Contents |
Effect
Stores in the SRAM of the Real Time Clock (RTC) the parameters corresponding to the COLOR, KEY ON / OFF, SCREEN and WIDTH instructions that will be used each time that you boot the computer.
Syntax
SET SCREEN
Saved parameters
- SCREEN mode: 0 or 1
- Interlace mode: 0 to 3
- WIDTH: 1 to 80
- Foreground color: 1 to 15
- Background color: 1 to 15
- Border color: 1 to 15
- Keylist display: ON or OFF
- Keyclick: ON or OFF
- Printertype: MSX or No MSX (Note: When Arabic BASIC is enabled, this parameter is extended - see SCREEN)
- Cassette writing speed: 1200 or 2400 baud
Remark: If you use SET SCREEN when you are on SCREEN 9, the computer will display the MSX-BASIC screen after booting in SCREEN 9 instead of SCREEN 0 or 1; the parameters of the other screens, especially SCREEN 0 and SCREEN 1, will also be modified.
Storage in the RTC
The Real Time Clock (RTC) is a small storage of 53 bytes in blueMSX (52 bytes in openMSX). It is a little different in blueMSX because this emulator stores an extra setting in #1A, that probably checks if the computer is normally working.
The data saved with SET SCREEN are stored as follows (hexadecimal locations in the files):
- #1E in blueMSX (#1D in openMSX)
| Value | SCREEN | Displaymode |
|---|---|---|
| 00 | 0 | 0, Normal |
| 01 | 1 | 0, Normal |
| 02 | 0 | 1, Interlaced |
| 03 | 1 | 1, Interlaced |
| 04 | 0 | 2, Normal, alternating even/uneven |
| 05 | 1 | 2, Normal, alternating even/uneven |
| 06 | 0 | 3, Interlaced, alternating even/uneven |
| 07 | 1 | 3, Interlaced, alternating even/uneven |
- #1F and #20 in blueMSX (#1E and #1F in openMSX)
These bytes stores the WIDTH value with the formula (16 x value in #20) + value in #1F
Examples:
Width 40 - value 08 in #1F and value 02 in #20 - (16 x 2) + 8 = 40
Width 80 - value 00 in #1F and value 05 in #20 - (16 x 5) + 0 = 80
- #21 in blueMSX (#20 in openMSX)
This byte stores the foreground color (00 to 0F)
- #22 in blueMSX (#21 in openMSX)
This byte stores the background color (00 to 0F)
- #23 in blueMSX (#22 in openMSX)
This byte stores the border color (00 to 0F)
- #24 in blueMSX (#23 in openMSX)
| Value | KEY | Keyclick | Printer | Cassette speed | Value | KEY | Keyclick | Printer | Cassette speed | |
|---|---|---|---|---|---|---|---|---|---|---|
| 00 | OFF | No | MSX | 1200 baud | 08 | OFF | No | MSX | 2400 baud | |
| 01 | ON | No | MSX | 1200 baud | 09 | ON | No | MSX | 2400 baud | |
| 02 | OFF | Yes | MSX | 1200 baud | 0A | OFF | Yes | MSX | 2400 baud | |
| 03 | ON | Yes | MSX | 1200 baud | 0B | ON | Yes | MSX | 2400 baud | |
| 04 | OFF | No | No MSX | 1200 baud | 0C | OFF | No | No MSX | 2400 baud | |
| 05 | ON | No | No MSX | 1200 baud | 0D | ON | No | No MSX | 2400 baud | |
| 06 | OFF | Yes | No MSX | 1200 baud | 0E | OFF | Yes | No MSX | 2400 baud | |
| 07 | ON | Yes | No MSX | 1200 baud | 0F | ON | Yes | No MSX | 2400 baud |
Remark: In Korean Daewoo CPC-300, using a value corresponding to 'No MSX Printer" has as effect to skip the built-in software MSX-TUTOR when booting.
Related to
Compatibility
MSX-BASIC 2.0 or higher