JR-BASIC
Paradigm | imperative, algorithmic |
---|---|
Developer | Matsushita Communication Industrial Co., Ltd. |
First appeared | 1981 |
Stable release | 5.0
|
OS | Matsushita JR series |
Dialects | |
BASIC | |
Influenced by | |
Microsoft BASIC | |
Influenced | |
None |
JR-BASIC is a dialect of the BASIC programming language running on the Matsushita JR series of microcomputers.[1]
Although it's its own dialect, it was designed to be mostly compatible with Microsoft BASIC. Since it was developed for low-cost entry-level machines, it featured as few functions as possible, in order to save computer resources. Nevertheless, the interpreter was intended to be compact and efficient, with a feature-rich screen editor supporting direct execution of BASIC instructions.
Commands were input by keywords[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
[edit]JR-BASIC 1.0 is the original version present on the JR-100 computer, released in 1981.[3]
Specifications
[edit]Constants | Integer (-32767 to +32767); Hexadecimal; String |
---|---|
Integer variables | 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 and Statements | 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 |
Keyboard commands
[edit]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 (
|
JR-BASIC 5.0
[edit]The JR-200 model, released in 1983,[4] came with JR-BASIC 5.0 that added extended functionally like graphical commands such as COLOR
, (which selected character color, background color and display mode) and PLOT
which permitted direct addressing of the low resolution graphics mode (64×48, using text 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.
See also
[edit]References
[edit]- ^ "JR-100".
計算 機 室 . May 28, 2017. - ^ a b "Operating Instructions - Personal Computer JR-100U" – via Internet Archive.
- ^ "OLD-COMPUTERS.COM : The Museum MATSUSHITA National JR 100". www.old-computers.com.
- ^ "Creative Computing Magazine (May. 1983) Volume 09 Number 05". May 10, 1983 – via Internet Archive.