PR#3 PREFIX /A2OSX.BUILD LOMEM $A00 INC 1 AUTO 6 .LIST OFF .OP 65C02 .OR $2000 .TF /A2OSX.BUILD/DRV/SSC.I.DRV *-------------------------------------- .INB /A2OSX.BUILD/INC/MACROS.I .INB /A2OSX.BUILD/INC/A2OSX.I .INB /A2OSX.BUILD/INC/MLI.ERR.I .INB /A2OSX.BUILD/INC/COM.6551.I *-------------------------------------- BUF.SIZE .EQ $40 BUF.MASK .EQ $3F *-------------------------------------- ZPTmpPtr1 .EQ ZPDRV *-------------------------------------- * File Header (16 Bytes) *-------------------------------------- CS.START cld jmp Dev.Detect cld,jmp abs=DRV .DA #$61 6502,Level 1 (65c02) .DA #1 DRV Layout Version 1 .DA 0 .DA CS.END-CS.START Code Length .DA DEV.HEADER-CS.START Device Header Offset .DA DRV.CS.START-CS.START Driver Code Offset .DA DRV.CS.END-DRV.CS.START Drv Code Length *-------------------------------------- * Relocation Table *-------------------------------------- L.MSG.DETECT .DA MSG.DETECT L.MSG.DETECT.OK .DA MSG.DETECT.OK L.MSG.DETECT.KO .DA MSG.DETECT.KO L.DEV.HEADER.NAME .DA DEV.HEADER.NAME .DA 0 End Of Reloc Table *-------------------------------------- Dev.Detect >STYA ARGS >LDYA L.MSG.DETECT >SYSCALL PrintF.YA stz ZPTmpPtr1 lda #$C1 sta ZPTmpPtr1+1 .1 and #$0f tay lda A2osX.S,y bne .3 ldx #DEVSIG.Length-1 .2 ldy DEVSIG.Offset,x lda (ZPTmpPtr1),y cmp DEVSIG.Value,x bne .3 dex bpl .2 bra .4 .3 inc ZPTmpPtr1+1 no match, try next slot.... lda ZPTmpPtr1+1 cmp #$C8 bne .1 >LDYA L.MSG.DETECT.KO >SYSCALL PrintF.YA lda #MLI.E.NODEV Not Found in any slot, exiting sec rts .4 lda ZPTmpPtr1+1 and #$0F pha tay lda #A2osX.S.COM sta A2osX.S,y pla ora #$30 sta DEV.HEADER.NAME+3 asl asl asl asl sta DEVSLOTn0 >PUSHW L.DEV.HEADER.NAME >LDYA L.MSG.DETECT.OK >SYSCALL PrintF.YA clc rts *-------------------------------------- CS.END DEVSIG.Offset .HS 05070B0C DEVSIG.Value .HS 38180131 DEVSIG.Length .EQ DEVSIG.Value-DEVSIG.Offset MSG.DETECT >CSTR "Apple SSC (Super Serial Card,//c Serial Port) Driver (IRQ Enabled).\r\n" MSG.DETECT.OK >CSTR "SSC Installed As Device : %s\r\n" MSG.DETECT.KO >CSTR "No SSC Found.\r\n" ARGS .BS 2 *-------------------------------------- * Device Header (16 Bytes) *-------------------------------------- DEV.HEADER cld jmp (DRV.CS.START,x) .DA #S.DEV.S.WRITE+S.DEV.S.READ+S.DEV.S.IRQ .BS 6 DEV.HEADER.NAME >CSTR "COM1" NAME *-------------------------------------- * Driver Code *-------------------------------------- DRV.CS.START .DA STATUS .DA A2osX.BADCALL .DA A2osX.BADCALL .DA A2osX.BADCALL .DA CONTROL .DA A2osX.BADCALL .DA OPEN .DA CLOSE .DA READ .DA WRITE .DA IRQ L.STAT .DA STAT .DA 0 end or relocation *-------------------------------------- STATUS >LDYA L.STAT clc rts *-------------------------------------- CONTROL clc rts *-------------------------------------- OPEN php sei ldx DEVSLOTn0 stz SSC.RESET,x stz INBUF.HEAD stz INBUF.TAIL stz OUTBUF.HEAD stz OUTBUF.TAIL lda #SSC.CTL.CLKEXT+SSC.CTL.B9600+SSC.CTL.8D+SSC.CTL.1S+SSC.CMD.NOP sta SSC.CTL,x lda #SSC.CMD.TEIRQ+SSC.CMD.TE+SSC.CMD.DTR sta SSC.CMD,x lda SSC.DATA,x discard any garbage byte lda SSC.STATUS,x clear any IRQ pending plp clc rts *-------------------------------------- CLOSE php sei ldx DEVSLOTn0 stz SSC.RESET,x plp clc rts *-------------------------------------- READ php sei ldx INBUF.TAIL cpx INBUF.HEAD beq .9 lda INBUF,x inx cpx #BUF.SIZE bne .1 ldx #0 .1 stx INBUF.TAIL plp clc rts .9 plp lda #0 sec rts *-------------------------------------- WRITE php sei tay save char in Y ldx DEVSLOTn0 * lda SSC.STATUS,x * bit #SSC.STATUS.DCD+SSC.STATUS.DSR true when 0 * bne .9 lda OUTBUF.HEAD cmp OUTBUF.TAIL Buffer Empty? bne .11 not empty, queue char lda SSC.STATUS,x and #SSC.STATUS.TDRE Register Empty ? beq .10 not empty, queue char tya yes, write directly to ACIA sta SSC.DATA,x plp clc rts .10 lda OUTBUF.HEAD .11 tax inc and #BUF.MASK cmp OUTBUF.TAIL beq .9 Buffer Full!! sta OUTBUF.TAIL tya sta OUTBUF,x * ldx DEVSLOTn0 * lda #SSC.CMD.TEIRQ+SSC.CMD.DTR * sta SSC.CMD,x plp clc rts .9 plp sec rts *-------------------------------------- * IRQ Handler * on exit, CC if handled *-------------------------------------- IRQ stz .8+1 .1 ldx DEVSLOTn0 lda SSC.STATUS,x * bpl .9 IRQ from this device ? no, exit !!!!Applewin bug #308!!!! bit #SSC.STATUS.RDRF incoming char? beq .4 *------------ IRQ In ldy SSC.DATA,x read data to clear IRQ ldx INBUF.HEAD txa inc and #BUF.MASK cmp INBUF.TAIL beq .8 buffer full, discard and exit sta INBUF.HEAD tya sta INBUF,x dec .8+1 bra .1 *------------ IRQ Out .3 ldx DEVSLOTn0 lda SSC.STATUS,x .4 bit #SSC.STATUS.TDRE beq .8 no transmition possible.... ldy OUTBUF.TAIL something to transmit ? cpy OUTBUF.HEAD beq .8 lda OUTBUF,y sta SSC.DATA,x iny cpy #BUF.SIZE bne .5 ldy #0 .5 sty OUTBUF.TAIL dec .8+1 bra .3 .8 lda #$ff did we finally handle and IRQ condtion ? beq .9 clc rts .9 sec rts *-------------------------------------- DRV.CS.END DEVSLOTn0 .BS 1 INBUF.TAIL .BS 1 INBUF.HEAD .BS 1 OUTBUF.TAIL .BS 1 OUTBUF.HEAD .BS 1 INBUF .BS BUF.SIZE OUTBUF .BS BUF.SIZE *-------------------------------------- STAT .DA #S.DSTAT.S.WRITE+S.DSTAT.S.READ+S.DEV.S.IRQ .DA #0,#0,#0 >PSTR "Serial Card/Port" .DA #S.DSTAT.T.CHAR .DA #0 .DA $0900 *-------------------------------------- MAN SAVE /A2OSX.SRC/DRV/SSC.I.DRV.S ASM