Difference between revisions of "OSWORD"
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of parameters to receive in the second byte of the parameter block, | of parameters to receive in the second byte of the parameter block, | ||
inclusive of the first two bytes. | inclusive of the first two bytes. | ||
| + | |||
| + | OSWORD calls with numbers &E0 to &FF are "available for use by the user".<ref | ||
| + | name="sadek">R.I.M. Sadek (1986), | ||
| + | ''The complete disc manual for the BBC Microcomputer'', Macmillan Education | ||
| + | Ltd. p.107.</ref> They are indirected via [[USERV]] on the 6502 I/O | ||
| + | processor.<ref name="sadek" /><ref name="appnote-004">Acorn Computers (June | ||
| + | 1992), ''Application note 004: Tube application note'', p.5.</ref> | ||
==Calling from BBC BASIC== | ==Calling from BBC BASIC== | ||
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* http://mdfs.net/Docs/Comp/BBC/Oswords | * http://mdfs.net/Docs/Comp/BBC/Oswords | ||
* http://mdfs.net/Docs/Comp/BBC/Osword | * http://mdfs.net/Docs/Comp/BBC/Osword | ||
| + | |||
| + | ==References== | ||
| + | <references /> | ||
[[User:Jgharston|Jgharston]] 17:03, 6 November 2009 (UTC) | [[User:Jgharston|Jgharston]] 17:03, 6 November 2009 (UTC) | ||
Revision as of 16:54, 10 April 2020
Miscellaneous actions with a control block
Specification
| 6502 | Z80 | 6809 | PDP11 | 80x86 | 32016 | ARM | On entry: | On exit: |
| A | A | A | R0 | AL | R1 | R0 | = function code | undefined |
| XY | HL | X | R1 | BX | R2 | R1 | =>control block | undefined, control block updated |
| Control block for calls>&7F | ||||||||
| &00 | Length of sent control block | |||||||
| &01 | Length of received control block | |||||||
| &02... | Any other parameters | |||||||
OSWORD &00 is the only call that is allowed to return data in registers. All other calls return data in the control block.
OSWORD calls with numbers greater than &7F should contain the number of parameters to send in the first byte of the parameter block, and the number of parameters to receive in the second byte of the parameter block, inclusive of the first two bytes.
OSWORD calls with numbers &E0 to &FF are "available for use by the user".[1] They are indirected via USERV on the 6502 I/O processor.[1][2]
Calling from BBC BASIC
-
INPUTcalls OSWORD &00 -
=TIMEcalls OSWORD &01 -
TIME=calls OSWORD &02 -
SOUNDcalls OSWORD &07 -
ENVELOPEcalls OSWORD &08 -
=POINTcalls OSWORD &09 -
=TIME$calls OSWORD &0E -
TIME$=calls OSWORD &0F
Entry points
- BBC BASIC Entry Address: &FFF1
- 6502 Entry Address: &FFF1, vectors via &020C
- Z80 Entry Address: &FFF1, vectors via &FFF2
- 6809 Entry Address: &FFF1, vectors via &FFF2
- 80x86 Entry Address: INT &4A, vectors via &0000:0128
- 32000 Entry Address: SVC &07
- PDP-11 Entry Address: EMT 3, vector &03
- ARM Entry Address: SWI &07 "OS_Word", vector &07
See Also
References
Jgharston 17:03, 6 November 2009 (UTC)
