Vax 613 0S Instruction Manual Page 82

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6.1 Comparison of Features
The 300 models feature the same CXTurbo hardware as the 500 models, with
these exceptions:
300 Models 500 Models
Support 1 video oscillator: 1280x1024
@ 72 Hz—300, 300X, 300LX models;
1024x768 @ 72 Hz—300L model.
Support 2 video oscillators: 1280x1024 @ 66
Hz or 72 Hz (user selectable).
Support only dense space access of
CXTurbo I/O registers and frame buffer.
Support both dense and sparse space accesses.
Do not support byte write operations to
CXTurbo.
Support byte write operations to CXTurbo.
Have no system FEPROM connected
to the smart frame buffer. All system
ROMs (Flash Memory) are connected to
IOCTL ASIC.
Have no such limitation.
In the 300 models, the CXTurbo operates differently from other TURBOchannel
devices in the same models. The CXTurbo is operated at the full TURBOchannel
speed of 25 MHz and is accessible only in Dense I/O space. Appendix A discusses
dense and sparse space as they relate to programming I/O.
6–2 CXTurbo Graphics Subsystem: 300/500 Models
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