[ IDENTIFIED ENCLOSURE // IBM PCJR MODEL 4860 (1983) ]
IBM PCjr 4860 System Chassis
Small desktop console enclosure, approximately 13 × 12 × 3 in; expansion sidecar and external power unit increase installed footprint. Keep side connector exposed for IBM sidecars.
VARIANT / ARCHIVAL CAVEAT: 4860-004 and 4860-067 configurations and sidecars differ. Identify the model number and memory/ROM revision; preserve sidecar latch/connector cover and original external PSU.
Mechanical specifications and fit
| Catalog identity | IBM PCjr Model 4860 (1983) |
|---|---|
| Dimensions and clearances | Small desktop console enclosure, approximately 13 × 12 × 3 in; expansion sidecar and external power unit increase installed footprint. Keep side connector exposed for IBM sidecars. |
| Drive bays / mounts | No internal floppy bay on base unit; 5.25-inch diskette drive is external (IBM 4863). |
| Board, system and compatibility | PCjr system board and rear/side connectors are proprietary. Memory/parallel/serial expansion via sidecar stack; PCjr power supply differs from IBM PC 5150. |
| Revision / identification | 4860-004 and 4860-067 configurations and sidecars differ. Identify the model number and memory/ROM revision; preserve sidecar latch/connector cover and original external PSU. |
Preservation and installation notes
4860-004 and 4860-067 configurations and sidecars differ. Identify the model number and memory/ROM revision; preserve sidecar latch/connector cover and original external PSU.
PCjr system board and rear/side connectors are proprietary. Memory/parallel/serial expansion via sidecar stack; PCjr power supply differs from IBM PC 5150.
- Capture the complete model/SKU, serial/date label, board assembly and bay/backplane/riser identifiers before disassembly; keep matched screws, trays, carriers, feet and cables with the case.
- Check the cited manual's specific build option before transferring hardware. Published maximum GPU, drive, fan or radiator capacity may not be simultaneous when a removable cage or alternative riser occupies that volume.
- For rack and vintage systems, preserve the exact rails, shields, doors, brackets and model-specific safety instructions; do not infer compatibility from a familiar brand or physical connector shape.
Manufacturer manuals and archival sources
- IBM PCjr Technical Reference — Internet ArchivePrimary manufacturer or model-specific technical/manual reference used for the identification and mechanical data above.
- IBM Archives — PCjr historical referenceSecond product manual, manufacturer resource or established technical archive; choose the exact regional SKU and revision. Original page is gone; this is the Internet Archive’s copy.
When exact dimensions depend on configuration, the text says so; verify the measured specimen before making a fit or restoration decision.