6502/cc65
1
0
Fork 0
mirror of https://github.com/cc65/cc65.git synced 2025-01-22 21:32:57 +00:00
Code Issues Projects Releases Wiki Activity

Don't check firmware at $C200, as we don't use it

Browse Source 
Just check that we're on a IIgs instead.
This commit is contained in:
Colin Leroy-Mira 2023-10-10 21:17:44 +02:00 committed by Oliver Schmidt
parent 9e87e558d2
commit 65ce3a6792
1 changed files with 12 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
libsrc/apple2/ser/a2.gs.s
View File

@ -67,7 +67,7 @@ SendBuf: .res 256 ; Send buffers: 256 bytes
.data
Slot: .byte $00 ; 2 when opened
Opened: .byte $00 ; 1 when opened
Channel: .byte $00 ; Channel B by default
CurChanIrqFlags:.byte INTR_PENDING_RX_EXT_B
@ -138,25 +138,9 @@ ParityTable: .byte %00000000 ; SER_PAR_NONE, in WR_TX_RX_CTRL (WR4)
.byte $FF ; SER_PAR_MARK
.byte $FF ; SER_PAR_SPACE
IdOfsTable: .byte $00 ; First firmware instruction
.byte $05 ; Pascal 1.0 ID byte
.byte $07 ; Pascal 1.0 ID byte
.byte $0B ; Pascal 1.1 generic signature byte
.byte $0C ; Device signature byte
IdValTable: .byte $E2 ; SEP instruction
.byte $38 ; Fixed
.byte $18 ; Fixed
.byte $01 ; Fixed
.byte $31 ; Serial or parallel I/O card type 1
IdTableLen = * - IdValTable
; ------------------------------------------------------------------------
; Addresses
ZILOG_BASE := $C200
SCCAREG := $C039
SCCBREG := $C038
SCCADATA := $C03B
@ -286,7 +270,7 @@ WriteAreg:
SER_INSTALL:
SER_UNINSTALL:
SER_CLOSE:
ldx Slot ; Check for open port
ldx Opened ; Check for open port
beq :+
ldx Channel
@ -318,7 +302,7 @@ SER_CLOSE:
jsr writeSCCReg
ldx #$00
stx Slot ; Mark port as closed
stx Opened ; Mark port as closed
cli
: txa
@ -329,28 +313,22 @@ SER_CLOSE:
; Must return an SER_ERR_xx code in a/x.
SER_OPEN:
; Check Pascal 1.1 Firmware Protocol ID bytes
ldx #$00
Check: ldy IdOfsTable,x
lda IdValTable,x
cmp ZILOG_BASE,y
bne NoDevice
inx
cpx #IdTableLen
bcc Check
beq HardwareFound
bit $C082 ; Check if this is a IIgs
lda $FE1F ; https://prodos8.com/docs/technote/misc/07/
cmp #$60 ; Everything but the IIgs has an RTS there
bne HardwareFound
; Device (hardware) not found
NoDevice:
bit $C080
lda #SER_ERR_NO_DEVICE
SetupErrOut:
cli
ldx #$00 ; Promote char return value
stx Slot ; Mark port closed
stx Opened ; Mark port closed
rts
HardwareFound:
bit $C080
sei ; Disable interrupts
; Check if the handshake setting is valid
@ -499,8 +477,8 @@ IntA:
StoreFlag:
sta SER_FLAG
ldy #$02 ; Mark port opened
sty Slot
ldy #$01 ; Mark port opened
sty Opened
cli
lda #SER_ERR_OK
.assert SER_ERR_OK = 0, error