Tag: j12

2 matching upgrades

Showing 2 products.

StatusProductWhat it doesCompatibilityLinks
AvailableChecked Jul 24, 2026J12 Breakout Family for Compact Macsby Joe's Computer Museum
j12catmaclogic board conversionpower breakoutvideo breakout

Breaks out compact Macintosh power rails and video signals for custom logic-board projects.

JCM showed 17 SE/SE30 units and 6 Classic/Classic II units in stock on 2026-07-24. These are custom conversion and test-bench parts, not drop-in upgrades for intact computers. The two Macintosh groups use different J12 signal mappings, so use only the version intended for the installed logic board. JCM recommends 16 or 18 gauge leads with a modern ATX supply on the SE-family board.

Sources
  • Macintosh SE Exact model
  • Macintosh SE/30 Exact model
  • Macintosh Classic Exact model
  • Macintosh Classic II Exact model
J12 Breakout for SE and SE/30 product pageJ12 Breakout for Classic and Classic II
AvailableChecked Jul 24, 2026Macintosh J12 Cableby Joe's Computer Museum
replacement cablej12analog boardlogic boardcompact macrepair

New replacement for the analog-board to logic-board signal cable in four compact Macintosh models.

The JCM page showed 17 units in stock on 2026-07-24. Never use the cable to combine an SE or SE/30 board with a Classic or Classic II board: the identical-looking connectors carry signals on different pins, and mixing the two groups will damage the computers.

Sources
  • Macintosh SE Exact model
  • Macintosh SE/30 Exact model
  • Macintosh Classic Exact model
  • Macintosh Classic II Exact model
Macintosh J12 Cable product page