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BuhBye: Cycle through volumes after the boot volume more intuitively

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Previously, the boot volume was shown first, but then tab would cycle
from the highest priority volume to the lowest. This would be awkward
if the boot volume was not the highest priority volume. For example,
with these devices (listed lowest to highest priority, like DEVLST),
/HD1 is the boot volume but the RAM disks are highest priority:

(low) /FLOPPY2 /FLOPPY1 /HD4 /HD3 /HD2 /HD1 /RAMWORKS /RAM (high)

Prior to this fix, it would cycle:

/HD1 /RAM /RAMWORKS /HD1 /HD2 /HD3 /HD4 /FLOPPY1 /FLOPPY2 /RAM ...

After this fix, it will cycle:

/HD1 /HD2 /HD3 /HD4 /FLOPPY1 /FLOPPY2 /RAM /RAMWORKS /HD1 ...

To fit, a little bit of code golfing was necessary.
This commit is contained in:
Joshua Bell 2022-09-01 20:38:07 -07:00
parent 145aba1f66
commit 9590bc4b9e
1 changed files with 21 additions and 20 deletions
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41
selectors/buhbye.system.s
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@ -100,7 +100,7 @@ loop: lda (src_ptr) ; *src_ptr = *dst_ptr
read_buffer := $2000 ; Also, start location for launched SYS files
;; Device/Prefix enumeration
next_device_num := $65 ; next device number to try
cur_device_num := $65 ; device number to try
prefix_depth := $6B ; 0 = root
;; Directory enumeration
@ -146,22 +146,23 @@ loop: lda (src_ptr) ; *src_ptr = *dst_ptr
sta BITMAP
;; Find device
lda DEVCNT ; max device num
sta next_device_num
lda DEVNUM
bne check_device
ldx DEVCNT
: lda DEVLST,x
and #%11110000
cmp DEVNUM
beq check_device
dex
bra :-
next_device:
ldx next_device_num
lda DEVLST,x
cpx #1
bcs :+
ldx cur_device_num
dex
bpl :+
ldx DEVCNT
inx
: dex
stx next_device_num
: lda DEVLST,x
check_device:
stx cur_device_num
sta on_line_params_unit
MLI_CALL ON_LINE, on_line_params
bcs next_device
@ -256,9 +257,9 @@ store_entry:
sta (curr_ptr),y
dey
bpl :-
iny ; Y = 0; storage_type/name_length in A
; storage_type/name_length in A
and #%00001111 ; mask off name_length (remove storage_type)
sta (curr_ptr),y ; store length
sta (curr_ptr) ; store length
inc num_entries
@ -300,9 +301,9 @@ next_in_block:
lda entry_pointer
adc entry_length
sta entry_pointer
lda entry_pointer+1
adc #0
sta entry_pointer+1
bcc :+
inc entry_pointer+1
:
inc block_entries
@ -568,9 +569,9 @@ loop: lda help_string,y
clc
adc curr_ptr+1
sta curr_ptr+1
ldy #0
lda (curr_ptr),y
lda (curr_ptr)
sta curr_len
ldy #0 ; needed by caller
;; fall through
.endproc
@ -691,7 +692,7 @@ cout: jmp COUT
;;; ------------------------------------------------------------
.endproc
.assert .sizeof(selector) <= max_size, error, "Must fit in $300 bytes"
.assert .sizeof(selector) <= max_size, error, .sprintf("Must fit in $300 bytes, is: $%x", .sizeof(selector))
install_size = .sizeof(selector)
poporg