Merge pull request #15 from jgharston/main

Tidied API block, vectors, initialisation, other bits

Update20210725.txt

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+Updates to Applecorn MOS 25-Jul-2021
+------------------------------------
+
+Corrected and updated MOS API entry block
+Created default vector table
+Vectors initialised from default vector table
+Corrected OSFILE error numbers
+PRSTR prints via OSASCI
+Laid out zero page workspace
+Added OUT2HEX, optimised OUTHEX
+Added WRCH wrapper to OUTCHAR
+OSRDLINE recognises BS for delete
+RDCH sets ESCFLAG if Escape returned, lets REPEAT PRINT GET:UNTIL 0 to stop

build.bat

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+cd /d %0\..
+merlin32 -V . applecorn.s
+copy applecorn applecorn#062000
+pause

notes.txt

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+Apple IIe colours
+
+Apple         BBC IBGR
+0 Black        0  0000
+8 Brown        1  0001
+4 Dark Green   2  0010
+9 Orange       3  0011
+2 Dark Blue    4  0100
+3 Purple       5  0101
+6 Medium Blue  6  0100
+5 Grey 1      7/8       1000 or 1001
+A Grey 2      7/8       1000 or 1001
+B Pink         9  1001
+C Light Green  A  1010
+D Yellow       B  1011
+7 Light Blue   C  1100
+1 Magenta      D  1101
+E Aquamarine   E  1110
+F White        F  1111