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Format of MultiDOS Plus 4.0 system block

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Offset Size Description

00h

WORD

segment of system control block

02h

WORD

redirection flag set by /NOREDIRECT

04h

WORD

no-INT 10 flag set by /NO10

06h

DWORD

old INT 10

0Ah

DWORD

new INT 10

0Eh

DWORD

pointer to WORD with current TCB offset (see #00456)

12h

DWORD

pointer to WORD with idle task TCB offset

16h

DWORD

pointer to WORD with foreground TCB offset (see #00456)

1Ah

DWORD

pointer to WORD with MultiDOS TCB offset (see #00456)

1Eh

WORD

Task Control Block size

20h

WORD

number of TCBs

22h

WORD

flag: EMS present

24h

WORD

EMS page frame base segment

26h

WORD

16K pages in EMS page frame

28h

WORD

base segment for conventional memory tasks

2Ah

WORD

conventional memory size in paragraphs

2Ch

DWORD

pointer to list of queue pointers