RISC OS Open
A fast and easily customised operating system for ARM devices
ROOL
Home | News | Downloads | Bugs | Bounties | Forum | Documents | Photos | Contact us
Account

OS_ReadVduVariables

OS SWI Calls
» OS_ReadVduVariables

OS_ReadVduVariables

(SWI &31)
Entry
R0 Pointer to input block
R1 Pointer to output block (can be the same as R0)
Exit
R0 Preserved
R1 Preserved

Use

The purpose of this call is to read a series of VDU variables.

Notes

The input block is a list of VDU variable numbers (words) terminated by -1. Each variable is read, and its value is written as a word into the output block.

Note: You can also read the mode variables with this call.

See also

  • Mode Variable Numbers
  • VDU Variables
Revised on November 12, 2017 08:27:03 by Alan Robertson (52) (49.192.18.196)
Edit | Back in time (1 revision) | See changes | History | Views: Print | Source | Linked from: Mode Variable Numbers, OS SWI Calls, OS_Byte 160, GCOL OR and EOR Address, OS_Word 13, OS_ReadModeVariable, WindowManager Mode Independence, OS_Byte 160 VDU Variable Numbers, UKPLOTV, VDU Variables, OS_Word 13 Buffer, OS SWI Calls (français)

Search the Wiki

Social

Follow us on and

ROOL Store

Buy RISC OS Open merchandise here, including SD cards for Raspberry Pi and more.

Donate! Why?

Help ROOL make things happen – please consider donating!

RISC OS IPR

RISC OS is an Open Source operating system owned by RISC OS Developments Ltd and licensed primarily under the Apache 2.0 license.

Navigation

  • Home Page
  • All Pages
  • Recently Revised
  • Authors
  • Feeds
Site design © RISC OS Open Limited 2018 except where indicated
The RISC OS Open Instiki theme is based on Insitki's default layout

Valid XHTML 1.0  |  Valid CSS

Instiki 0.19.1(MML+)
This site runs on Rails

Hosted by Arachsys