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now sets up SIO command and transfer direction; __sio_call now does the

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real work


git-svn-id: svn://svn.cc65.org/cc65/trunk@361 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cpg 2000-10-12 21:00:19 +00:00
parent bf32739271
commit 3f71fcb293
2 changed files with 12 additions and 76 deletions
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44
libsrc/atari/dioread.s
View File

@ -8,48 +8,16 @@
; _sectnum_t - 16bit
;
.import __sio_call,pushax
.export __dio_read
.import popa,popax
.include "atari.inc"
.proc __dio_read
sta DBUFLO ; set buffer address into DCB
stx DBUFHI
jsr popax
sta DAUX1 ; set sector #
stx DAUX2
jsr popa
cmp #16
bcs _inv_dev ; invalid device #
adc #1
sta DUNIT ; unit number (d1,d2,d3,...)
lda #$31 ; D1 (drive_id == 0) has id $31
sta DDEVIC
lda #0
sta DBYTHI ; high byte of bytes to transfer
lda #%01000000 ; indicate i/o direction (read)
sta DSTATS
lda #15
sta DTIMLO ; value got from DOS source
lda #128
sta DBYTLO ; low byte of bytes to transfer
lda #SIO_READ ; read sector
sta DCOMND
jsr SIOV ; execute
ldx #0
lda DSTATS
bmi _req_err ; error occurred
txa ; no error occurred
_req_err:
rts
_inv_dev:
ldx #0
lda #NONDEV ; non-existent device error
rts
jsr pushax ; push buffer address
ldx #%01000000 ; direction value
lda #SIO_READ ; read sector command
jmp __sio_call ; do the call and return to the user
.endproc

44
libsrc/atari/diowrite.s
View File

@ -8,48 +8,16 @@
; _sectnum_t - 16bit
;
.import __sio_call,pushax
.export __dio_write
.import popa,popax
.include "atari.inc"
.proc __dio_write
sta DBUFLO ; set buffer address into DCB
stx DBUFHI
jsr popax
sta DAUX1 ; set sector #
stx DAUX2
jsr popa
cmp #16
bcs _inv_dev ; invalid device #
adc #1
sta DUNIT ; unit number (d1,d2,d3,...)
lda #$31 ; D1 (drive_id == 0) has id $31
sta DDEVIC
lda #0
sta DBYTHI ; high byte of bytes to transfer
lda #%10000000 ; indicate i/o direction (write)
sta DSTATS
lda #15
sta DTIMLO ; value got from DOS source
lda #128
sta DBYTLO ; low byte of bytes to transfer
lda #SIO_WRITE ; write sector
sta DCOMND
jsr SIOV ; execute
ldx #0
lda DSTATS
bmi _req_err ; error occurred
txa ; no error occurred
_req_err:
rts
_inv_dev:
ldx #0
lda #NONDEV ; non-existent device error
rts
jsr pushax ; push buffer address
ldx #%10000000 ; indicate i/o direction (write)
lda #SIO_WRITE ; write sector command
jmp __sio_call ; do the call and return to the user
.endproc