Project Status

Discontinuation Notice ES40 emulator development has virtually been halted since 2009. The lead developer of ES40, Camiel Vanderhoevenis developing both Freeware and Commercial Alpha and VAX emulators for Migration Specialties. FreeAXP is the Freeware Alpha emulator from Migration Specialties. Avanti is the Freeware Alpha emulator from Migration Specialties.

Working Towards: Version 0.19 release The most noticeable change in version 0.19 will be increased use of threading. In version 0.19, almost every device will run it's own execution thread, which will allow the emulator to make better use of multiple processor cores (if available), and will open up the way to emulating an ES40 with multiple CPU's. The latest development snapshot available is Snapshot 20080503_1030.

ES40 Emulator Project Status Current: Version 0.18

Recent changes 16-MAR-2009: David Hittner has fixed a problem in the CPU's handling of super-page bits. 16-MAR-2009: Camiel Vanderhoeven and Volker Halle have fixeded a problem in the CPU that caused decnet to crash on booting. 29-APR-2008: Brian Wheeler has implemented a mostly-working floppy controller. 29-APR-2008: Camiel Vanderhoeven has made non-PCI Disk Controllers possible. Working on... Brian Wheeler is working on perfecting the Floppy disk implementation. Camiel Vanderhoeven is acting as gatekeeper for the project, but too busy to do a lot of development right now. Message from the creator Apr-2009 David Hittner is working on improving the DEC 21143 network interface. Eduardo Marcelo Serrat is exploring dynamic instruction translation. Martin Borgman is working on improving Mac OS X host support.

Problem areas We know of shortcomings in the following areas: Timing problems introduced with the new threading model (needs research) Multiple CPU's exhibit strange behaviour or refuse to become members of the active set (would love to have better SRM specs) Ethernet has problems with non-trivial amounts of data (FTP, for instance) (needs research) TCP/IP does not work with DHCP (needs research) Problems in floating-point emulation (would love to have a CPU test suite) Wannahaves These are some of the things we'd love to do in the future: Dynamic Translation rather than Interpretation of CPU Instructions (this is complex and host-platform-dependent, but will provide a significant performance increase)