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:ƒ SEVEN SUBROUTINES TO ALLOW BASIC        PROGRAMMING ANYWHERE IN MEMORY.&W:ƒ&£:ƒ Copyrighted in the United States        and Canada December, 1989 by&Ç:ƒ BILL DANIELS for DANOSOFT of&ì:ƒ Mississauga, Ontario, Canada.&ó:ƒ'–:ƒ----------------------------------'# :ƒ'•ª:ƒThese subroutines and their use are     explained in the printed Tutorial       that accompanies this disk.'œ´:ƒ'ž:ƒ----------------------------------'ÌÃ:ƒ'ñÅ:ƒ SCREEN DISPLAY & DEMO PROGRAM'øÆ:ƒ(žÈž:‡:‡:‡"       *** BABY BASIC ***":‡:‡"   THIS IS A DEMONSTRATION OF":‡" EXECUTING BASIC PROGRAM LINES":‡"    IN TWO SEPARATE AREAS OF":‡"          COCO MEMORY.")Jˇ:‡"  TO LIST THIS PROGRAM FROM A":‡" COCO 3, USE THE 40-COLUMN TEXT":‡"  SCREEN. COCO 2 USERS WITH A":‡"  PRINTER WILL FIND A PRINTOUT":‡"            USEFUL.":�¦800:‡*͇"   SEVEN SUBROUTINES IN THIS":‡"  PROGRAM PROVIDE ALL THE CODE":‡"  YOU NEED TO DEVELOP A BASIC":‡"  PROGRAM IN MULTIPLE SECTIONS.":‡:‡"   THE METHOD IS EXPLAINED IN":‡"   THE PRINTED TUTORIAL THAT"*„χ"     ACCOMPANIES THIS DISK.":‡:‡" NOT ALL SEVEN SUBS ARE NEEDED":‡"     IN A GIVEN SITUATION.":‡:�¦800*Êч:‡"   HERE ARE THE SEVEN SUBS"ÿ‹(58):‡:‡"NO. LINE       PURPOSE"+\Ò‡:‡"1  10000 JUMP FROM LO TO HI MEM":‡"2  20000 JUMP FROM HI TO LO MEM":‡"3  26000 COPY PROGRAM TO HI MEM":‡"4  28000 8K MEMORY BLOCK SWITCH"+Â܇"5  30000 MOVE SYSTEM STACK":‡"6  40000 RESET PROTECT CHANGES":‡"7  50000 COPY ROM TO RAM":�¦800,g߇:‡:‡"         PLEASE STANDBY":‡:‡:‡"  TRANSFERRING THREE LINES OF":‡:‡"    BASIC CODE TO THE SECOND":‡:‡"    PROGRAMMING AREA IN HIGH":‡:‡"            MEMORY."-Oæ�:€L³24576 ¥ 24808:�A:’L,A:‹L :ƒFor purposes of this demo,  a few short basic lines are being poked into the second programming area in hi  memory. Normally you would use Sub No.3 to place your program segment in hi     memory.-Vç:ƒ-Óè† 0,96,176,0,10,135,58,135,58,135,34,32,84,72,73,83,32,76,73,78,69,32,79,70,32,67,79,68,69,32,87,65,83,32,69,88,69,67,85.Pé† 84,69,68,34,58,135,34,32,32,70,82,79,77,32,84,72,69,32,83,69,67,79,78,68,32,77,69,77,79,82,89,32,65,82,69,65,34,58,135.Îê† 34,32,32,32,32,32,32,32,32,32,73,78,32,72,73,32,77,69,77,79,82,89,46,34,58,135,58,135,58,135,34,32,80,82,69,83,83,32,65/Jë† 78,89,32,75,69,89,32,84,79,32,82,69,84,85,82,78,32,84,79,32,84,72,69,34,58,135,34,32,32,80,82,79,71,82,65,77,32,73,78/Éì† 32,78,79,82,77,65,76,32,76,79,32,77,69,77,79,82,89,46,34,0,96,200,0,20,73,36,179,255,146,58,32,133,32,73,36,179,34,34,320Dí† 167,32,50,48,0,96,231,78,32,146,32,83,84,44,77,83,58,32,146,32,83,84,171,49,44,76,83,58,32,129,165,32,50,53,48,0,0,00Kî:ƒ0oð�¥ 1000 :ƒSet protected memory.1úž:‡:‡:‡:‡" THIS LINE OF CODE WAS EXECUTED":‡:‡"    FROM NORMAL LOW MEMORY.":‡:‡:‡:‡"  PRESS <ENTER> TO END PROGRAM":‡:‡"               OR":�¦8001•
… ÿ’³ÿ‹(13) § Š :„ �¥ 10000 :ƒGoto the Subroutine that causes   the program to jump to the second       program module located in hi memory.1œ:ƒ1ê ‡:‡"     PRESS ANY KEY FOR NEXT";:¢44539:ž:‡:� :ƒHold the current screen.1ñ\:ƒ2f:ƒ----------------------------------2!k:ƒ2Kp:ƒNOW HERE ARE THE SEVEN SUBROUTINES:2Rz:ƒ2{„:ƒ----------------------------------2‚Ž:ƒ2ª˜:ƒPROGRAMMING FOR LO MEMORY - SUB 12±¢:ƒ2àè:ƒPROTECT THE TOP 8K OF USER MEMORY.1010 '3ü•200,24576 :ƒNot needed by Coco23|þ�¥ 250:ƒJump to any line number in      your main controlling program that      you install in the lo memory area.3ƒ
:ƒ3Š:ƒ3Â:ƒSUBROUTINE TO SWITCH PROGRAM TO         HI MEMORY3É:ƒ4‚'ST³25:MS³ÿ†(ST):LS³ÿ†(ST«1): ’ ST,96: ’ ST«1,1: �¥ 10 :ƒ         Where "10" can be any line number in    the hi memory module which is a lower   line number than the number of this5J':ƒline. ST=Start of Basic. MS=Most   significant byte of Basic's address.    LS=Least significant byte. These        variables are saved to be used later    when your program returns to lo memory5QJ8:ƒ5xJ<:ƒ--------------------------------5J=:ƒ5§J>:ƒPROGRAMMING FOR HI MEMORY - SUB 25®J@:ƒ5çJB:ƒSUBROUTINE TO SWITCH PROGRAM TO         LO MEMORY.5îJL:ƒ6¦N ’ ST,MS: ’ ST«1,LS: �¥ 250:ƒ   Where "250" is any line in the lo       memory program with a number less       than this line. The pokes restore       start of basic to lo memory.6­N!:ƒ6Ôc8:ƒ--------------------------------6Ûcj:ƒ7(e,:ƒSUBROUTINE TO TRANSFER LO MEMORY        PROGRAM TO HI MEMORY VIA DISK.7/e^:ƒ7Feh:ƒSUBROUTINE NO. 37Mer:ƒ7âe�A³ÿ†(25):B³ÿ†(27):…B¬A²31 §‡:‡"ERROR. 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This save        is to preserve the segment for          possible later editing which            cannot be done when transferred8áe”:ƒto hi memory.8èe•:ƒ92e—ØM"TRANSFER",A­256,B­256«ÿ†(28),0 :ƒBinary save program in lo memory.9ºe˜… ÿ†(33021)³50 § C³96 :„ C³217 :ƒCheck for CoCo3. If so, offset      factor for the next LOADM is 96 else    it is 217 for a CoCo2.9ýešÓM"TRANSFER",(C¬A)­256 :ƒ Load       the program to hi memory.:‡e¤’25,C :ƒSet start of basic to       24576 ($6000), the CoCo 3 hi memory     8k block. For a CoCo2, the start is     at 55552 ($D900).:Äe®¢&HACEF :ƒROM sub re-addresses          a basic program.;©e³Ò"TRANSFER/BIN":ØM "MODULE/nn",C­256,C­256«8191,0 :ƒWhere "nn" is the       block or segment number of this         module. This newly re-addressed         program module will be loaded in        future via the LOADM command<•eµ:ƒ(without offset) as required by         the control program in lo memory.       Note: The "8191" saves 8k. CoCo 2       users can enter up to "9727".           Also Note: The filename of this         module must be different than<Ïe¶:ƒthe basic source file saved in          line 26003.<Öe·:ƒ<úe¸’25,A :ƒRestore start of Basic.=eÂ�=eÌ:ƒ=.eÖ:ƒ--------------------------------=5kl:ƒ=Ykv:ƒCOCO 3 BLOCK SWITCHER - SUB 4=`k€:ƒ=ÓkŠ:ƒPROGRAMMING TO USE IN LO MEMORY         TO SWITCH 8K MEMORY BLOCKS TO THE       SPACE OCCUPIED BY HI MEMORY.=Úk”:ƒ>Ekž:ƒNote: Do not use this sub until         the CLEAR command has set up            protected hi memory.>Lk¨:ƒ?m`’&HE0E4,48 :ƒWhere "48" is the        block number wanted in Hi memory.       Substitute whatever block number        you decide to select. See the           printed Tutorial for block info.?Ymj¢&HE097 :ƒSwitch in the new block      that was just poked in &HE0E4.?_mt�?fqH:ƒ?�qR:ƒ--------------------------------?”q\:ƒ?àqf:ƒCODE TO MOVE THE STACK TO THE           FIRST GRAPHICS PAGE OF MEMORY?çqh:ƒ@qi:ƒSUBROUTINE NO. 5 -- FOR COCO 3@qj:ƒ@‹qk:ƒ (Prevents Hi-Res Text from            causing a crash when stack is           between 8192/$2000 & 16384/$4000.)@’qp:ƒ@Ýu0À1 :ƒSet aside 1536 bytes in         lo memory for stack. (5120/$1400)A)u:’&HAC41,33 :ƒMake Ramcheck start       at "Fretop" instead of "Botstk".A“u<… ÿ†(&HC004)´²215 §30017 :ƒ     'Checks DOS version. If not 1.1 or       2.1 then skip to line 30017.Bju?A³&HD3D8:’A,158:’A«1,33:’A«2,106:’A«3,228:’&HD3E9,47:�¥ 30020 :ƒPatch the copy command so it          disregards the stack when computing     available memory. Skip next line        which is for DOS 1.0 or 2.0.BÈuAA³&HD2EB:’A,158:’A«1,33:’A«2,18:’&HD2FB,47 :ƒCopy command       patch for DOS 1.0 or 2.0.CuD’&HB4EE,150:’&HB4EF,33 :ƒMake       memory check also see "Fretop".CZuN’118,16:’119,0 :ƒTwo bytes to    vector top of stack to 4096 ($1000).CžuX’&HAD3C,118 :ƒNew DP stack             starting address vector.D[ub•: �¥ 20 :ƒThe Clear command will reset the stack to the new address."Clear" also erases any "Return"        addresses; so this subroutine must end  with a "Goto" to any specific line.Dby:ƒD‰y":ƒ--------------------------------D�y,:ƒD¸y6:ƒRESET PROTECT CODE - SUBROUTINE 6D¿y@:ƒEœ@A³ÿ†(114):B³ÿ†(115) :ƒSave            address of reset vector. ($72)EJœJ’114,0:’115,243 :ƒVector to         spare bytes at 243. ($F3)FœTC³243:’C,18:’C«1,26:’C«2,80:’C«3,127:’C«4,255:’C«5,223:’C«6,126:’C«7,A:’C«8,B :ƒ9-Byte    M.L. routine to prevent Reset from      re-writing ROM to RAM & cancelling      stack & memory block changes.Fœ^�F# (:ƒFJ 2:ƒ--------------------------------FQ <:ƒFh >:ƒSUBROUTINE NO. 7Fo A:ƒG6 F:ƒROUTINE TO COPY TO ALL RAM MODE         (For 64K CoCo 2 users who cannot         use the block switching routines        above, but who can transfer             basic programming to 9728 bytesGý G:ƒ available from 55552 to 65279.          Lines 10000, 26010 & 26020 above        would use a 217 instead of 96           and line 26035 would use 55552 &        65279 for the Savem addresses.)H P:ƒH ÃP’51,ÿ†(166):’52,ÿ†(167)HoÃS:ƒLine 50000 forces the data        pointer to use the data in line 50010.HvÃT:ƒIÃUA$³"":€L³1¥25:�A:A$³A$«ÿ‹(A):‹L:A³ÿ�(A$)«2:¢ÿ†(A)­256«ÿ†(A«1):� :ƒ M.L. data is read to  a variable (A$) & then the variable is  executed.IÃX:ƒIjÃZ† 26,80,142,128,0,166,132,183,255,223,167,128,140,224,0,39,5,183,255,222,32,239,28,175,570.HvÃT:ƒIÃUA$³"":€L³1¥25:�A:A$³A$«ÿ‹(A):‹L:A³ÿ�(A$)«2:¢ÿ†(A)­256«ÿ†(A«1):� :ƒ M.L. data is read to  a variable (A$) & then the variable is  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