Intel KU82303-25

The Intel 82303 combines Micro Channel card setup, parallel-port logic, peripheral-bus address latches and motherboard setup support. It operates with the 82304 local I/O support chip and 82077 floppy-disk controller in Intel's described reference chipset. It is not a standalone CPU, floppy controller or general-purpose modern parallel-port interface.

• Standard and bidirectional extended-mode parallel-port logic.
• Micro Channel Card Setup Port at address 96h.
• Latched peripheral-bus address and selected decode signals.
• Motherboard setup-port and reset support.
• Consolidation of discrete logic in the documented Intel chipset.

The bus interface accepts unlatched Micro Channel address signals and presents latched peripheral-bus address outputs. The parallel-port block supports normal and bidirectional extended operation, with external connector drivers still required. The setup block produces individual card setup selects and software-initiated resets. Motherboard support includes strobes for setup ports 101h and 103h. Check the IBM and Intel programming references for register-level operation.

Intel states a 100-pin plastic quad flat package for the 82303 family. The catalog field says 100-QFP and reseller summaries say 100-PQFP. The precise local registry mapping and exact KU82303-25 mechanical lot remain unverified; candidate 100-QFP.jpg is absent locally. Validate the controlled drawing, pin-one position, lead pitch and actual body before assembly.

Assembly checks

• Inspect the gull-wing leads.
• Confirm pin-one orientation.
• Compare the actual lot to the approved footprint.

Intel's 100-pin table groups A[0:2,10:23] Micro Channel address inputs, XA[0:2,10:23] latched peripheral address outputs, and bidirectional XD[0:7] data. IOR#, IOW#, MIO# and ADL# qualify bus activity. Parallel-port controls include STROBE, AUTOFC, SLCTIN and INIT; status includes ACK#, BUSY and ERROR#. Use the original numbered pin table, not this summary, for wiring.

The -25 suffix speed and lot electrical classification have not been verified from an exact manufacturer order record; do not extrapolate limits from family data alone.

No internal alternate is linked or qualified. The 82303 -20 grade and the 82304 companion cannot be assumed interchangeable with this exact -25 code. Confirm package, pinout, timing, firmware register usage and provenance before substitution.

Intel authored the 82303 Local I/O Support Chip data sheet, order number 290184-001, November 1988. It documents the functional blocks, signals and 100-pin family package. This original family source supports technical behavior, but a controlled exact KU82303-25 ordering record is still needed to establish its grade and lot.

• Maintenance of Micro Channel-compatible motherboards.
• Legacy parallel-port and card-setup circuitry.
• Qualified 82303/82304/82077 peripheral-chipset systems.

Check full Intel and speed-grade markings, date and lot codes, lead condition and source traceability. The catalog lists 260 units at USD 40.00, minimum seven, without tier prices. An exact-code resale index lists 260 units with USD 39.38 at 25 and lower prices at larger quantities, while other sellers report much larger stock and varying quotes. These are not a dated direct authorized quote and cannot be reconciled with confidence; no catalog commercial field has been changed.

Keep this listing in manual review and noindex. Confirm the exact KU82303-25 order code, mechanical drawing and register mapping, restore a verified JPG, and reconcile current stock and price against a dated qualified supplier quote before publication.