SS.AScrn_Set_Status modified by Lothan

Lothan — Fri, 27 Jun 2014 23:20:18 -0000

Allocates and maps a high-resolution screen into an application address space.

Entry Conditions

A
path number

B
SS.AScrn ($8B)

X
screen type

0 = 640 x 192 x 2 colors (16K)

1 = 320 x 192 x 4 colors (16K)

2 = 160 x 192 x 16 colors (16K)

3 = 640 x 192 x 4 colors (32K)

4 = 320 x 192 x 16 colors (32K)

Exit Conditions

X
application address space of screen

Y
screen number (1-3)

Error Output

CC
carry set on error

B
error code

Additional Information

SS.AScrn is particularly useful in systems with mininal memory when you want to allocate a high resolution graphics screen with all screen updating handled by a process.
All screens are allocated in multiples of 8K blocks. You can allocate a maximum of three buffers at one time. To select between buffers, use the SS.DScrn SetStat call.
Screen memory is allocated but not cleared. The application using the screen must do this.
Screens must be allocated from a VDG-type device—a standard 32-column text screen must be available for the device.
This call uses VDGInt (GrfInt is not required).
The support module for this call is VDGInt.

Recent changes to SS.AScrn_Set_Status