HP HP8648A Instruction Manual page 38

Chapter 1: Preparing the Emulator
Step 4. Install emulation memory modules on emulator probe
2 Determine the placement of the emulation memory modules. Three types of modules may be installed:
256 Kbyte (HP 64171A/64172A), 1 Mbyte (HP 64171B/64172B), and 4 Mbyte (HP 64173A). Any of
the emulation memory modules can be installed in either memory slot on the probe.
Memory in both memory slots is divided into four equal blocks that can be allocated by the memory
mapper.
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