VB81 XuR (13/05/27) is released. VB81 XuR is the ZX81 emulator.

VB81 XuR (13/05/27) Changelog:
- AY-3-8912 sound card added:(from Chris Cowley's VBSPEC sources)
* VTR // Zon-X.[I/O &FD;&0F]
* QuickSilva. [POKE &7FFE-FF]
* AGB. [I/O &00;&02]

Download: VB81 XuR (13/05/27)
Source: Here