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@@ -14,83 +14,89 @@
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## You should have received a copy of the GNU General Public License
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## along with stage0. If not, see <http://www.gnu.org/licenses/>.
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-# :start ; offset = 0
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+# ;; R14 will be storing our condition
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+# ;;
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+# ;; R13 will be a stack pointer. It will be zero
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+# ;; on the start, and the stack grows up.
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+# ;; This means that when stack is used, the
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+# ;; first instructions of this program will be
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+# ;; overwritten. But because this is initialization
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+# ;; code, it is already not used at the time.
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+# ;; And the stack usage is fixed - there is only one CALL
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+# ;; instruction in this file
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+# ;;
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+# ;; R2 Is our holder.
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+# ;; It holds the first nybble of the byte till the second iteration
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+# ;;
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+# ;; R12 Is our toggle. It is initialized to zero on start.
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+# ;; When non-zero, it means that we are processing the second nybble
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+# ;;
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+# ;; R8 will hold zero. It is initialized to zero on start.
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-0D00003C # TRUE R12 ; Our toggle, set to -1 (0xFFFFFFFF)
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+# :start ; offset = 0
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# ;; Prepare often-used values that will be held in registers
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-090001AC # ABS R10 R12 ; Set R10 to 1
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-E0002D2B1100 # LOADUI R11 0x1100 ; R11 will hold 0x1100
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- #
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- # ;; R14 will be storing our condition
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- # ;;
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- # ;; R13 will be a stack pointer. It will be zero
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- # ;; on the start, and the stack grows up.
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- # ;; This means that when stack is used, the
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- # ;; first instructions of this program will be
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- # ;; overwritten. But because this is initialization
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- # ;; code, it is already not used at the time.
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- # ;; And the stack usage is fixed - there is only one CALL
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- # ;; instruction in this file
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- # ;;
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- # ;; R15 Is our holder. It is initialized to zero on start.
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+E0002D2F000f # LOADUI R15 0xF ; Set R15 to 0xF
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+E0002D2B1101 # LOADUI R11 0x1101 ; R11 will hold 0x1101
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# ;; Prep TAPE_01
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-0900040B # COPY R0 R11 ; 0x1100
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+01100FB8 # MUX R0 R15 R11 R8 ; 0x1100 = ((0x1101 & ~0xF) | (0 | 0xF))
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42100001 # FOPEN_WRITE
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# ;; Prep TAPE_02
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-050210BA # OR R0 R11 R10 ; 0x1101
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+0900040B # COPY R0 R11 ; 0x1101
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42100001 # FOPEN_WRITE
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-# :loop ; offset = 1e
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+# :loop ; offset = 1c
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0D000021 # FALSE R1 ; Read from tty
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42100100 # FGETC ; Read a Char
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E000A030000d # CMPSKIPI.NE R0 13 ; Replace all CR
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E0002D20000a # LOADUI R0 10 ; WIth LF
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-42100200 # FPUTC ; Display the Char to User
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+42100200 # FPUTC
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+
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+# ; Display the Char to User
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# ;; Check for Ctrl-D
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E000A0300004 # CMPSKIPI.NE R0 4
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-3C000108 # JUMP @finish
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+3C000104 # JUMP @finish
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# ;; Check for EOF
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-E0002CC00102 # JUMP.NP R0 @finish
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+E0002CC000fe # JUMP.NP R0 @finish
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# ;; Write out unprocessed byte
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-050211BA # OR R1 R11 R10 ; Write to TAPE_02
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+0900041B # COPY R1 R11 ; Write to TAPE_02
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42100200 # FPUTC ; Print the Char
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# ;; Convert byte to nybble
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-E0002D0D003a # CALLI R13 @hex ; Convert it
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+E0002D0D0036 # CALLI R13 @hex ; Convert it
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# ;; Get another byte if nonhex
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E0002CC0ffc4 # JUMP.NP R0 @loop ; Don't use nonhex chars
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# ;; Deal with the case of second nybble
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-E0002C9C000e # JUMP.Z R12 @second_nybble ; Jump if toggled
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+E0002CAC000c # JUMP.NZ R12 @second_nybble ; Jump if toggled
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# ;; Process first byte of pair
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-E100B0F0000f # ANDI R15 R0 0x0F ; Store First nibble
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-0D00002C # FALSE R12 ; Flip the toggle
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-3C00ffb0 # JUMP @loop
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+0502020F # AND R2 R0 R15 ; Store First nibble
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+0D00003C # TRUE R12 ; Flip the toggle
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+3C00ffb2 # JUMP @loop
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# ;; Combined second nybble in pair with first
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-# :second_nybble ; offset = 6e
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-E0002D5F0004 # SL0I R15 4 ; Shift our first nibble
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-E100B000000f # ANDI R0 R0 0x0F ; Mask out top
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-0500000F # ADD R0 R0 R15 ; Combine nibbles
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+# :second_nybble ; offset = 6a
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+E0002D520004 # SL0I R2 4 ; Shift our first nibble
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+0502000F # AND R0 R0 R15 ; Mask out top
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+05000002 # ADD R0 R0 R2 ; Combine nibbles
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# ;; Writeout and prepare for next cycle
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-0D00003C # TRUE R12 ; Flip the toggle
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+0D00002C # FALSE R12 ; Flip the toggle
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# ; Write the combined byte
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-0900041B # COPY R1 R11 ; To TAPE_01
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+01101FB8 # MUX R1 R15 R11 R8 ; To TAPE_01
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42100200 # FPUTC
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-3C00ff90 # JUMP @loop ; Try to get more bytes
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+3C00ff94 # JUMP @loop ; Try to get more bytes
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-# :hex ; offset = 8e
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+# :hex ; offset = 88
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# ;; Deal with line comments starting with #
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E1001FE00023 # CMPUI R14 R0 35
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@@ -127,37 +133,37 @@ E0002C7E000e # JUMP.LE R14 @ascii_low
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# ;; Ignore the rest
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3C00001e # JUMP @ascii_other
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-# :ascii_num ; offset = f2
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+# :ascii_num ; offset = ec
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E10011000030 # SUBUI R0 R0 48
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0D01001D # RET R13
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-# :ascii_low ; offset = fc
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+# :ascii_low ; offset = f6
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E10011000057 # SUBUI R0 R0 87
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0D01001D # RET R13
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-# :ascii_high ; offset = 106
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+# :ascii_high ; offset = 100
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E10011000037 # SUBUI R0 R0 55
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0D01001D # RET R13
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-# :ascii_other ; offset = 110
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+# :ascii_other ; offset = 10a
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0D000030 # TRUE R0
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0D01001D # RET R13
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-# :ascii_comment ; offset = 118
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+# :ascii_comment ; offset = 112
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0D000021 # FALSE R1 ; Read from tty
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42100100 # FGETC ; Read another char
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E000A030000d # CMPSKIPI.NE R0 13 ; Replace all CR
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E0002D20000a # LOADUI R0 10 ; WIth LF
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42100200 # FPUTC ; Let the user see it
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E1001FE0000a # CMPUI R14 R0 10 ; Stop at the end of line
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-050211BA # OR R1 R11 R10 ; Write to TAPE_02
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+0900041B # COPY R1 R11 ; Write to TAPE_02
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42100200 # FPUTC ; The char we just read
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E0002C6Effd4 # JUMP.NE R14 @ascii_comment ; Otherwise keep looping
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3C00ffc8 # JUMP @ascii_other
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-# :finish ; offset = 148
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-0900040B # COPY R0 R11 ; Close TAPE_01
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+# :finish ; offset = 142
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+01100FB8 # MUX R0 R15 R11 R8 ; Close TAPE_01
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42100002 # FCLOSE
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-050210BA # OR R0 R11 R10 ; Close TAPE_02
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+0900040B # COPY R0 R11 ; Close TAPE_02
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42100002 # FCLOSE
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FFFFFFFF # HALT
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Jeremiah