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small tape code optimization

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FeralChild64 committed 2020-01-30 22:37:42 +01:00
1 parent 64face2b03
commit f104746ebc
4 files changed
+16 -31
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c64/kernal/banking/mega65_imports.s
-7
View File
@@ -55,10 +55,3 @@
.label tape_normal_byte_store = KERNAL_0.tape_normal_byte_store
#endif
#if CONFIG_TAPE_TURBO
.label tape_turbo_byte_store = KERNAL_0.tape_turbo_byte_store
#endif
c64/kernal/tape/load_tape_turbo.s
-4
View File
@@ -128,11 +128,7 @@ load_tape_turbo_payload:
load_tape_turbo_loop:
jsr tape_turbo_get_byte
#if ROM_LAYOUT_M65
jsr tape_turbo_byte_store
#else
jsr __tape_turbo_bytestore // like 'sta (MEMUSS),y' - but under I/O
#endif
eor PRTY // handle checksum
sta PRTY
c64/kernal/tape/tape_turbo_byte_store_mega65.s
-19
View File
@@ -1,19 +0,0 @@
// #LAYOUT# M65 KERNAL_0 #TAKE
// #LAYOUT# * * #IGNORE
//
// Tape (turbo) helper routine - byte storage when ban changing is needed
//
#if CONFIG_TAPE_TURBO
tape_turbo_byte_store:
jsr map_NORMAL
jsr __tape_turbo_bytestore // like 'sta (MEMUSS),y' - but under I/O
jmp map_KERNAL_1
#endif
c64/kernal/tape/tape_turbo_bytestore.s
+16 -1
View File
@@ -5,8 +5,10 @@
//
// Tape (turbo) helper routine - storing byte uder I/O
//
// Has to preserve .A and .Y
//
// This helper routine is meant to be copiet to the start of CPU stack.
// This helper routine is meant to be copied to the start of CPU stack.
// Original ROM tape loading routines uses this area to store information
// about bytes that did not read properly for the first time
// (see Mapping the C64, page 47); this mechanism is useless for turbo tape,
@@ -16,12 +18,20 @@
#if CONFIG_TAPE_TURBO
#if ROM_LAYOUT_M65
.label __tape_turbo_bytestore_defmap = __tape_turbo_bytestore + 10
#else
.label __tape_turbo_bytestore_defmap = __tape_turbo_bytestore + 7
#endif
.label __tape_turbo_bytestore_size = __tape_turbo_bytestore_source_end - tape_turbo_bytestore_source
tape_turbo_bytestore_source:
#if ROM_LAYOUT_M65
jsr KERNAL_0.map_NORMAL
#endif
// Set all memory as RAM, tape motor ON
ldx #$00
stx CPU_R6510
@@ -33,8 +43,13 @@ tape_turbo_bytestore_source:
ldx #$00 // value will be determined later, offset from start: 7 bytes
stx CPU_R6510
#if ROM_LAYOUT_M65
// Restore default map and quit
jmp KERNAL_0.map_KERNAL_1
#else
// Go back
rts
#endif
__tape_turbo_bytestore_source_end: