBM modes 0-13H (hex) as well as other modes. See Appendix C for a
complete list of supported modes.
1.3.6 I/O Ports
The XVME-678/688 has two RS-232C serial ports and one IBM PC/AT style Centronics-compatible
parallel port. These ports are controlled in the BIOS Setup Menu which allows the ports to be disabled
or enabled from software. Interrupts are enabled or disabled by setting bits in 110 registers (refer to
Chapter 5).
1.3.7 VMEbus Master Interface
The VMEbus master interface allows the 80386SX CPU to become a master or interrupt handler on the
VMEbus. The XVME-678/688 master interface is invoked whenever the 80386SX accesses the VMEbus
Standard, Short 110, or lACK address spaces. All accesses to the VMEbus are through the Real Mode
Window.
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3.8 Keyboard Controller
The XVME-678/688 keyboard controller is PS/2 compatible and supports not only the PS/2 keyboard,
but also provides an auxiliary input port for a PS/2-compatible mouse, trackball, etc.
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