A new version of the firmware for the Ultimate-64 / U2/U2+ by Gideon is released.

Difference with previous release V1.26 / V3.6a:

• Debug stream over Ethernet, which logs CPU / VIC access real time, also possible to log C64 CPU and 1541 CPU alongside. U64 only.
• ACIA (MOS 6551) emulation.
• Modem Layer emulation (6551 <-> LAN), supporting both outbound and inbound connections.
• REU load / save commands from UCI, using the preload settings.
• File append mode for Software IEC.
• Support for SuperGames cartridge.

Bug fixes:

• Issue #121: 1541C ROM seemed faulty. Track 0 sensor reconnected.
• Issue #119: Fixed network host name illegal chars.
• Issue #127: Fix for Epyx Fastload at boot U64 (consider DMA to stop discharging the cap.)
• Fix for KCS cart at boot of U64.
• Fixed DMA load delay, to let 1541 initialize before running PRG.
• Fixed 1541 address decoding (RAMBOard was faulty!)
• Fixed Closing telnet connection caused U64/U2+ to freeze.
• Stability issues fixed in configuration manager.
• Corrected NMI / IRQ routing for internal cart. (U64)
• Timing corrections to make external 1764 REU work. (U64)
• Some U64 factory test improvements. Invisible to you.

Planned work for the upcoming release:

• CPU Speedup.
• Keystrokes to quickly enable / mute audio channels.
• A sample project for the ESP32, which can be used for others to port stuff like modem emulation.

Download:

• U64/Ultimate-64 v1.28 - U2/U2+ v3.7 (652)

Documentation updated:

• Lightweight modem emulation layer.
• Debug stream.

source: ultimate64.com github.com