Tag: fast math

Adds Hias high-speed SIO and Fast Math F+ through a 1090XL-family expansion card.

The page reported two cards in stock on 2026-07-27. The sale includes only this card; the 1090XL-family base system and the separately pictured CP/M card are not included.

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.

Replaces the Atari 800 personality module with selectable operating systems, faster floating-point code, and configurable extra memory.

The page reported four boards in stock on 2026-07-27. Functions that use $C000-$CFFF are mutually exclusive, so Omnimon and 128 KB Mosaic memory cannot be enabled together. Axlon cards require RAMROM's onboard RAM to be disabled. The optional DS1210 backup controller and coin cell are user-supplied; the seller page inconsistently calls that cell CR2032 and CR2023, so verify the fitted holder before buying a battery.