Motorola M68000 User's Guide download pdf (Page 233)

Appendix B 219

**********************************************

Amiga shell - This must run under the CLI

Link with amiga.lib

* You may have to modify the following include if your

* include files are not in the same directory.

include ";include/libraries/dos_lib.i"

code

* External references

xref _AbsExecBase

xref _LVOOpenLibrary

xref _LVOCloseLibrary

* Initialization code to open the DOS library and the console device

lea DOSName,Al

get name of dos library

clr.l

and latest version

movea.1

_AbsExecBase,a6

get base of exec

jsr

_LVOOpenLibrary(a6)

open dos library

move. 1

dO, DOSBase

save base address

move.1

#1006,d2

new file

move.1

#con,dl

get console name

movea.1

JDOSBase,a6

dos lib base to a6

jsr

_LVOOpen<a6)

open console

move.1

dO,console

save file pointer

Your program goes here

Code to clean up and exit to the CLI

fini: move.l console,dl

movea.l _D0SBase,a6

jsr _LV0Close(a6)

movea.l _DOSBase,al

movea.l _AbsExecBase,a6

jsr _LVOCloseLibrary(a6)

clr.l dO

rts

* Standard I/O subroutines

getc: movem.l dl-d7/a0-a6,-(sp)

move.l console,dl

move.l #buff,d2

moveq.l #l,d3

movea.l _D0SBase,a6

jsr _LVORead(a6)

clr.l dO

move.b buff,d0

movem.l (sp)+,dl-d7/a0-a6

get file pointer

dos lib base to a6

close console

dos lib base to al

exec base to a6

close dos library

indicate no error

return to cli

save regs.

file pointer to dl

buffer pointer to d2

count to d3

dos lib base to a6

read data

make sure high order bits clear

get the char,

restore regs.

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Motorola M68000 User's Guide Page 233

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