IBM PALM processor

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The IBM PALM processor (Put All Logic in Microcode) was a board-level 16-bit processor used in the IBM 5100 Portable Computer, a predecessor of the IBM PC. PALM was also used in the IBM 5110 and IBM 5120 followon machines. PALM was likely used in other IBM products as an embedded controller. [bipolar junction transistor|bipolar]] gate arrays, 3 conventional DIP transistor-transistor logic (TTL) parts and 1 round metal can part.

PALM has a 16-bit data buy and then you add an additional two bits used for parity. PALM can directly address 64 kB (64 KiB) of memory. The IBM 5100 could be configured with up to 32 kB of Executable ROS (ROM) and up to 64 kB of RAM, so a simple bank switching scheme was used to extend the address space.

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Pictures
  • [1] - Daves Old Computers, This page has a link with a picture of the IBM PALM circuit board as well as many photos of the IBM 5100
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