| Paradigm | imperative,algorithmic |
|---|---|
| Developer | Matsushita Communication Industrial Co., Ltd. |
| First appeared | 1981; 44 years ago (1981) |
| Stable release | 5.0 |
| OS | Matsushita JR series |
| Dialects | |
| BASIC | |
| Influenced by | |
| MicrosoftBASIC | |
| Influenced | |
| None | |
JR-BASIC is a dialect of theBASICprogramming language running on theMatsushita JR series of microcomputers.[1]
Although it's its own dialect, it was designed to be mostly compatible withMicrosoftBASIC. Since it was developed for low-cost entry-level machines, it featured as few functions as possible, in order to save computer resources. Nevertheless, theinterpreter was intended to be compact and efficient, with a feature-rich screen editor supporting direct execution of BASIC instructions.
Commands were input bykeywords[2] - by pressing a combination of control and alphabet keys, a full command word would be entered. This was faster and more comfortable than typing words letter by letter, as the computer keyboard was poor (chiclet keyboard).
JR-BASIC 1.0 is the original version present on the JR-100 computer, released in 1981.[3]
| Constants | Integer (-32767 to +32767);Hexadecimal;String |
|---|---|
| Integervariables | Alphabet or alphabet + number (ex:A,B1) |
| String variables | Alphabet + $ (ex:D $, W $); Up to 32 characters |
| Arrays | One dimension (ex:E (5)); Two dimensions (ex:F (X, Y)) |
| Calculations | Addition (+), Subtraction (-), Multiplication (*), Division (/), Remainder (MOD) |
| Commands andStatements | AUTO,BEEP,CLEAR,CLS,CONT,DATA,DIM,END,FIND,FOR-NEXT,GOSUB-RETURN,GOTO,HCOPY,IF-THEN,INPUT,LET,LIST,LLIST,LOAD,LOCATE,LPRINT,MLOAD,MSAVE,NEW,OPTION,PICK,POKE,PRINT,READ,REM,RESTORE,RUN,SAVE,STOP,VERIFY |
| Functions | ABS,ASC,CHR$,FRE,FLD,HEX$,HPOS,VPOS,LEFT$,LEN,MID$,MOD,PEEK,RIGHT$,RND,SGN,SPC,TAB,USR,VAL |
| Line numbers | 1 to 32767 |
Key combinations allowed the user to enter commands and control the onscreen basic interpreter.[2]
| Standard input key | Control mapping |
|---|---|
| 1 | (HOME) |
| 2 | VERIFY |
| 3 | SAVE |
| 4 | LOAD |
| 5 | (DELETE) |
| 6 | (←) |
| 7 | (↓) |
| 8 | (↑) |
| 9 | (→) |
| 0 | (INSERT) |
| – | (RUBOUT) |
| Q | GOSUB |
| W | RET |
| E | END |
| R | RUN |
| T | THEN |
| Y | LOCATE |
| U | IF |
| I | INPUT |
| O | OPTION |
| P | PRINT |
| A | AUTO |
| S | STOP |
| D | DIM |
| F | FOR |
| G | GOTO |
| H | POKE |
| J | RND ( |
| K | READ |
| L | LIST |
| ; | CHR $ ( |
| : | REM |
| Z | (L.INS) |
| X | (CANCEL) |
| C | (BREAK) |
| V | (GRAPH) |
| B | HCOPY |
| N | NEXT |
| M | CLS |
| , | DATA |
| . | PEEK ( |
The JR-200 model, released in 1983,[4] came with JR-BASIC 5.0 that added extended functionally like graphical commands such asCOLOR, (which selected character color, background color and display mode) andPLOT which permitted direct addressing of the low resolution graphics mode (64×48, usingtext semigraphics characters, which represented pixel blocks that used one-quarter of each character). Eight colors were available for the background and foreground use: blue, red, magenta, green, cyan, yellow, white and black. By re-programming a part of the character-set a limited high resolution graphics mode was achievable with a resolution of 256×192.