VB81 Project

XavSnap Unofficial Release.

UPDATE 28/04/2023



VB81 personal release.


An updated release based on

Chris Cowley's vb81 Version 1.30

Primary designed to had New functionalities in vb81 (screen shot and Zx81 programmers tools...), this release isn't really an Vb81 update, but a Vb81 Toolbox.

But while add-on coding, several peripherals had been implemented and some of partial ZX81 functionalities had been added.

This feature able to use the original VB81 codes, with many Extra-Peripherals to link your emulated ZX81 to the Windows environment.

> > > Help page on VB XuR ... < < <

> > > ZX81's Machine code Help page ... < < <

Download New Release...


Binary files.

VB81 XuR
(You had to install « DskCenter »'s DLLs to launch this  executable file.)




Resource files (VB6 & VB5).

VB81 XuR res.




Runtimes needed while VB XuR launch “exe” file. (VB5 fr)

VB Runtimes



Chris Cowley's original codes and binary are also available at :

Visite official Original VB81 project. (Home page)
Visite official Original VB81 project. (Mirrored page)

Screen shot :

New Feature:

Supported devices :

- Zx Printer : black & white, dithered.

- Memotech Rampack 64kb (8-16kb ram segment), 16kb, 2kb and 1kb.

- Memotech Memo-Calc Rom.

- Memotech HGR Graphic Card.

- G007 Graphic Card.

- QuickSilva HI-RES graphic card.

- QuickSilva UDG graphic card.

- QuickSilva [AY-3] sound card.

- AGB UDG graphic card.

- AGB [AY-3] sound card.

-VTR // Fuller [AY-3] sound card.

-VTR // ZON-x81 [AY-3] sound card.

-VTR -Mageco SPO256-AL2 NARRATOR Speech engine card.

- Larken 5'1/4 disks controller card.
- Mageco 3'1/2 disks controller card.

- Display inverter card.

- 8255 I/O card with Centronics output.

- AGB – Joystick II card.


- An inboard Basic compilator.
Retrive text files (TXT or BAS files) or write a text file using Save «MYPRG.TXT »

- A powerfull file explorer.

- Disassembler/debugger with Rom comments.

- A real-time binary editor.

- A variables viewer.(strings, arrays...)

- A real time UDG creator window.(Software/QuickSilva & AGB cards)

- A type-in tool to change assembler in REMs lines.

- A binary comparator.

- ASM-2 Fast access and in-board viewer/editor.

- Assembler window to import or export ASM mnemonics.

- CBI Fast access.

- A Fig Forth editor et precompilator (ACE Jupiter compatible).

- A « Easy key » window to enter comands, functions and graphics characters.

- An output Wav trigger with 3 kinds of harmonics.

- An input Wav loader (Wav to P files converter).

- An inboard FAST SAVE generator
(Stand-alone in a wav file using SAVE « MYPRG.FL » at Basic prompt)

- “Copy” rom hack (32x24) for the ZxPrinter.

- ASM Breaker (“advanced Break”)

- ASCII & BMP Screen shot. ( 32 & 34 Col.)

- Memory, Basic , D_File tools.

- A picture digitalizer.

- A « Easy Draw » window tool to paint your Zx81's screen.

- A multi-columns generator to print a single page listing (ZxPrinter window).

File explorer:

(Get informations and launch various files formats)


(2 modes: High contrast & dithered)

Setup window:

A commented Disassembler and intelligent Debugger window:

Inboard binary viewer and editor:

Inboard assembler window to import or export ASM2 codes:

A Fig Forth inboard precompiler window :

A Bitmap picture digitalizer window to fill the D_File or generate a Basic File:

An UDG window.

Larken, disassembler, Zxprinter, Wav & variables windows :

A « Easy Draw » window to paint your Zx81's screen :

Special thanks to ...

Chris Cowley author of the VB81 project.

André Baune ( ANDRE*** ) for Larken technicals specifications and ROM.

Kweeky for the Quicksilva & Mageco ROM dump and technicals infos.

Dominique Contant the Fig Forth tester
and his Zx81 editor/compilator reversion.

The Coral Basic Interpreter reversion by Carlos Delhez

Artic Computing and ASM2/CBI's Carlo Delhez reversion.

Memotech for his Memocalc & hardware documentations.

Xavier Arbòs for his ZX81 web site and his support.

Mike D. Wynne for his excellent “Eighty-one” emulator.

(advices, hardware specs and our friendly contest.)

And all Zx81 fans ...

Xavier Martin / XavSnap.