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Format of Amstrad NVRAM

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Offset Size Description

00h

BYTE

time of day: seconds

01h

BYTE

alarm time: seconds

02h

BYTE

time of day: minutes

03h

BYTE

alarm time: minutes

04h

BYTE

time of day: hours

05h

BYTE

alarm time: hours

06h

BYTE

day of week
1 = Sunday
2 = Monday
3 = Tuesday
4 = Wednesday
5 = Thursday
6 = Friday
7 = Saturday

07h

BYTE

day of month

08h

BYTE

month

09h

BYTE

year mod 100

0Ah

BYTE

RTC status register A (see #00406)

0Bh

BYTE

RTC status register B (see #00407)

0Ch

BYTE

RTC status register C (read-only) (see #00408)

0Dh

BYTE

RTC status register D
bit 7 : battery good

0Eh

6 BYTEs

time and date machine last used

14h

BYTE

user RAM checksum

15h

WORD

Enter key scancode/ASCII code

17h

WORD

Forward delete key scancode/ASCII code

19h

WORD

Joystick fire button 1 scancode/ASCII code

1Bh

WORD

Joystick fire button 2 scancode/ASCII code

1Dh

WORD

mouse button 1 scancode/ASCII code

1Fh

WORD

mouse button 2 scancode/ASCII code

21h

BYTE

mouse X scaling factor

22h

BYTE

mouse Y scaling factor

23h

BYTE

initial VDU mode and drive count

24h

BYTE

initial VDU character attribute

25h

BYTE

size of RAM disk in 2K blocks

26h

BYTE

initial system UART setup byte

27h

BYTE

initial external UART setup byte

28h

24 BYTEs

available for user application

Note:

Bytes 00h-0Dh are the same on the IBM AT as they are used/updated by the clock chip.