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DeskTop: notes about unit numbers

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This commit is contained in:
Joshua Bell 2018-01-18 09:32:25 -08:00
parent e310fbfed8
commit 426f493612
2 changed files with 20 additions and 9 deletions
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19
desktop/desktop.s
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@ -13817,7 +13817,7 @@ buffer: .addr $800
.endproc
.proc get_device_info
sta device_id
sta unit_number
sty device_num
and #$F0
sta on_line_params::unit
@ -13875,19 +13875,21 @@ L8A22: lda $0801,x
adc #$02
sta ($06),y
lda device_id
lda unit_number
cmp #$3E ; ??? Special case? Maybe RamWorks?
beq use_ramdisk_icon
and #$0F ; lower nibble
cmp #4 ; 0 = Disk II, 4 = ProFile, $F = /RAM
cmp #DT_PROFILE ; ProFile or Slinky-style RAM ?
bne use_floppy_icon
;; BUG: This defaults SmartPort hard drives to use floppy icons.
;; https://github.com/inexorabletash/a2d/issues/6
;; See https://github.com/inexorabletash/a2d/issues/6 for more
;; context; this code is basically unsalvageable per ProDOS
;; Tech Note #21.
;; Either ProFile or a "Slinky"/RamFactor-style Disk
lda device_id ; bit 7 = drive (0=1, 1=2); 5-7 = slot
lda unit_number ; bit 7 = drive (0=1, 1=2); 5-7 = slot
and #%01110000 ; mask off slot
lsr a
lsr a
@ -13920,7 +13922,7 @@ use_profile_icon:
jmp selected_device_icon
use_floppy_icon:
cmp #$B ; SmartPort device ???
cmp #$B ; removable / 4 volumes
bne use_floppy140_icon
ldy #7
lda #<desktop_aux::floppy800_icon
@ -13931,7 +13933,7 @@ use_floppy_icon:
jmp selected_device_icon
use_floppy140_icon:
cmp #0 ; 0 = Disk II
cmp #DT_DISKII ; 0 = Disk II
bne use_profile_icon ; last chance
ldy #7
lda #<desktop_aux::floppy140_icon
@ -13966,7 +13968,7 @@ L8AA7: lda L8AC5,x
rts
.endproc
device_id: .byte 0
unit_number: .byte 0
device_num: .byte 0
L8AC5: .byte $00,$00,$00,$00,$EA,$01,$10,$00
@ -19537,6 +19539,7 @@ done_machine_id:
bpl :-
ldx DEVCNT
: lda DEVLST,x
;; BUG: ProDOS Tech Note #21 says $B3,$B7,$BB or $BF could be /RAM
cmp #(1<<7 | 3<<4 | DT_RAM) ; unit_num for /RAM is Slot 3, Drive 2
beq found_ram
dex

10
inc/prodos.inc
View File

@ -56,12 +56,20 @@ READ_BLOCK := $80
WRITE_BLOCK := $81
;;; ------------------------------------------------------------
;;; Device Types
;;; Device Types (low nibble of unit number in DEVLST)
DT_DISKII := $0
DT_PROFILE := $4
DT_RAM := $F
;;; See ProDOS Tech Note #21 - other than the above types, there
;;; is not an "ID nibble". The nibble is a copy of $CnFE's high
;;; nibble, with this meaning:
;;; bit 3 = removable
;;; bit 2 = interruptable
;;; bit 1-0 = number of volumes (0-1)
;;; "You should ignore the low nibble in the unit number..."
;;; ------------------------------------------------------------
;;; File Types