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Format of PCSpool control block

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Offset Size Description

00h

WORD

printer number

02h

WORD

address of printer status port

04h

WORD

number of first record in queue

06h

WORD

number of last record in queue

08h

DWORD

characters already printed

0Ch

DWORD

number of characters remaining

10h

DWORD

pointer to dequeue buffer

14h

DWORD

previous count of characters printed

18h

DWORD

number of clock ticks taken to print them

1Ch

WORD

offset of next character to output

1Eh

WORD

offset of next character to print

20h

WORD

pointer to spooling queue record

22h

BYTE

current spooling status

23h

BYTE

current printer status:
00h - OK
01h - not ready
02h - paused with message
03h - paused
04h - initializing
FEh - non-existent port
FFh - not spooled

24h

BYTE

current control record type

25h

WORD

observed printer speed

27h

WORD

characters to print per service

29h

BYTE

01h if disk write needed

2Ah

BYTE

01h if queued data should be flushed

2Bh

BYTE

01h to update cps status