Tag: parallel bus

2 matching upgrades

Showing 2 products.

StatusProductWhat it doesCompatibilityLinks
AvailableChecked Jul 27, 20265cfab 1090XL Modernized Reproductionby 5cfab
1090xlparallel buspbiexternal upgrade

Adds five 1090XL-family expansion slots to an Atari 600XL or 800XL through the rear parallel bus.

The page reported one system in stock on 2026-07-27. The 50-pin parallel cable is included, but a compatible 9 VAC Atari power supply is not. Expansion cards and the optional 12 V supply configuration cost extra; the seller says no currently available card needs that optional 12 V rail. Systems are assembled on demand and may take several days to ship.

Sources
  • 1090XL-family expansion systems Exact model
  • Atari 600XL Exact model
  • Atari 800XL Exact model
5cfab 1090XL reproductionAtari Museum 1090XL history
Find usedChecked Jul 25, 2026Commodore IEEE-488 Interface Cartridgesby Commodore
ieee 488cartridgeparallel busdisk driveprintermodemperiod upgrade

Period cartridge interfaces connect a C64 or VIC-20 to PET-style parallel disk drives, printers, modems, and other IEEE-488 equipment.

These are original period interfaces to find used or reconstruct from archives, not current products. Match the cartridge to the exact computer and verify its ROM. The original C64 software occupies part of the $C000 area and disables serial IEC; Andre Fachat's separate modified C64 KERNAL can retain both buses, but it is not part of the cartridge.

Sources
  • Commodore 64 Exact model
  • Commodore VIC-20 Exact model
Commodore IEEE-488 interface indexC64 IEEE-488 archiveVIC-20 IEEE-488 archiveSearch eBay