Vax 613 0S Instruction Manual Page 206

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14.3 Map of Memory Following Power-Up Initialization
Thirty-two megabytes of memory are tested on power up: two megabytes of
memory are used for the system firmware and any required data; the remaining
thirty megabytes will be used to load in secondary boot program. The first two
megabytes of memory are always the lowest two megabytes of good memory.
Figure 18 shows a map of this memory:
Figure 18 Map of Memory Following Power-Up Initialization
MR−0141−93RAGS
Virtual REX Memory Region
HWRPB Data Structures
PALcode
Rest of the System Firmware
PAL Impure Area
Console Data Structures
Page Tables (This Takes the Most Space)
(Scratch RAM, Dynamic Data, NI Buffer...
320 KB
2 MB − 320 KB
Max 8 MB
MEMSIZ−
Balance of Memory
One Megabyte for Secondary Boot
Rest of Memory (Untested)
Bottom of Memory
Top Of Memory
14–6 Powerup Initialization and Firmware Entry
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