added screenshot, small documentation update

README.md

@@ -9,6 +9,8 @@ A project to create unencumbered open-source ROMs for use on selected retro comp
 * [license](./LICENSE) information and list of major contributors
 * [credits](./CREDITS.md) to people whose work was of great help to us
 
+![screenshot demonstrating some features](./doc/screenshot-demo.png)
+
 # Problem Statement and Motivation
 
 The copyrights of various old computer system ROMs are still alive, and together with trademarks, can present significant

doc/Extended-BASIC-TODO.md

@@ -0,0 +1,64 @@
+
+# Planned BASIC features, when V2 compatibility is reached
+
+Ideas for the future, most of them suitable for Mega65 or other power machines only
+
+* sound support
+* 2D graphics support
+* turtle graphics
+* sprite support, including collision callback
+* custom character set support
+* sprite/character design within program, in a way similar to Simons BASIC
+* joystick/mouse/lightpen/paddle commands/functions
+* matrix operations
+* `DISPOSE` with variable/array as parameter should remove the variable/array from memory
+* `BLOAD`, `BVERIFY` and `BSAVE` should have syntax compatible with BASIC V7/V10
+* it should be possible to intercept Kernal errors from BASIC (prevent `?FILE NOT FOUND ERROR IN ...`, etc.); `ON ERROR GOTO` ?
+* support for numbers in hexadecimal and binary formats
+* `CGOTO` and `CGOSUB` - computatiuonal versions, should accept expressions
+* `LABEL`, `LGOTO` and `LGOSUB` - jump to label
+* some kind of subroutines with local variable namespace, possibly loaded from disc (like in Warsaw Basic 3.2)
+* for Mega65 mode, move variables to a separate memory area, consider extending variable name length
+* `←V` (verify from tape) - if Kernal is extended to offer this feature
+* modulo function or opeerator
+* `DPEEK`, `DPOKE`, `QPEEK`, `QPOKE` - 2/4 byte `PEEK` and `POKE` variants
+* all the functions/commands accepting memory addresses should be able to access the whole Mega65 memory
+* ability to limit memory used by basic to standard 38K or to 46K (memory model switch)
+* `XOR` operator
+* `AUTO` - line auto numbering
+* `RENUMBER` for chanign the line numbers
+* `IF ... THEN ... ELSE`, `BEGIN ... BEND`
+* consider `BOOT` command
+* possibly some commands for creating menus and dialog boxes
+* more configurable `INPUT`
+* `PRINT USING`, `PRINT AT(x, y)`, `PRINT CENTRE`
+* `CURSOR` command from BASIC V10
+* `RESTORE` should accept lline number as argument
+* hex/dec conversion functions
+* `DELETE` command to delete several BASIC lines, as in BASIC V10
+* `FOR` loop should accept integer variable as index
+* `FETCH`, `STASH`, `SWAP` - REU support
+* `DMA` command for Mega65
+* geoRAM support
+* `GO 64` / `GO 65` should enable/disable C64 compatibility mode on Mega65
+* `NSYS` for Mega65 - native `SYS` for Mega65, should not switch to C64 compatibilty mode
+* `DO ... LOOP`, `DO ... UNTIL`, `DO ... WHILE`, `EXIT`
+* `SEEK#` to read-and-forget n bytes
+* `RECORD#` command from BASIC V10
+* `GETKEY` from BASIC V10
+* `HELP` command from BASIC V7/V10
+* function to find substring position
+* `WINDOW` command from BASIC V7
+* functions to return cursor position
+* `TRAP` and `RESUME`
+* `SET DEF` and `SET DISK` from BASIC V10
+* `SLEEP` from BASIC V10
+* `TRON` / `TROFF` - program tracing
+* `TYPE` command from BASIC V10
+* `RUN` should be able to run program from device, as in BASIC V10
+* `PAGE` and `DELAY` commands from Simons BASIC, or something similar
+* `DUMP` command from Simons BASIC, or something similar
+* function to insert a substring starting from given position
+* function to generate string of n duplicated characters
+* function to retrieve fractional part of a number
+* command to fill text screen area with a character, inverse screen area, scroll, or change fg/bg color of screen area

doc/Extended-BASIC.md

@@ -91,67 +91,3 @@ Clears the screen content.
 ### `DISPOSE`
 
 Runs the garbage collector - disposes outdated strings.
-
-# Planned BASIC features, when V2 compatibility is reached
-
-Ideas for the future, most of them suitable for Mega65 or other power machines only
-
-* sound support
-* 2D graphics support
-* turtle graphics
-* sprite support, including collision callback
-* custom character set support
-* sprite/character design within program, in a way similar to Simons BASIC
-* joystick/mouse/lightpen/paddle commands/functions
-* matrix operations
-* `DISPOSE` with variable/array as parameter should remove the variable/array from memory
-* `BLOAD`, `BVERIFY` and `BSAVE` should have syntax compatible with BASIC V7/V10
-* it should be possible to intercept Kernal errors from BASIC (prevent `?FILE NOT FOUND ERROR IN ...`, etc.); `ON ERROR GOTO` ?
-* support for numbers in hexadecimal and binary formats
-* `CGOTO` and `CGOSUB` - computatiuonal versions, should accept expressions
-* `LABEL`, `LGOTO` and `LGOSUB` - jump to label
-* some kind of subroutines with local variable namespace, possibly loaded from disc (like in Warsaw Basic 3.2)
-* for Mega65 mode, move variables to a separate memory area, consider extending variable name length
-* `←V` (verify from tape) - if Kernal is extended to offer this feature
-* modulo function or opeerator
-* `DPEEK`, `DPOKE`, `QPEEK`, `QPOKE` - 2/4 byte `PEEK` and `POKE` variants
-* all the functions/commands accepting memory addresses should be able to access the whole Mega65 memory
-* ability to limit memory used by basic to standard 38K or to 46K (memory model switch)
-* `XOR` operator
-* `AUTO` - line auto numbering
-* `RENUMBER` for chanign the line numbers
-* `IF ... THEN ... ELSE`, `BEGIN ... BEND`
-* consider `BOOT` command
-* possibly some commands for creating menus and dialog boxes
-* more configurable `INPUT`
-* `PRINT USING`, `PRINT AT(x, y)`, `PRINT CENTRE`
-* `CURSOR` command from BASIC V10
-* `RESTORE` should accept lline number as argument
-* hex/dec conversion functions
-* `DELETE` command to delete several BASIC lines, as in BASIC V10
-* `FOR` loop should accept integer variable as index
-* `FETCH`, `STASH`, `SWAP` - REU support
-* `DMA` command for Mega65
-* geoRAM support
-* `GO 64` / `GO 65` should enable/disable C64 compatibility mode on Mega65
-* `NSYS` for Mega65 - native `SYS` for Mega65, should not switch to C64 compatibilty mode
-* `DO ... LOOP`, `DO ... UNTIL`, `DO ... WHILE`, `EXIT`
-* `SEEK#` to read-and-forget n bytes
-* `RECORD#` command from BASIC V10
-* `GETKEY` from BASIC V10
-* `HELP` command from BASIC V7/V10
-* function to find substring position
-* `WINDOW` command from BASIC V7
-* functions to return cursor position
-* `TRAP` and `RESUME`
-* `SET DEF` and `SET DISK` from BASIC V10
-* `SLEEP` from BASIC V10
-* `TRON` / `TROFF` - program tracing
-* `TYPE` command from BASIC V10
-* `RUN` should be able to run program from device, as in BASIC V10
-* `PAGE` and `DELAY` commands from Simons BASIC, or something similar
-* `DUMP` command from Simons BASIC, or something similar
-* function to insert a substring starting from given position
-* function to generate string of n duplicated characters
-* function to retrieve fractional part of a number
-* command to fill text screen area with a character, inverse screen area, scroll, or change fg/bg color of screen area