Tag: geos

Adds an inexpensive battery-backed real-time clock to a Commodore 64 through the user or cassette port.

The current project page provides version 1.0 software and exact wiring for three C64 connection choices. Gregory Nacu's i2c6502 source independently documents the C64 user-port PB2/PB3 implementation and DS3231 example under the MIT license. A generic RTC module, connector or pass-through board, wire, and battery are separate. Many inexpensive modules include a charging circuit intended for a rechargeable cell; follow the project's component-removal instructions before substituting a CR2032 or CR1225 primary cell. The Timo Voutilainen package does not state a hardware fabrication or software license.

Provides 1 MB or 4 MB of geoRAM-compatible cartridge memory for the Commodore 64 and 128.

GGLABS marks both technical projects released, but the current GRAM/4D Tindie listing says the seller is taking a break and no current GRAM/1D order path was verified. The published pages are useful technical documentation but do not expose a complete fabrication package. GeoRAM-aware software is required. GEOS 2.0r can use at most 2 MB; the full 4 MB needs patched GEOS 2.0r+, GEOS MP3, Wheels, or another compatible program.

Open low-power 2 MB geoRAM-compatible expansion cartridge for the Commodore 64.

The assembled Tindie cartridge was out of stock on 2026-07-24 and had been sold out since June 10, 2024. The open design remains buildable. This is geoRAM memory, not an REU: software must explicitly support geoRAM. Most C64 programs use neither expansion-memory type, and GEOS needs an added geoRAM driver on its boot disk.

Adds 512 KB of bank-switched geoRAM-compatible cartridge memory to a Commodore 64 or 128.

The Shareware Plus page was updated on 2026-01-01 and says the cartridge is in stock by email order. Protovision also maintains a current product listing, but its extracted page does not expose a stock or checkout control. This is geoRAM memory, not an REU; software must explicitly support the geoRAM interface.

Adapts a USB mouse or digital USB joypad to supported Amiga, Atari ST and STE, or Commodore 64 GEOS mouse ports.

The product page exposed a login-or-register-to-buy path on 2026-07-27. Only digital joypad input is supported; analog controls are not. TIKUS is distinct from the visually similar, non-upgradable Tank Mouse Kickstarter adapter. The revision sold since 2026-03-24 adds stored per-axis sensitivity configuration for Amiga and Atari mouse modes.