Tag: stm32

Uses an STM32 and SD media as a mature open Atari ST hard-drive emulator with ACSI, disk-image, and GemDrive modes.

The upstream project describes hardware and software version 5.00 as finished and mature. Its release package contains files for ordering a compact board with assembly, but the builder must flash it initially with a 3.3 V-compatible USB-to-UART adapter and supply 5 V USB-C power, media, and an optional CR2032. Firmware 1.x, 2.x, and 3.0-or-later boards have different compatibility paths; the current compact design should use the matching current firmware. Lotharek's separate four-slot ACSI2STM Redux case design remained not yet available on 2026-07-27 and is not represented as a current assembled seller.

Microcontroller-based plug-in replacement for a C64 or C128 6581 or 8580 SID with software configuration, updateable firmware, and analog control inputs.

The official Retrocomp product page showed more than 10 ARMSID v1f units in stock at EUR 34 on 2026-07-28.

Implements an experimental STM32-based USB host for operating ISA cards on an external backplane.

Treat this as an unfinished development platform, not a turnkey USB-to-ISA product. The repositories provide Revision A fabrication files and early STM32 firmware but no documented host application, VM integration, release, or end-user procedure. A linked 2020 development thread demonstrates predecessor Arduino Mega experiments with serial ISA reads and writes, isapnptools, an Aztech sound card, and PCem, but does not establish that those workflows were implemented for ISASTM. Revision A has signal-integrity and reset-pull-up errata, and USB High-Speed is untested and may not work. The required ISA backplane supplies power.

Emulates Disk II, UniDisk 3.5, and SmartPort storage from an SD card with an STM32F411.

The project README linked a current assembled eBay listing on 2026-07-27 and also publishes a complete build path. An innoelement assembled variant showed six units on Tindie, but that page simultaneously displayed a shipping rate and said it did not ship to the United States; confirm checkout availability before relying on it. Match the board revision, bootloader, and firmware: bootloader 0.15 has an Apple IIgs SmartPort problem, and boards older than Revision 3 need a trace modification for Apple IIc or IIgs use. Use a quality FAT32 SD card with 32 KB clusters. Never connect an ST-Link programmer while either USB or the Apple II powers the board.