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THAT WAS AT THE NEW LOCATION IS LOST.
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CTRL X: THIS WILL EXIT TO EITHER A
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MONITOR (OR OTHER PROGRAM) AT $C000
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(49152), OR IT WILL COLDSTART BASIC
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BY DOING A JMP $FCE2 (64738).
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IF YOU WANT TO RESTART THE EDITOR,
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FROM A MONITOR IT WOULD TAKE G 1100.
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FROM BASIC TRY SYS 4352. THIS ALL
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ASSUMES THAT YOU HAVEN'T OVERWRITTEN
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IT IN THE MEANTIME.
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IN GENERAL, COMMANDS THAT REQUIRE
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FURTHER INPUT FROM YOU WILL PROMPT YOU
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AS THEY PROCEED. SINGLE LETTER RESPONSES
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WON'T NEED A RETURN AFTER THEM.
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4 USING THE BLOCKS
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YOU SHOULD HAVE GOTTEN A THREE PART,
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BASIC LANGUAGE DEMO WITH THIS. THE FIRST
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PART, BLOCK.DEMOSTART, IS A ONE LINE
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PROGRAM THAT SETS THE START OF BASIC TO
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4352, JUST PAST THE END OF THE COLOR-
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FILE, AND LOADS THE SECOND PART, BLOCK.
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DEMO . THIS THEN LOADS THE CHARACTERSET
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DEMOSET, SETS UP THE COLORS, AND SHOWS
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THE DEMO.
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FEEL FREE TO USE THESE ROUTINES TO
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WRITE YOUR OWN PROGRAMS AROUND. THEY ARE
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EXTENSIVELY REM'D AND FAIRLY MODULAR.
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ONE WARNING - THE BLOCK DRAW ROUTINE
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(LINE 9000) WRITES DIRECT TO THE SCREEN
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AND COLOR MEMORIES, AND THE X, Y, AND
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BLOCK# VALUES ARE NOT RANGECHECKED. IF
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YOU PASS VALUES OUTSIDE THE LEGAL RANGE,
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YOU WILL EITHER WRITE TO THE WRONG PLACE
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OR PRODUCE AN ILLEGAL QUANTITY ERROR.
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IF YOU ARE PROGRAMMING IN SOME OTHER
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LANGUAGE, THE DEMO SHOULD STILL BE
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USEFUL TO YOU IN TERMS OF SHOWING WHAT
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SHOULD HAPPEN WHEN IN ORDER TO DISPLAY
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BLOCKS.
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IF YOU NEED TO HAVE NORMAL TEXT AND
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BLOCKS ON SCREEN AT THE SAME TIME, THE
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BEST WAY TO GO ABOUT IT IS TO PRESERVE
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THE NORMAL CHARACTERS THAT YOU WILL
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NEED WHEN YOU EDIT THE SET. IF YOU DON'T
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CHANGE THE FIRST 16 BLOCKS DOWNLOADED
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FROM ROM, YOU WILL BE ABLE TO PRINT THE
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FIRST 64 CHARACTERS NORMALLY AND STILL
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HAVE 48 BLOCKS (# 16-63) AVAILABLE.
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5 LIMITATIONS
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YOU WILL HAVE NOTICED BY NOW THAT
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YOU DON'T SEE TEXT AND BLOCKS AT THE
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SAME TIME IN THE EDITOR. THIS IS BECAUSE
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I'M TOO LAZY TO DO THE SORT OF INTERRUPT
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DRIVEN ROUTINE THAT WOULD BE NEEDED TO
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SWITCH FROM RAM TO ROM SETS IN MID
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SCREEN, AND SINCE THIS IS AN EDITOR
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THERE IS NO CERTAINTY THAT THE RAM SET
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CURRENTLY BEING USED WILL CONTAIN ANY
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PARTICULAR CHARACTER. AHAH! YOU WILL
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SAY - WHAT DOES HE USE TO PRODUCE THE
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EDIT DISPLAY? THE ANSWER IS THE LAST 4
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CHARACTERS IN THE SET. CHARACTERS 252-
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255 ARE SET TO THE PROPER SHAPES TO
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DISPLAY SOLID BLOCKS OF ALL 4 COLORS
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WHEN THE ROM SET IS DOWNLOADED. THE
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RESULT IS THAT IF YOU GO TO BLOCK #63
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AND START EDITING IT, VERY PECULIAR
|
THINGS HAPPEN TO THE EDIT DISPLAY.
|
NOTE THAT THIS DOES NOT AFFECT EITHER
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THE ACTUAL BLOCK DISPLAYED ON THE RIGHT,
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OR THE SET IN MEMORY (BEYOND THE EDIT
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CHANGES THEMSELVES). WHAT THIS ALL MEANS
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IS THAT YOU WILL HAVE TO LEAVE #63 TO
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LAST, AND ALSO THAT IF YOU LOAD A SET
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FROM SOME OTHER SOURCE YOU WILL WANT TO
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GO TO #63 FIRST AND CHANGE IT TO THE
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EDIT SHAPES.
|
I'D BE INTERESTED IN HEARING ANYTHING
|
YOU COME UP WITH IN THE WAY OF BUGS,
|
QUESTIONS, SUGGESTIONS,ETC. I WOULD LOVE
|
TO SEE ANY APPLICATIONS YOU COME UP
|
WITH. I WILL GUARANTEE AN (ATTEMPTED)
|
ANSWER TO ANY QUESTIONS SENT WITH A
|
SASE. MY ADDRESS IS:
|
HENRY VANDERBILT
|
804 PARKER ST.
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BOSTON,MA. 02120
|
I CAN OCCASIONALLY BE REACHED BY
|
PHONE AT 617 442-5295. I CAN HANDLE
|
XMODEM FILE TRANSFERS AT 300 BAUD.
|
@ Using the Forth Assembler
|
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