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Text File
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1994-09-04
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1KB
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50 lines
Screen (easy access to vdu stuff)
(C) 1994 George Taylor
Release 1.00
This object does not require any other objects.
In case of difficulty contact the author:
George Taylor
16 Newton Crescent
Dunblane
Perthshire
Scotland
FK15 ODZ
Email: george@tardis.ed.ac.uk
This product is provided in good faith but there is no warranty
with the product.
The author cannot accept any liability for any loss or damage resulting from
the use in any way of this product.
Entry points provided:
0 screen_MaxX
1 screen_MaxY
2 screen_XEig
3 screen_YEig
4 screen_XScale
5 screen_YScale
6 screen_LogBPP
7 screen_BPP
8 screen_LineLength
9 screen_Size
10 screen_ScreenStart
11 screen_DisplayStart
12 screen_NumBanks
13 screen_VDUBank
14 screen_DisplayBank
15 screen_WaitVSync
16 screen_Clear
17 screen_StartCallback
18 screen_ReadSemaphore
All routines can corrupt r0-r3,ip,lr and expect a full descending stack at sp.
Do not call these routines from processor modes other than USR mode.
The 'X' version of all OS calls is used and no errors are returned.