diff --git a/README.md b/README.md index 5490150..6802a86 100644 --- a/README.md +++ b/README.md @@ -6,7 +6,7 @@ Printing the fractional value of a 16-bit fixed point number in decimal is rathe For example, the number `0.7106` in 16-bit fixed point is 0.71506 * 65536 = 46,569 = `$B5E9` -How do we convert the number `$B5E9` back into `7106` ? By _digit peeling._ +How do we convert the number `$B5E9` back into `.7106` ? By _digit peeling._ 1. Multipy N by 10 2. Print the Integer Part digit @@ -40,20 +40,21 @@ See file [print_fract.s](print_fract.s) ``` CALL-151 - 0800:a2 b5 a0 e9 20 15 08 a2 00 bd 70 08 20 ed fd e8 - 0810:e0 05 d0 f5 60 a9 00 8d 6a 08 8e 6b 08 8c 6c 08 - 0820:a2 00 20 60 08 20 54 08 20 60 08 20 60 08 20 44 - 0830:08 ad 6a 08 09 b0 9d 70 08 a9 00 8d 6a 08 e8 e0 - 0840:05 d0 df 60 18 a0 02 b9 6a 08 79 6d 08 99 6a 08 - 0850:88 10 f4 60 a0 02 b9 6a 08 99 6d 08 88 10 f7 60 - 0860:0e 6c 08 2e 6b 08 2e 6a 08 60 00 00 00 00 00 00 - 0870:00 00 00 00 00 + 0800:a2 b5 a0 e9 20 1a 08 a9 ae 20 ed fd a2 00 bd 76 + 0810:08 20 ed fd e8 e0 05 d0 f5 60 8e 71 08 8c 72 08 + 0820:20 6a 08 aa 20 60 08 20 54 08 20 60 08 20 60 08 + 0830:20 44 08 ad 70 08 09 b0 9d 76 08 20 6a 08 e8 e0 + 0840:05 d0 e1 60 18 a0 02 b9 70 08 79 73 08 99 70 08 + 0850:88 10 f4 60 a0 02 b9 70 08 99 73 08 88 10 f7 60 + 0860:0e 72 08 2e 71 08 2e 70 08 60 a9 00 8d 70 08 60 + 0870:00 00 00 00 00 00 00 00 00 00 00 800G + E000G ``` ## Output ``` -71058 +.71058 ``` diff --git a/print_fract.bin b/print_fract.bin new file mode 100644 index 0000000..2850b64 Binary files /dev/null and b/print_fract.bin differ diff --git a/print_fract.s b/print_fract.s index 3ea01bc..ee772cd 100644 --- a/print_fract.s +++ b/print_fract.s @@ -1,5 +1,7 @@ ORG $800 +COUT EQU $FDED + ; ==================== Demo ==================== Demo @@ -17,10 +19,12 @@ Demo LDY #$E9 JSR PrintFract + LDA #'.'+$80 + JSR COUT LDX #0 PrintDigit LDA D0,X - JSR $FDED + JSR COUT INX CPX #5 ; 5 decimal digits BNE PrintDigit