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Compute SmartPort unit numbers more sensibly. Fixes #100

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This commit is contained in:
Joshua Bell 2018-12-29 10:23:33 -08:00
parent 2bfb2cd443
commit 3a128da01d
1 changed files with 34 additions and 32 deletions
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66
desktop/desktop_main.s
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@ -767,21 +767,7 @@ check_disk_in_drive:
lda unit_number
jsr find_smartport_dispatch_address
bne notsp ; not SmartPort
;; Compute smart port control unit number
lda unit_number
pha
rol a
pla
php
and #$20
lsr a
lsr a
lsr a
lsr a
plp
adc #1
sta status_unit_num
stx status_unit_num
;; Execute SmartPort call
jsr smartport_call
@ -9903,21 +9889,7 @@ found: lda DEVLST,y ;
smartport_addr := $0A
jsr find_smartport_dispatch_address
bne exit ; not SP
;; Compute control_unit_number from unit_number
lda unit_number
pha
rol a
pla
php
and #$20
lsr a
lsr a
lsr a
lsr a
plp
adc #1
sta control_unit_number
stx control_unit_number
;; Execute SmartPort call
jsr smartport_call
@ -9984,14 +9956,19 @@ L92E6: .byte 0
;;; ============================================================
;;; Look up SmartPort dispatch address.
;;; Input: A = unit number
;;; Output: Z set if SP, $0A/$0B dispatch address; Z clear if not SP
;;; Output: Z=1 if SP, $0A/$0B dispatch address, X = SP unit num
;;; Z=0 if not SP
.proc find_smartport_dispatch_address
sp_addr := $0A
sta unit_number ; DSSSnnnn
;; Get device driver address
jsr device_driver_address
bne exit ; RAM-based driver
;; Find actual address
copy #0, sp_addr ; point at $Cn00 for firmware lookups
ldy #$07 ; SmartPort signature byte ($Cn07)
@ -10010,9 +9987,34 @@ L92E6: .byte 0
adc #3
sta sp_addr
lda #0 ; exit with Z set on success
;; Figure out SmartPort control unit number in X
ldx #1 ; start with unit 1
bit unit_number ; high bit is D
bpl :+
inx ; X = 1 or 2 (for Drive 1 or 2)
: lda unit_number
and #%01110000 ; 0SSSnnnn
lsr
lsr
lsr
lsr
sta mapped_slot ; 00000SSS
lda sp_addr+1 ; $Cn
and #%00001111 ; $0n
cmp mapped_slot ; equal = not remapped
beq :+
inx ; now X = 3 or 4
inx
: lda #0 ; exit with Z set on success
exit: rts
unit_number:
.byte 0
mapped_slot: ; from unit_number, not driver
.byte 0
.endproc
;;; ============================================================