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Dirk Jagdmann 2020-06-17 15:42:37 -07:00 committed by Oliver Schmidt
parent ba79b2db9b
commit 070264acc4
1 changed files with 31 additions and 31 deletions
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62
libsrc/c64/emd/c64-kerberos.s
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@ -52,44 +52,44 @@ RAMC_PAGE_HI = $DE3F ; Page register high
;
INSTALL:
;; write $55 into first page
lda #0
sta RAMC_PAGE_LO
sta RAMC_PAGE_HI
lda #$55
sta RAMC_WINDOW
;; write $55 into first page
lda #0
sta RAMC_PAGE_LO
sta RAMC_PAGE_HI
lda #$55
sta RAMC_WINDOW
;; write $AA into second page
lda #1
sta RAMC_PAGE_LO
sta RAMC_PAGE_HI
lda #$AA
sta RAMC_WINDOW
;; write $AA into second page
lda #1
sta RAMC_PAGE_LO
sta RAMC_PAGE_HI
lda #$AA
sta RAMC_WINDOW
;; check $55 in first page
lda #0
sta RAMC_PAGE_LO
sta RAMC_PAGE_HI
lda RAMC_WINDOW
cmp #$55
bne @notpresent
;; check $55 in first page
lda #0
sta RAMC_PAGE_LO
sta RAMC_PAGE_HI
lda RAMC_WINDOW
cmp #$55
bne @notpresent
;; check $AA in first page
lda #1
sta RAMC_PAGE_LO
sta RAMC_PAGE_HI
lda RAMC_WINDOW
cmp #$AA
bne @notpresent
;; check $AA in first page
lda #1
sta RAMC_PAGE_LO
sta RAMC_PAGE_HI
lda RAMC_WINDOW
cmp #$AA
bne @notpresent
lda #<EM_ERR_OK
lda #<EM_ERR_OK
ldx #>EM_ERR_OK
rts
rts
@notpresent:
lda #<EM_ERR_NO_DEVICE
ldx #>EM_ERR_NO_DEVICE
; use rts from UNINSTALL below
; use rts from UNINSTALL below
; ------------------------------------------------------------------------
; UNINSTALL routine. Is called before the driver is removed from memory.
@ -122,8 +122,8 @@ USE = MAP
;
MAP: sta RAMC_PAGE_LO
txa
and #1
txa
and #1
sta RAMC_PAGE_HI
lda #<RAMC_WINDOW
ldx #>RAMC_WINDOW