Vax 613 0S Instruction Manual Page 83

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6.2 CXTurbo Address Map
The CXTurbo has 16 MB of available I/O address space. However, only 4 MB
is used to implement the 8-plane graphics system. Table 14 lists the CXTurbo
address map for 300 and 500 models
Table 14 CXTurbo Address Map
Start
Address End Address Size Description Discussed In
300 Models
1.C200.0000 1.C20F.FFFF 1 MB Reserved, system
FEPROM
1.C210.0000 1.C211.FFFF 128 KB SFB ASIC control
registers
Section 6.3
1.C212.0000 1.C213.FFFF 128 KB Reserved
1.C214.0000 1.C217.FFFF 256 KB GP0 - general purpose
output bit 0
1.C218.0000 1.C21B.FFFF 256 KB GP1 - general purpose
output bit 1
1.C21C.0000 1.C21F.FFFF 256 KB RAMDAC color map and
registers
Section 6.5
1.C220.0000 1.C23F.FFFF 2 MB Frame buffer address
space
1.C240.0000 1.C25F.FFFF 2 MB Frame buffer address
space (alternate)
1.C260.0000 1.C27F.FFFF 2 MB Off-screen buffer
memory
1.C280.0000 1.C29F.FFFF 2 MB Frame buffer address
space (alternate)
1.C2A0.0000 1.C2BF.FFFF 2 MB Off-screen buffer
memory (alternate)
1.C2C0.0000 1.C2FF.FFFF Reserved
(continued on next page)
CXTurbo Graphics Subsystem: 300/500 Models 6–3
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