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Chapter 19: Installation and Service
Installing Hardware
2 Determine the placement of the emulation memory modules. Three types of modules may be installed:
256 Kbyte (HP 64172A), 1 Mbyte (HP 64172B), and 4 Mbyte (HP 64173A). Any of the emulation
memory modules can be installed in either memory slot on the probe. Do not use HP 64171A/B
modules; they are too slow.
Memory in memory slot 0 is divided into four equal blocks that can be allocated by the memory mapper.
Memory in memory slot 1 is divided into two equal blocks.
If you have only one emulation memory module, place it in memory slot 0.
If you have two memory modules of different sizes, place the memory module with the greatest capacity
in memory slot 0 to take advantage of the way memory slot 0 and memory slot 1 are divided by the
emulator. For example, if you install a 1-Mbyte module in memory slot 0 and a 256-Kbyte module in
memory slot 1, then the emulator will provide four 256-Kbyte blocks of memory in memory slot 0 and
two 128-Kbyte blocks of memory in memory slot 1.
If you install any 4-Mbyte memory modules (HP 64173A) on the emulation probe, the emulator will
detect their presence and add one wait state to accesses it makes to emulation memory. The 4-Mbyte
memory modules are not as fast as the 256-Kbyte and 1-Mbyte memory modules.
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