[Coco] Re: EDITEX (A better edit for coco3.rom)

[Albert Stinger]

Maybe the picture will be the "BSD Devil"?

"Albert Stinger" <albertstinger24 at canada.com> 
wrote in message news:d23u4l$3c4$1 at sea.gmane.org...

> Hi all,

>

> I can't believe how EDITEX patched into the roms so nice.

> It's like it was meant to be there. Take a look and see

> how EDITEX uses up the unused portions in a coco3.rom.

>

> ***************************************************************************

> * EDIT - if you enter EDIT [LINE NUMBER] in the CONSOLE you come here.

> *

> * A/NO

> * 8533               00100         ORG     $8533

> * 8533 BD   A064     00110 START   JSR     $A064

> *           0000     00120         END

> *

> * 00000 TOTAL ERRORS

> *

> * START   8533

> *

> ***************************************************************************

> * To use the enhanced edit command enter EDITEX from the OK prompt in 

> BASIC

> * The checking for enhanced edit command This code will be patched

> * into the memory starting at $A064 - $A071 which is 12 bytes.

> *

> * A/NO

> * A064               00100         ORG     $A064

> * A064 BD   AF67     00110 START   JSR     $AF67

> * A067 24   03       00120         BCC     CHKED

> * A069 7E   89AE     00130         JMP     $89AE

> * A06C 32   64       00140 CHKED   LEAS    $04,S

> * A06E C6   01       00150         LDB     #1

> * A070 20   17       00160         BRA     $A089

> *           0000     00170         END

> *

> * 00000 TOTAL ERRORS

> *

> * CHKED   A06C

> * START   A064

> *

> ***************************************************************************

> * To use the enhanced edit command enter EDITEX from the OK prompt in 

> BASIC

> * The checking for enhanced edit command This code will be patched

> * into the memory starting at $A089 - $A092 which is 10 bytes.

> *

> * A/NO

> * A089               00100         ORG     $A089

> * A089 F7   FF90     00110 START   STB     $FF90

> * A08C F7   FFDF     00120         STB     $FFDF

> * A08F 7E   C405     00130         JMP     $C405

> *           0000     00140         END

> *

> * 00000 TOTAL ERRORS

> *

> * START   A089

> *

> ***************************************************************************

> * To use the enhanced edit command enter EDITEX from the OK prompt in 

> BASIC

> * The checking for enhanced edit command This code will be patched

> * into the memory starting at $C405 - $DFFF which is 7162 bytes.

> *

>        ORG $C405       * PATCH $C405-$DFFF

> EDITEX  ANDA #$DF       * MAKE UPPER CASE

>        CMPA #'E        * SYNTAX CHECK

>        BEQ CHK2        * OK

> CHK1    JMP $B277       * SYNTAX ERROR

> CHK2    JSR $009F       * GET NEXT INPUT

>        ANDA #$DF       * MAKE UPPER CASE

>        CMPA #'X        * SYNTAX CHECK

>        BNE CHK1        * SYNTAX ERROR EXIT WITH ERROR MESSAGE

>

> After the syntax check will be the entry point for the new edit commands.

> My vision is it will have these commands:

>

>    1. Arrows Keys - Lets you scroll through the BASIC program in memory.

>    2. Insert           - Lets you insert characters at current cursor 

> position.

>    3. Over-Strike   - Lets you replace characters at current cursor 

> position.

>    4. EDIT            - Lets you use the EDIT command on current line 

> number.

>    5. QUIT            - Quits EDITEX

>

> Another interesting tidbit about EDITEX. When you press CTRL and ALT 

> during RESET

> the picture that you'll see is the bytes for EDITEX. It should be 

> interesting to see what

> the picture for EDITEX will look like. My guess is it could be anything. 

> Who knows maybe

> it'd be a picture of Jesus Christ or the Virgin Mary. Who knows could be 

> anything?

>

> Albert Stinger

>

>

>

>

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