Mercurial > hg > Members > kono > nitros9-code
view level1/modules/scbbt.asm @ 3246:be3446f758ca
Updated dwread.asm and dwwrite.asm so that the 6551 routines could have specially defined
flags so that some of the addresses could be overridden by the make files if needed.
| author | David Ladd <drencor-xeen@users.sourceforge.net> |
|---|---|
| date | Sun, 11 Mar 2018 01:30:30 -0600 |
| parents | b41df77588b0 |
| children |
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******************************************************************** * scbbt - CoCo Bit-Banger Terminal Driver * * $Id$ * * Edt/Rev YYYY/MM/DD Modified by * Comment * ------------------------------------------------------------------ * 9 ????/??/?? ??? * Original Tandy L2 distribution version. * * 10 ????/??/?? ??? * Added baud delay table for NitrOS-9. * * 11 2003/12/15 Boisy G. Pitre * Merged Level 1 and Level 2 sources for now. nam scbbt ttl CoCo Bit-Banger Terminal Driver * Disassembled 98/08/23 20:58:36 by Disasm v1.6 (C) 1988 by RML ifp1 use defsfile endc tylg set Drivr+Objct atrv set ReEnt+rev rev set $00 edition set 9 mod eom,name,tylg,atrv,start,size fcb UPDAT. name fcs /scbbt/ fcb edition IFGT Level-1 u0000 rmb 29 u001D rmb 1 u001E rmb 1 u001F rmb 1 u0020 rmb 2 u0022 rmb 2 u0024 rmb 1 u0025 rmb 1 size equ . * Baud Rate Delay Table DelayTbl IFEQ H6309 * 6809 delay values (1.89MHz) fdb $090C 110 baud fdb $034C 300 baud fdb $01A2 600 baud fdb $00CE 1200 baud fdb $0062 2400 baud fdb $002E 4800 baud fdb $0012 9600 baud fdb $0003 32000 baud ELSE * 6309 native mode delay values (1.89MHz) fdb $090C 110 baud (Unchanged, unknown) fdb $03D0 300 baud fdb $01A2 600 baud (Unchanged, unknown) fdb $00F0 1200 baud fdb $0073 2400 baud fdb $0036 4800 baud fdb $0017 9600 baud fdb $0003 32000 baud (Unchanged, unknown) ENDC start lbra Init lbra Read lbra Write lbra GetStat lbra SetStat lbra Term * Init * * Entry: * Y = address of device descriptor * U = address of device memory area * * Exit: * CC = carry set on error * B = error code * Init pshs cc orcc #IntMasks ldx #PIA1Base clr $01,x ldd <IT.COL,y get col/row bytes std <u0024,u lda #$FE sta ,x lda #$36 sta $01,x lda ,x ldd <IT.PAR,y get parity/baud lbsr L0148 puls cc clrb * Term * * Entry: * U = address of device memory area * * Exit: * CC = carry set on error * B = error code * Term rts * Read * * Entry: * Y = address of path descriptor * U = address of device memory area * * Exit: * A = character read * CC = carry set on error * B = error code * Read bsr L00AC bcs L00C8 ldb #$08 pshs b,cc tst <u001E,u beq L0066 dec $01,s L0066 bra L0077 L0068 lda <PD.BAU,y anda #$0F cmpa #$07 beq L0077 ldx #$0001 os9 F$Sleep L0077 pshs y ldy #$FFFF L007D lda >PIA1Base+2 leay -$01,y beq L008B lsra bcs L007D puls y bra L0090 L008B puls y lsra bcs L0068 L0090 orcc #IntMasks clra bsr L00D5 L0095 bsr L00CE ldb >PIA1Base+2 lsrb rora dec $01,s bne L0095 bsr L00D5 tst <u001E,u beq L00A8 lsra L00A8 puls b,cc clrb rts L00AC pshs a lda <PD.BAU,y anda #$0F cmpa #$08 bcc L00C4 lsla leax >DelayTbl,pcr ldd a,x std <u0020,u clrb puls pc,a L00C4 ldb #E$BMode puls a L00C8 orcc #Carry rts L00CB stb >PIA1Base L00CE pshs b,a ldd <u0020,u bra L00DC L00D5 pshs b,a ldd <u0020,u lsra rorb L00DC subd #$0001 bne L00DC puls pc,b,a * Write * * Entry: * A = character to write * Y = address of path descriptor * U = address of device memory area * * Exit: * CC = carry set on error * B = error code * Write bsr L00AC bcs L00C8 ldb #$09 pshs b,cc orcc #IntMasks tst <u001E,u beq L00F4 dec $01,s L00F4 andcc #^Carry L00F6 ldb #$02 bcs L00FB clrb L00FB bsr L00CB lsra dec $01,s bne L00F6 ldb <u001D,u beq L010B andb #$FE bsr L00CB L010B ldb #$02 bsr L00CB tst <u001F,u beq L0118 ldb #$02 bsr L00CB L0118 puls pc,b,cc * GetStat * * Entry: * A = function code * Y = address of path descriptor * U = address of device memory area * * Exit: * CC = carry set on error * B = error code * GetStat cmpa #SS.EOF bne L0120 L011E clrb rts L0120 ldx PD.RGS,y cmpa #SS.ScSiz beq L0131 cmpa #SS.ComSt bne L017E ldd <u0022,u std R$Y,x bra L011E L0131 ldx PD.RGS,y clra ldb <u0024,u std R$X,x ldb <u0025,u std R$Y,x bra L011E * SetStat * * Entry: * A = function code * Y = address of path descriptor * U = address of device memory area * * Exit: * CC = carry set on error * B = error code * SetStat cmpa #SS.ComSt bne L017E ldx PD.RGS,y ldd R$Y,x L0148 std <u0022,u clra clrb std <u001D,u sta <u001F,u ldd <u0022,u tstb bpl L015C inc <u001F,u L015C bitb #$40 bne L017A bitb #$20 beq L0167 inc <u001E,u L0167 bita #$20 beq L0179 bita #$80 beq L017A inc <u001D,u bita #$40 bne L0179 inc <u001D,u L0179 rts L017A comb ldb #E$BMode rts L017E comb ldb #E$UnkSvc rts ELSE rmb V.SCF u001D rmb 1 u001E rmb 1 u001F rmb 1 BaudCnt rmb 2 baud rate counter u0022 rmb 2 u0024 rmb 1 u0025 rmb 1 size equ . BaudTbl fdb $0482 110 baud fdb $01A2 300 baud fdb $00CD 600 baud fdb $0063 1200 baud fdb $002D 2400 baud fdb $0013 4800 baud fdb $0005 9600 baud start lbra Init lbra Read lbra Write lbra GetStat lbra SetStat lbra Term * Init * * Entry: * Y = address of device descriptor * U = address of device memory area * * Exit: * CC = carry set on error * B = error code * Init pshs cc orcc #IntMasks ldx #PIA1Base clr $01,x ldd <IT.COL,y get col/row bytes std <u0024,u lda #$FE sta ,x lda #$36 sta $01,x lda ,x ldd <IT.PAR,y get parity/baud lbsr L014D puls cc clrb * Term * * Entry: * U = address of device memory area * * Exit: * CC = carry set on error * B = error code * Term rts * Read * * Entry: * Y = address of path descriptor * U = address of device memory area * * Exit: * A = character read * CC = carry set on error * B = error code * Read bsr L00B1 bcs L00CD ldb #$08 pshs b,cc tst <u001E,u beq L0066 dec $01,s L0066 bra L006E L0068 ldx #$0001 os9 F$Sleep L006E lda >PIA1Base+2 lsra pshs x,a lda >$FF69 bpl L0091 lda >PIA1Base+3 bita #$01 beq L0091 bita #$80 beq L0091 orcc #Entire leax <L0091,pcr pshs x pshs u,y,x,dp,b,a,cc jmp [D.SvcIRQ] L0091 puls x,a bcs L0068 orcc #IntMasks clra bsr L00DA L009A bsr L00D3 ldb >PIA1Base+2 lsrb rora dec $01,s bne L009A bsr L00DA tst <u001E,u beq L00AD lsra L00AD puls b,cc clrb rts L00B1 pshs a lda <PD.BAU,y anda #$0F mask out baud rate cmpa #B19200 bcc L00C9 lsla leax >BaudTbl,pcr ldd a,x std <BaudCnt,u clrb puls pc,a L00C9 ldb #E$BMode puls a L00CD orcc #Carry rts L00D0 stb >PIA1Base L00D3 pshs b,a ldd <BaudCnt,u bra L00E1 L00DA pshs b,a ldd <BaudCnt,u lsra rorb L00E1 subd #$0001 bne L00E1 puls pc,b,a * Write * * Entry: * A = character to write * Y = address of path descriptor * U = address of device memory area * * Exit: * CC = carry set on error * B = error code * Write bsr L00B1 bcs L00CD ldb #$09 pshs b,cc orcc #IntMasks tst <u001E,u beq L00F9 dec $01,s L00F9 andcc #^Carry L00FB ldb #$02 bcs L0100 clrb L0100 bsr L00D0 lsra dec $01,s bne L00FB ldb <u001D,u beq L0110 andb #$FE bsr L00D0 L0110 ldb #$02 bsr L00D0 tst <u001F,u beq L011D ldb #$02 bsr L00D0 L011D puls pc,b,cc * GetStat * * Entry: * A = function code * Y = address of path descriptor * U = address of device memory area * * Exit: * CC = carry set on error * B = error code * GetStat cmpa #SS.EOF bne L0125 L0123 clrb rts L0125 ldx PD.RGS,y cmpa #SS.ScSiz beq L0136 cmpa #SS.ComSt bne L0183 ldd <u0022,u std R$Y,x bra L0123 L0136 ldx PD.RGS,y clra ldb <u0024,u std R$X,x ldb <u0025,u std R$Y,x bra L0123 * SetStat * * Entry: * A = function code * Y = address of path descriptor * U = address of device memory area * * Exit: * CC = carry set on error * B = error code * SetStat cmpa #SS.ComSt bne L0183 ldx PD.RGS,y ldd R$Y,x L014D std <u0022,u clra clrb std <u001D,u sta <u001F,u ldd <u0022,u tstb bpl L0161 inc <u001F,u L0161 bitb #$40 bne L017F bitb #$20 beq L016C inc <u001E,u L016C bita #$20 beq L017E bita #$80 beq L017F inc <u001D,u bita #$40 bne L017E inc <u001D,u L017E rts L017F comb ldb <E$BMode rts L0183 comb ldb #E$UnkSvc rts ENDC emod eom equ * end