FANUC A20B-3300-0291 486 CPU Card with 16 MB DRAM for Series 21i-B / 0i-C

Verified A20B-3300-0291 CPU Configuration

The FANUC A20B-3300-0291 is a 486 CPU card with 16 MB of DRAM. FANUC identifies it as CPU ID 09 with DRAM ID 89. It is documented for Series 21i/210i/210is Model B and in Series 0i-C / 0i Mate-C hardware. FANUC also notes its use on a Series 21i loader control board.

CPU Card, Not a Standalone Memory Module

The 16 MB specification refers to working DRAM on the CPU card. FANUC lists the FROM/SRAM module separately: FROM stores control software, while SRAM is battery backed. A20B-3300-0291 should therefore be classified as a CPU Card / Main Control PCB, not as a CNC memory module.

16 MB Model Identification

Do not select a replacement by processor family alone. In FANUC’s 0i-C list, A20B-3300-0291 is the 486 / 16 MB version, A20B-3300-0290 is the 486 / 32 MB version, and A20B-3300-0313 is the Pentium / 32 MB version. Interchangeability must be confirmed against the original CNC configuration.

• Match the complete A20B-3300-0291 drawing number
• Confirm 486 CPU, 16 MB DRAM and the applicable CNC series
• Compare PCB edition, suffix, connector layout and main-board configuration
• Use qualified CNC personnel for installation and system checks

Source a Tested FANUC CPU Card

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