VNCview GS is a Virtual Network Computing client (viewer) for the Apple IIgs. You can use it to display and interact with the graphical desktop of another computer through your Apple IIgs.
Binary downloads are on the releases page.
A IIgs connected to the network via an Ethernet connection and a server connected to your LAN will probably provide the best performance.
Under Sweet16, there is a known issue where the networking code within Sweet16 may drop the connection to the VNC server. This generally occurs at relatively low emulated speeds; you can usually avoid it by using high or unlimited speed.
To start VNCview GS, simply run the VNCview.GS program. The New VNC Connection dialog box will be displayed, allowing you to configure and start a VNC connection.
Usually, you need to enter the VNC server (using a hostname or IP address and a VNC display number, as in other VNC programs) and a password. Some servers may not require a password, but most do and it is probably advisable to set up your own servers with a password to provide some security. Also note that the VNC display number can be omitted if it is 0, and that it can be negative.
You can select a 320x200 color or 640x200 grayscale display mode. The 320x200 mode better corresponds to the server’s normal display, since it displays colors and uses near-square pixels. 640x200 mode will cause greater distortion and does not display colors, but it does allow a larger portion of the server’s desktop to be displayed on the IIgs.
Other options are also available.
The Preferred Encoding is the method that will be used to represent pixels on the server’s display when sending them to the IIgs; the available options are Raw and Hextile. The Raw encoding sends lines of pixel values to the IIgs, while Hextile represents the display as a collection of small rectangular areas. Raw is generally faster than Hextile in the current version of VNCview GS, but Hextile may be faster on very slow network links. Some servers may not support Hextile encoding, in which case Raw will be used regardless of this setting.
The Tune Marinetti for high throughput option configures Marinetti to process a larger amount of incoming data at once than it does by default. This generally improves performance.
When you have configured your new VNC connection, simply click Connect, and if all goes well you will be connected to the VNC server. You can interact with it with the mouse and keyboard and scroll your view of its display. The option and Open-Apple keys are sent as “meta” and “alt,” respectively; their exact interpretation depends on the server. Keyboard shortcuts for menu items are disabled when connected so that these key combinations can be sent to the server. Select Close or Quit in the File menu when you are done with the connection.
Apple->About VNCview GS…: Displays information about the program
File->New Connection: Allows you to configure and establish a new connection
File->Close: Closes current window or connection. You can connect again afterward.
File->Quit: Quits VNCview GS, closing any open connection
Edit->Undo: Only used by NDAs
Edit->Cut/Copy/Paste/Clear: Used in New VNC Connection window input boxes and NDAs
Edit->Show Clipboard: Displays the current contents of the IIgs clipboard
Edit->Send Clipboard: Transfers the contents of the IIgs clipboard to the server
VNCview GS should be able to connect with any VNC server that fully implements the RFB protocol as defined in RFC 6143 or earlier compatible specifications. Here is a list of some VNC servers; many others are also available.
x11vnc is a good option, because it supports server-side display scaling, which is useful to fit more information on the IIgs screen.
VNCview GS does not work with the Screen Sharing functionality in macOS, because the Screen Sharing server does not support the pixel format that VNCview GS requires. The above servers can be used instead.
Copyright (c) 2002-2016 Stephen Heumann
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This program contains material from the ORCA/C Run-Time Libraries, copyright 1987-1996 by Byte Works, Inc. Used with permission.