Merge pull request #22 from dgpv/stage0_minimization
reduce stage0_monitor size by 6 bytes (toggle default zero, use mux)
This commit is contained in:
commit
6d3f3390de
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@ -37,7 +37,7 @@ gcc Linux\ Bootstrap/hex.c -o bin/hex
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Then we can use it to make our bootstrap binary:
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./bin/hex < stage0/stage0_monitor.hex0 > roms/stage0_monitor
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Which should have the sha256sum of c9d397b195c6ba2bb4b19428d8b21e7737a32e5275f3027270d8925aec878042
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Which should have the sha256sum of a551568d72804a2de6f6f94fcb507452e9d672c7638beb170dde84a9bf7fb82a
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* Step 2 create a hex assembler
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Now that we have a Hex monitor, we are now capable of either creating a text file (no ability to correct mistakes along the way) or any arbitrary hex program we want.
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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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# ;; 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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# :start ; offset = 0
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0D00003C # TRUE R12 ; Our toggle, set to -1 (0xFFFFFFFF)
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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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# ; 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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@ -14,32 +14,36 @@
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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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;; 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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:start
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TRUE R12 ; Our toggle, set to -1 (0xFFFFFFFF)
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;; Prepare often-used values that will be held in registers
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ABS R10 R12 ; Set R10 to 1
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LOADUI R11 0x1100 ; R11 will hold 0x1100
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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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LOADUI R15 0xF ; Set R15 to 0xF
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LOADUI R11 0x1101 ; R11 will hold 0x1101
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;; Prep TAPE_01
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COPY R0 R11 ; 0x1100
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MUX R0 R15 R11 R8 ; 0x1100 = ((0x1101 & ~0xF) | (0 | 0xF))
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FOPEN_WRITE
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;; Prep TAPE_02
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OR R0 R11 R10 ; 0x1101
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COPY R0 R11 ; 0x1101
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FOPEN_WRITE
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:loop
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@ -59,7 +63,7 @@
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JUMP.NP R0 @finish
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;; Write out unprocessed byte
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OR R1 R11 R10 ; Write to TAPE_02
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COPY R1 R11 ; Write to TAPE_02
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FPUTC ; Print the Char
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;; Convert byte to nybble
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@ -69,23 +73,23 @@
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JUMP.NP R0 @loop ; Don't use nonhex chars
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;; Deal with the case of second nybble
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JUMP.Z R12 @second_nybble ; Jump if toggled
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JUMP.NZ R12 @second_nybble ; Jump if toggled
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;; Process first byte of pair
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ANDI R15 R0 0x0F ; Store First nibble
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FALSE R12 ; Flip the toggle
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AND R2 R0 R15 ; Store First nibble
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TRUE R12 ; Flip the toggle
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JUMP @loop
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;; Combined second nybble in pair with first
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:second_nybble
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SL0I R15 4 ; Shift our first nibble
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ANDI R0 R0 0x0F ; Mask out top
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ADD R0 R0 R15 ; Combine nibbles
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SL0I R2 4 ; Shift our first nibble
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AND R0 R0 R15 ; Mask out top
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ADD R0 R0 R2 ; Combine nibbles
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;; Writeout and prepare for next cycle
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TRUE R12 ; Flip the toggle
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FALSE R12 ; Flip the toggle
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; Write the combined byte
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COPY R1 R11 ; To TAPE_01
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MUX R1 R15 R11 R8 ; To TAPE_01
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FPUTC
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JUMP @loop ; Try to get more bytes
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@ -136,14 +140,14 @@
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LOADUI R0 10 ; WIth LF
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FPUTC ; Let the user see it
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CMPUI R14 R0 10 ; Stop at the end of line
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OR R1 R11 R10 ; Write to TAPE_02
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COPY R1 R11 ; Write to TAPE_02
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FPUTC ; The char we just read
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JUMP.NE R14 @ascii_comment ; Otherwise keep looping
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JUMP @ascii_other
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:finish
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COPY R0 R11 ; Close TAPE_01
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MUX R0 R15 R11 R8 ; Close TAPE_01
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FCLOSE
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OR R0 R11 R10 ; Close TAPE_02
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COPY R0 R11 ; Close TAPE_02
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FCLOSE
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HALT
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@ -5,7 +5,7 @@ f4bbf9e9c4828170d0c153ac265382dc705643f95efd2a029243326d426be5a4 roms/forth
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2b80849180d5fb3757bcca2471b6337808e5b5ca80b18d93fa82ddef0435b84b roms/lisp
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3020b194ead31ae19ba66fc35ed95465514373f6005896350d1608c9efabbdca roms/M0
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059d38e34275029f2de5f600f08fe01bd13cd173f7da58e3fbec7114074beff2 roms/SET
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c9d397b195c6ba2bb4b19428d8b21e7737a32e5275f3027270d8925aec878042 roms/stage0_monitor
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a551568d72804a2de6f6f94fcb507452e9d672c7638beb170dde84a9bf7fb82a roms/stage0_monitor
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13b45134a88c1c6db349cb40f82269cee9edfce71ac644dc0e137bad053bf5ce roms/stage1_assembler-0
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156f555fce5b02f52445652b1ed0b443295706cdfbe23c5a021bd4efc77179bb roms/stage1_assembler-1
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2c02c50958f489a660a4915d2a9e207a0c61f411d42628bdaf4dcf6bf7149a9d roms/stage1_assembler-2
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