IBM Aptiva Hardware Maintenance Manual page 20

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Dual Independent Bus architecture separates dedicated external system
bus and dedicated internal high-speed cache bus socketability
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One of the following processors can be installed:
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Intel Pentium II -266 MHz internal, 66 MHz external
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Intel Pentium II -300 MHz internal, 66 MHz external
Memory
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256-KB Pipeline Burst Static RAM (PBSRAM). Fixed onboard at 2137,
built-in Pentium II processor at 2138. (For some 2137 models, it may
come without cache memory.)
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Onboard fixed video Synchronize Graphics RAM (SGRAM). 1- or 2-MB for
Machine Type 2137, 4-MB for 2138.
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168-pin synchronous dynamic random access memory (SDRAM). dual
inline memory module (DIMM) sockets.
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2 sockets design at Machine Type 2137, 3 sockets at 2138.
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8-MB, 16-MB, or 32-MB DIMM (64-MB, 128-MB optional upgrade).
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Gold contacts, non-Parity (64-bit), 100 MHz, 3.3 volt DIMMs.
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Maximum system memory is 256 MB at Machine Type 2137 and
384 MB at 2138. Refer to "DIMM Configurations" on page 5-28.
External Ports
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Video port (15-pin D-sub connector)
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Parallel port (25-pin D-sub connector)
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Serial port (9-pin D-sub connector)
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Game/MIDI port (15-pin D-sub connector)
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Keyboard port (6-pin PS/2 mini-din connector)
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Mouse port (6-pin PS/2 mini-din connector)
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Two USB ports
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Microphone-in jack
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Speaker-out jack
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Line-in jack
General Information 1-3