242 lines
13 KiB
HTML
242 lines
13 KiB
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<TITLE>Int 15/AH=01h
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<META NAME="Description" CONTENT="
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Int 15/AH=01h - Amstrad PC1512 - WRITE DATA TO NON-VOLATILE RAM -
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AH = 01h
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AL = NVRAM location (00h to 3Fh) (see #00405)
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BL = NVRAM data value
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Return: AH = return code
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00h OK
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01h address bad
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02h write error
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SeeAlso: AH=02hAmstrad
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Format of Amstrad NVRAM:
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<h2>Int 15/AH=01h
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<h3><font color=#C00040>Amstrad PC1512 - WRITE DATA TO NON-VOLATILE RAM</font></h3>
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<PRE>
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AH = 01h
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AL = NVRAM location (00h to 3Fh) <a href="rb-1146.htm#Table405" tppabs="http://www.ctyme.com/intr/rb-1146.htm#Table405">(see #00405)</a>
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BL = NVRAM data value<br>
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<p><b>Return:</b><br>AH = return code
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00h OK
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01h address bad
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02h write error
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</PRE>
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<p><b>See Also:</b>
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<a href="rb-1150.htm" tppabs="http://www.ctyme.com/intr/rb-1150.htm">AH=02h"Amstrad"</a>
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<PRE>
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<p>
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Format of Amstrad NVRAM:
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<a name=table405></a>
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Offset Size Description (Table 00405)
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<p><b>00h BYTE time of day:</b><br>Seconds
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<p><b>01h BYTE alarm time:</b><br>Seconds
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<p><b>02h BYTE time of day:</b><br>Minutes
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<p><b>03h BYTE alarm time:</b><br>Minutes
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<p><b>04h BYTE time of day:</b><br>Hours
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<p><b>05h BYTE alarm time:</b><br>Hours
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06h BYTE day of week, 1 = Sunday
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07h BYTE day of month
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08h BYTE month
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09h BYTE year mod 100
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0Ah BYTE RTC status register A <a href="rb-1146.htm#Table406" tppabs="http://www.ctyme.com/intr/rb-1146.htm#Table406">(see #00406)</a>
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0Bh BYTE RTC status register B <a href="rb-1146.htm#Table407" tppabs="http://www.ctyme.com/intr/rb-1146.htm#Table407">(see #00407)</a>
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0Ch BYTE RTC status register C (read-only) <a href="rb-1146.htm#Table408" tppabs="http://www.ctyme.com/intr/rb-1146.htm#Table408">(see #00408)</a>
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0Dh BYTE RTC status register D
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<p><b>bit 7:</b><br>Battery good
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0Eh 6 BYTEs time and date machine last used
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14h BYTE user RAM checksum
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15h WORD Enter key scancode/ASCII code
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17h WORD Forward delete key scancode/ASCII code
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19h WORD Joystick fire button 1 scancode/ASCII code
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1Bh WORD Joystick fire button 2 scancode/ASCII code
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1Dh WORD mouse button 1 scancode/ASCII code
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1Fh WORD mouse button 2 scancode/ASCII code
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21h BYTE mouse X scaling factor
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22h BYTE mouse Y scaling factor
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23h BYTE initial VDU mode and drive count
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24h BYTE initial VDU character attribute
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25h BYTE size of RAM disk in 2K blocks
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26h BYTE initial system UART setup byte
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27h BYTE initial external UART setup byte
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28h 24 BYTEs available for user application
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</PRE>
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<p><b>Note:</b>
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Bytes 00h-0Dh are the same on the IBM AT as they are used/updated by
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the clock chip
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<PRE>
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<p>
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Bitfields for RTC status register A:
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<a name=table406></a>
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Bit(s) Description (Table 00406)
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7 set if date/time being updated
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6-4 time base speed, default 010 = 32768 Hz
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3-0 interrupt rate selection, default 0110 = 1024 Hz
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</PRE>
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<p><b>See Also:</b>
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#00405
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<PRE>
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<p>
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Bitfields for RTC status register B:
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<a name=table407></a>
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Bit(s) Description (Table 00407)
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7 clear if normal update, set if abort update
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6 periodic interrupt enable
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5 alarm interrupt enable
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4 update end interrupt enable
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3 square wave enable
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2 date mode (clear = BCD, set = binary)
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1 24-hour format
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0 daylight saving time enable
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</PRE>
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<p><b>See Also:</b>
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#00405
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<PRE>
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<p>
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Bitfields for RTC status register C:
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<a name=table408></a>
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Bit(s) Description (Table 00408)
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7 IRQF flag
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6 PF flag
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5 AF flag
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4 UF flag
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</PRE>
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<p><b>See Also:</b>
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#00405
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<p>
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<b>Category: <a href="cat-044.htm" tppabs="http://www.ctyme.com/intr/cat-044.htm">
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Vendor-specific BIOS Extensions</a>
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Int 15h</a>
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