diff --git a/Firmware/BlankDriveWithFirmware.po b/Firmware/BlankDriveWithFirmware.po index 9c37484..1cf91d5 100644 Binary files a/Firmware/BlankDriveWithFirmware.po and b/Firmware/BlankDriveWithFirmware.po differ diff --git a/Firmware/Firmware.asm b/Firmware/Firmware.asm index b8eb232..6d70cb2 100644 --- a/Firmware/Firmware.asm +++ b/Firmware/Firmware.asm @@ -58,11 +58,13 @@ ldy #knownRts -00C73B 1 85 FB sta jumpAddressHi -00C73D 1 start: -00C73D 1 A9 C0 lda #$C0 -00C73F 1 85 FD sta ioAddressHi -00C741 1 20 58 FF jsr knownRts -00C744 1 BA tsx -00C745 1 BD 00 01 lda $0100,x -00C748 1 0A asl a -00C749 1 0A asl a +00C725 1 F0 06 beq boot +00C727 1 99 0B 07 sta $07D0-knownRts +00C73D 1 85 FB sta jumpAddressHi +00C73F 1 start: +00C73F 1 A9 C0 lda #$C0 +00C741 1 85 FD sta ioAddressHi +00C743 1 20 58 FF jsr knownRts +00C746 1 BA tsx +00C747 1 BD 00 01 lda $0100,x 00C74A 1 0A asl a 00C74B 1 0A asl a -00C74C 1 AA tax -00C74D 1 E4 43 cpx unit ;make sure same as ProDOS -00C74F 1 F0 04 beq docmd ;yep, do command -00C751 1 38 sec ;nope, set device not connected -00C752 1 A9 28 lda #nodev -00C754 1 60 rts ;go back to ProDOS -00C755 1 -00C755 1 docmd: -00C755 1 A5 42 lda command -00C757 1 F0 08 beq getstat ;command 0 is GetStatus -00C759 1 C9 01 cmp #$01 -00C75B 1 F0 0C beq readblk ;command 1 is ReadBlock -00C75D 1 38 sec ;Format/Write not permitted -00C75E 1 A9 2B lda #wperr ;write protect error -00C760 1 60 rts ;go back to ProDOS -00C761 1 -00C761 1 getstat: -00C761 1 18 clc ;send back status -00C762 1 A9 00 lda #$00 ;good status -00C764 1 A2 00 ldx #$00 ;1024 blocks -00C766 1 A0 04 ldy #$04 ; -00C768 1 60 rts -00C769 1 -00C769 1 readblk: -00C769 1 A5 47 lda blkhi ;get hi block -00C76B 1 0A asl a ;shift up to top 3 bits -00C76C 1 0A asl a ;since that's all the high -00C76D 1 0A asl a ;blocks we can handle -00C76E 1 0A asl a ; -00C76F 1 0A asl a ; -00C770 1 85 F8 sta highLatch ;save it in scratch ram 0 -00C772 1 ;so we can stuff it in the -00C772 1 ;high latch later -00C772 1 A5 46 lda blklo ;get low block -00C774 1 4A lsr a ;shift so we get the top 5 -00C775 1 4A lsr a ;bits - this also goes in -00C776 1 4A lsr a ;the high latch -00C777 1 05 F8 ora highLatch ;add it to those top 3 bits -00C779 1 85 F8 sta highLatch ;save it back in scratch ram -00C77B 1 A5 46 lda blklo ;get low block -00C77D 1 0A asl a ;shift it to top 3 bits -00C77E 1 0A asl a ; -00C77F 1 0A asl a ; +00C74C 1 0A asl a +00C74D 1 0A asl a +00C74E 1 AA tax +00C74F 1 E4 43 cpx unit ;make sure same as ProDOS +00C751 1 F0 04 beq docmd ;yep, do command +00C753 1 38 sec ;nope, set device not connected +00C754 1 A9 28 lda #nodev +00C756 1 60 rts ;go back to ProDOS +00C757 1 +00C757 1 docmd: +00C757 1 A5 42 lda command +00C759 1 F0 08 beq getstat ;command 0 is GetStatus +00C75B 1 C9 01 cmp #$01 +00C75D 1 F0 0C beq readblk ;command 1 is ReadBlock +00C75F 1 38 sec ;Format/Write not permitted +00C760 1 A9 2B lda #wperr ;write protect error +00C762 1 60 rts ;go back to ProDOS +00C763 1 +00C763 1 getstat: +00C763 1 18 clc ;send back status +00C764 1 A9 00 lda #$00 ;good status +00C766 1 A2 00 ldx #$00 ;1024 blocks +00C768 1 A0 04 ldy #$04 ; +00C76A 1 60 rts +00C76B 1 +00C76B 1 readblk: +00C76B 1 A5 47 lda blkhi ;get hi block +00C76D 1 0A asl a ;shift up to top 3 bits +00C76E 1 0A asl a ;since that's all the high +00C76F 1 0A asl a ;blocks we can handle +00C770 1 0A asl a ; +00C771 1 0A asl a ; +00C772 1 85 F8 sta highLatch ;save it in scratch ram 0 +00C774 1 ;so we can stuff it in the +00C774 1 ;high latch later +00C774 1 A5 46 lda blklo ;get low block +00C776 1 4A lsr a ;shift so we get the top 5 +00C777 1 4A lsr a ;bits - this also goes in +00C778 1 4A lsr a ;the high latch +00C779 1 05 F8 ora highLatch ;add it to those top 3 bits +00C77B 1 85 F8 sta highLatch ;save it back in scratch ram +00C77D 1 A5 46 lda blklo ;get low block +00C77F 1 0A asl a ;shift it to top 3 bits 00C780 1 0A asl a ; 00C781 1 0A asl a ; -00C782 1 85 F9 sta lowLatch -00C784 1 A9 02 lda #$02 -00C786 1 85 FF sta blockHalfCounter -00C788 1 -00C788 1 ;This gets 256 bytes from the ROM card -00C788 1 -00C788 1 read256: -00C788 1 A0 00 ldy #$00 -00C78A 1 A5 F8 lda highLatch ;get high latch value -00C78C 1 9D 81 C0 sta writeLatchHigh,x ;set high latch for card -00C78F 1 loop256: -00C78F 1 A5 F9 lda lowLatch -00C791 1 9D 80 C0 sta writeLatchLow,x -00C794 1 8A txa -00C795 1 09 80 ora #$80 -00C797 1 85 FC sta ioAddressLo -00C799 1 loop16: -00C799 1 84 FE sty tempY -00C79B 1 A0 00 ldy #$00 -00C79D 1 B1 FC lda (ioAddressLo),y -00C79F 1 A4 FE ldy tempY -00C7A1 1 91 44 sta (buflo),y -00C7A3 1 C8 iny -00C7A4 1 E6 FC inc ioAddressLo -00C7A6 1 A5 FC lda ioAddressLo -00C7A8 1 29 0F and #$0F -00C7AA 1 D0 ED bne loop16 -00C7AC 1 E6 F9 inc lowLatch -00C7AE 1 C0 00 cpy #$00 -00C7B0 1 D0 DD bne loop256 -00C7B2 1 C6 FF dec blockHalfCounter -00C7B4 1 D0 08 bne readnext256 -00C7B6 1 C6 45 dec bufhi -00C7B8 1 18 clc ;clear error code for success -00C7B9 1 A9 00 lda #$00 -00C7BB 1 6C FA 00 jmp (jumpAddressLo) -00C7BE 1 -00C7BE 1 readnext256: -00C7BE 1 E6 45 inc bufhi -00C7C0 1 18 clc -00C7C1 1 90 C5 bcc read256 -00C7C3 1 -00C7C3 1 ;macro for string with high-bit set -00C7C3 1 .macro aschi str -00C7C3 1 .repeat .strlen (str), c -00C7C3 1 .byte .strat (str, c) | $80 -00C7C3 1 .endrep -00C7C3 1 .endmacro -00C7C3 1 -00C7C3 1 D2 CF CD AD text: aschi "ROM-Drive (c)1998-2021 Terence J. Boldt" -00C7C7 1 C4 F2 E9 F6 -00C7CB 1 E5 A0 A8 E3 -00C7CF 1 A9 B1 B9 B9 -00C7D3 1 B8 AD B2 B0 -00C7D7 1 B2 B1 A0 D4 -00C7DB 1 E5 F2 E5 EE -00C7DF 1 E3 E5 A0 CA -00C7E3 1 AE A0 C2 EF -00C7E7 1 EC E4 F4 -00C7EA 1 end: -00C7EA 1 00 .byte 0 -00C7EB 1 -00C7EB 1 ; These bytes need to be at the top of the 256 byte firmware as ProDOS -00C7EB 1 ; uses these to find the entry point and drive capabilities -00C7EB 1 -00C7EB 1 00 00 00 00 .repeat 251-