Tag: high speed sio

Upgrades an Atari 1050 disk drive for divisor-6 high speed, 180 KB per side, and flashable firmware slots.

Lotharek marks 1050E discontinued. The seller calls installation solderless, but it still requires opening the drive, removing three chips, moving the 6507 CPU, and preserving socket orientation. Confirm that a used kit is complete, that all original chips and sockets are healthy, and that suitable 1050E firmware and host software are available.

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 XL or XE operating-system ROM with a switchless 32-image OS selector and high-speed SIO features.

The official page showed self-installation and professional-installation options in stock on 2026-07-25. The generic kit is for XL and XE computers except XEGS; the special 1200XL kit includes an XE MMU and internal BASIC upgrade. The 1200XL procedure is an advanced modification that can require desoldering and replacing ROM sockets, moving jumpers, adding wires and a resistor, and modifying or omitting the RF shield.