Tag: pass through

Moves the Atari 1200XL cartridge slot outside its recessed tunnel and adds switchable OS 6.42 and BASIC firmware.

The page reported three cards in stock on 2026-07-27. OS 6.42 adds bug fixes, high-speed SIO, faster floating point, CX-85 handling, WozMon, and cassette improvements. Its activity LEDs do not work when the computer has more than 64 KB, and some software is incompatible because the replacement OS runs from RAM; the front switch disables that OS when needed. Only the card is included.

Adds adjustable CRT-style dark lines to a compatible progressive VGA signal before it reaches a modern display.

The ArcadeForge maker page remains online but exposed no clear current price or Add to Cart control on 2026-07-30. Arcade Express marked its unit out of stock, while Jammastar displayed both a last-items warning and a notify-when-available control. Confirm stock before ordering. The maker designs the device around 640 x 480 VGA. A stock C64, C128, or other 15 kHz computer cannot connect directly; it first needs a suitable scaler that produces a supported progressive VGA signal.

Adds a battery-backed real-time clock to Atari XL and XE computers as an internal module, pass-through cartridge, or circuit inside another cartridge.

The project page publishes a parts list, clock and address-decoder schematics, battery and rechargeable-cell backup circuits, and an ARC handler archive. It recommends internal installation because the pass-through and inside-another-cartridge forms may cause more problems. The page does not provide a step-by-step bus-wiring guide: an internal build must source D0-D3, A0-A7, R/W, phase 2, power, and D5xx cartridge-control signals, while a cartridge build uses the cartridge connector. No explicit project license or current assembled seller was verified.

Adds AY sound, stereo output, joystick and mouse modes, reset controls, and edge-connector pass-through to ZX Spectrum-compatible expansion buses.

The seller exposed a login-or-register-to-buy path on 2026-07-27. The page describes ZX Spectrum and compatible expansion-port use but does not give an exact computer, power, or later-Amstrad compatibility matrix. Human review supplied no readable model-specific evidence, so the record remains only on the shared expansion-bus page. Confirm the intended machine and power off before changing the edge connection or input hardware.

Adds two configurable Atari-style joystick or mouse ports and a pass-through connector to broadly compatible ZX Spectrum expansion buses.

The seller exposed a login-or-register-to-buy path on 2026-07-27 and spells the listing name Kemspton MAX 2. Power the computer off before connecting or removing the interface, joysticks, or mouse. Original Sinclair joysticks are not supported. Human review supplied no readable exact-model matrix, so the record remains only on the shared expansion-bus page; confirm power rails and later Amstrad-model behavior before purchase.

Adds a battery-backed real-time clock and calendar to Atari 8-bit computers through the cartridge port.

The collection marked both versions sold out on 2026-07-24. The stand-alone version is no longer supplied with a case. The drop-in version is an assembled board intended for an original R-Time 8 shell. The seller estimates three to five years of battery life.