View source for VSV21 Graphic System

The '''VSV21 Graphic System''' is a single-module [[DEC card form factor|quad]] size option for the [[QBUS#Variable address size|Q22]] [[QBUS]]. It is a high functionality graphics control module capable of working on the following processors:

* [[PDP-11/23+]]
* [[PDP-11/53]]
* [[PDP-11/73]]
* [[PDP-11/83]]
* [[MicroVAX II]]

It is capable of interfacing with:

* A color [[video display|monitor]], e.g. a [[VR241]]
* An [[LK201]] [[keyboard]]
* A pointing device ([[joystick]], trackball, [[mouse]], tablet)
* A [[serial interface]] (example [[DHV11]])

The display resolution is settable via switches on the module to one of:

* 640 x 480
* 640 x 240
* 512 x 512
* 512 x 256

The VSV21 has got [[operating system]] support from:
* [[RSX-11M-PLUS]]
* [[Micro/RSX]]
* [[MicroVMS]] resp. [[VMS]]

When the VSV21 is interfaced to the host processor via its serial interface, it can be configured to emulate a basic [[terminal]]. In this configuration the Q22 bus interface is not used, and the VSV21 can be used as the host console terminal.

The VSV21 is provided with [[VSV11 Graphic System|VSV11]] emulation software which enables it to run applications that have been developed for the [[VS11]] and VSV11 systems. 
The VSV21 can emulate a minimum-configuration single-channel VSV11 system. 
The VSV11 emulation software supports the following VS11/VSV11 features:

* [[QIO]] format, identical to the VS11
* Main and auxiliary display lists
* The [[FORTRAN]] Draw package
* Joystick control

These features allow most VS11/VSV11 applications to run on the VSV21 without modification or recompilation.

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==See also==

* [[VSV11 Graphic System]]
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==Further reading==
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==External links==

* [http://mim.stupi.net/manuals/layered/vsv4.pdf VSV21 Version 2.0 User Guide] (AZ-FV70B-TC)
* [http://mim.stupi.net/manuals/layered/vsv5.pdf VSV21 Version 2.0 Programmer's Guide] (AA-FV67B-TC)
* [http://mim.stupi.net/manuals/layered/vsv6.pdf VSV21 Programmer's Guide Addendum] (AD-FV67B-T1)
* [http://mim.stupi.net/manuals/layered/vsv2.pdf VSV21 Version 2.0 Installation Manual] (AZ-FV71B-TC)
* [http://mim.stupi.net/manuals/layered/vsv3.pdf VSV21 Version 2.0 Software Installation Guide] (AA-FV66B-TC)
* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/EK-VSV21-UM-001%20VSV21%20Peripheral%20Concentrator%20User-Installation%20Guide.pdf VSV21 Peripheral Concentrator User/Installation Guide] (EK-VSV21-UM-00l)
* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/EK-VSV21-PSG-003%20VSV21%20Version%202.0%20Pocket%20Service%20Guide.pdf VSV21 Version 2.0 Pocket Service Guide] (EK-VSV21-PSG-003)

[[Category: QBUS Display Controllers]]