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Complete redesign of the CBM610 support.

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Use wrappers to call the kernal in bank 15 instead of implementing kernal
functionality within the cc65 libs (eats performance but is much smaller and
simpler).
Improved startup/shutdown code allows a return to the system bank without
calling the BASIC cold start vector.


git-svn-id: svn://svn.cc65.org/cc65/trunk@2793 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz
2003-12-20 23:13:26 +00:00
parent 018a68a2fe
commit a7042ddbe4
28 changed files with 1086 additions and 1033 deletions
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17
libsrc/cbm610/cbm610-ram.s
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@@ -63,15 +63,20 @@ pagecount: .res 1 ; Number of available pages
INSTALL:
lda #$FF
sta curpage ; Invalidate the current page
sta pagecount ; Assume all memory available
ldx UsrMemTop+2
cpx #RAMBANK ; Top of memory in bank 2?
sec
jsr $FF99 ; MEMTOP
cmp #RAMBANK ; Top of memory in bank 2?
bne @L1 ; No: We can use all the memory
clc
adc UsrMemTop+1
@L1: sta pagecount
txa
sub #OFFS
tya
sbc #$00
sta pagecount
lda #<EM_ERR_OK
@L1: lda #<EM_ERR_OK
ldx #>EM_ERR_OK
; rts ; Run into UNINSTALL instead