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Questions tagged [basic]

For questions about BASIC, a lightweight, high-level programming language favored in retro computer systems.

4
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3answers
421 views

How can I view BASIC code hidden by SYS?

I ran a validation of an old disk, and it turns out this ruined a game (won't load) and deleted my old high score list on David's Midnight Magic. I would like to edit the code to get the high score ...
6
votes
4answers
425 views

Early Basic memory management

Can anyone verify or correct my memory here? Long ago, I had access to a Commodore PET which I think had 8kB of memory. Also slightly less long ago, I had a Commodore 64 with its "elephatine" 64kB. ...
10
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4answers
2k views

What are the rules for Applesoft BASIC formatting for code?

What are the rules for Applesoft BASIC formatting for code? I've been doing some BASIC coding and noticed that: 10 input "some question?"; name$ Will be reformatted as: 10 INPUT "some question?";...
13
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1answer
428 views

Origin/source of “One Line” one-key game

Circa 1985 in our school BBC Micro lab, we wasted much time playing a tiny type-in game that looked a bit like this: The playfield was filled with a random arrangement of asterisks, and the player ...
4
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0answers
129 views

DTSS software list?

I'm continuing my effort to track down the original author of the early game Chase. I have pretty much concluded it was written on the GE-635 running Dartmouth Time Sharing System (DTSS) and Dartmouth ...
14
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7answers
3k views

What caused the demise of BASIC/BASICA in the late 1980's?

While not strictly adhered to, this is somewhat of a generalization of computer listings found in the more popular magazines of the time - BYTE, Kilobaud, PC Computing, etc. This explains the ...
5
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5answers
741 views

New 6502 BASICs?

I sort of "have a thing for BASIC" right now, which has led to a couple of great exchanges here in RSE about the variations "back in the day". I'm wondering if anyone is aware of other modern BASICs ...
6
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1answer
156 views

Differences between 4k, 8k and Extended Altair BASIC?

Various histories state that there were at least three versions of Altair BASIC, 4k, 8k and Extended - plus modifications like Disk. I've found some listings of the 4k, but does anyone have a short ...
10
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1answer
476 views

BBC/Acorn BASIC, what made it so fast?

As I look over old versions of BASIC trying to piece together their history, I come across repeated indications that BBC Basic was really fast. One list puts it running the Ahl benchmark (for all its ...
8
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2answers
2k views

Did Microsoft BASIC ever use Z80 only instructions?

Did Microsoft BASIC (or any of the OEM versions) ever use Z80 only instructions? For the purposes of this question I'm ignoring the equivalent of BIOS I/O layers which OEMs would have provided.
5
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2answers
317 views

What books did schools use to teach BASIC?

What books would have been used to teach school aged kids BASIC in a classroom setting back when BASIC was in common use? 8-Bit computers commonly came with tutorials to learn BASIC, like A Touch of ...
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2answers
507 views

Why does this BASIC program generate variables for the numbers 0 to 4?

On pages 150 to 154 of William Tang's (1982) Spectrum Machine Language for the Absolute Beginner, there are these lines of code. (Note GOTO 9000 is the first non-REM statement in the program). 9000 ...
8
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2answers
347 views

ZX BASIC REM statement overhead

Since my other question has been answered and has given me a way to do high-precision timing, I've been experimenting with it a bit. The first thing I did was write a simple benchmark using the FRAMES ...
17
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4answers
1k views

Uptime in ZX BASIC

How can I obtain the uptime of a Sinclair ZX Spectrum machine (ZX48, ZX128, or Pentagon clone) via their BASIC interpreter? Specifically, the same value used by RANDOMIZE 0 to seed its PRNG. I would ...
16
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4answers
2k views

Understanding INKEY$ in ZX BASIC

The ZX BASIC Manual gives the following little program to demonstrate how INKEY$ works: 10 IF INKEY$ <> "" THEN GO TO 10 20 IF INKEY$ = "" THEN GO TO 20 30 PRINT INKEY$; 40 GO TO 10 While I ...
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6answers
3k views

ZX Spectrum tokenisation

The BASIC used in the early ZX Spectrum (and also its ZX predecessors) had this weird thing where every single BASIC token was printed onto the keyboard, and for example PRINT or LOAD were entered by ...
18
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8answers
2k views

Which BASIC interpreters support techniques for hybrid programming in Assembly?

It was common with Commodore BASIC (and others, I'm sure) to have machine language encoded in BASIC programs using POKEs or READ/DATA. This was needed for both performance and to access certain ...
7
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3answers
1k views

Was Family BASIC for the NES/Famicom powerful enough to create full games and applications?

"Family BASIC or Famicom BASIC is the consumer product for programming Nintendo's Family Computer video game console of Japan." wikipedia I can't seem to find much info about Family BASIC ...
17
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3answers
712 views

Was the design of MS-BASIC for 6502 based on MS-BASIC for 8080?

Looking through the source code of the 6502 MS-BASIC, certain parts of it seem more reminiscent of how things would be done on the 8080, then on how they should be done on the 6502. Code to find a ...
6
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1answer
301 views

Determine Character Encoding used on HP 9000 Model 310 running BASIC 5.1

With the help of this community, I was able to copy and emulate a HP9133 HD using Hpdir and Hpdrive. Now, I want to edit, or at the bare minimum, read the programs on the HD. I have extracted the ...
9
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3answers
538 views

C64 BASIC: How to suppress the '?' sign when using the INPUT command?

When you are getting INPUT in Commodore BASIC it always adds a question mark at the end of the string you want to show. Is there a way to suppress the question mark when using the INPUT command?
9
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2answers
444 views

Why does this BASIC program keep restarting?

Here is a BASIC program for the Commodore 64, which should load the LIB file from the disk, and then stop. Yes? 5 PRINT "LOADING..." 10 LOAD "LIB",8,1 20 STOP the LIB file is 102 bytes long and is ...
6
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2answers
944 views

C64: Strange Behaviour on Control Port 1

I wrote this little Basic program to get Joystick input from Control Port 1. I know that this method is very strange and is better for keyboard input. 20 get a$ 30 if a$="" then 20 32 b=asc(a$) 33 ...
24
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1answer
3k views

C64: Why is POS(π) faster than POS(0)?

According to this article: german C64 Wiki article about the POS() command POS(π) is 20 % faster. Although in my experience it is ...
2
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2answers
251 views

C64, basic v2, DATA strange behavior

I have the following code line: 0DATA"-+-+-" Here "\" and "/" are the ASC codes 205 and 206. I get a syntax error: ?SYNTAX ERROR IN 0 READY. As I can remember, there was same special in the ...
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3answers
295 views

Copying disk image from HP 9122D drive

I have a HP 9122D (EDIT: its actually a 9133) combo disk drive connected to an HP 9000 model 310 computer running Basic 4.0. This setup is used to control a few machines. The hard drive is getting ...
3
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1answer
163 views

Simulate Repeat/Until in BASIC, and on a single line?

Is there a way to simulate a Repeat/Until loop in a BASIC language without it, and without using a GOTO statement? For BASIC languages with command separators, can this be done on a single line ...
12
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4answers
627 views

How to use BASIC after “LOAD ”$",8 on the C64

After loading a file list from a floppy disk it is hard to program in BASIC because the file list is interpreted as BASIC lines. For example there can be 20 lines with the number 1, because 20 files ...
96
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2answers
17k views

How did Commodore's anti-Microsoft Easter Egg work?

A couple years ago the Toronto PET Users Group published an article (The Great Commodore/Microsoft Easter Egg War, on p. 7) about a newly discovered anti-Microsoft Easter Egg that Commodore hid in the ...
8
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0answers
449 views

Looking for a specific BASIC music program from the 80s

When I was a kid, we had a PC-XT with a lot of GW-Basic programs on it. I am trying to track down one in particular -- it was a music player of sorts. A menu (all monochrome text as I recall) and you ...
13
votes
1answer
2k views

Was the first ARM “processor” a BBC BASIC program?

The best background I have found so far on the early development of the ARM processor at Acorn comes from this interview with Steve Furber. The interview does not mention the development of the first ...
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3answers
2k views

What “Write your own RPG/Adventure game” books were available for 8-bit computers? [closed]

During the 70s and 80s there were a number of books about how to write your own games for 8-bit computers, usually in BASIC. Three examples of these books are How to Create Adventure Games by ...
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7answers
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What implementations of BASIC had a robust flood fill operator?

When I learned BASIC on Elektronika BK, I got fascinated with the flood fill (PAINT) operator: how does it know to get to all nooks and crannies of the shape to fill? I've devised an algorithm, tried ...
9
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1answer
113 views

cbm prg studio for the Amstrad

CBM prg studio is brilliant. I have searched Google for a version (or something similar) for the Amstrad CPC 464, to no avail. Does anyone know of one?
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1answer
3k views

What computer system is this from 1984 Doctor Who?

In the 1980s, the popular BBC science fiction series Doctor Who used some real computer system(s) to display impressive (for the time, OK, maybe not!) graphics. They actually ran the software real-...
17
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2answers
918 views

Can a USR command damage a ZX Spectrum?

I recently came across this magazine snippet; specifically this section: Aprovechamos para avisar a los usuarios del Inves, que nos ha Ilegado el rumor de que haciendo: BORDER 5 RANDOMIZE USR 4665 ...
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29answers
8k views

What early computers had excellent BASIC (or other language) at bootup? [closed]

What early computers had an excellent programming language? I know for many of them, the interpreted language was used as much or more for an operating system as language. Definition of terms early ...
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5answers
6k views

Can a PET 2001 be physically damaged from BASIC?

In the early 1980s my primary school was the proud owner of a Commodore PET 2001. There was a commonly held belief among the young geek fraternity that there existed a BASIC command—perhaps a ...
12
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3answers
3k views

MSX Assembly/Basic programming documentation

I'd like to try to create software (and maybe simple games) for the MSX standard. I know I have two ways to do so, either I use MSX Basic or Z80 assembly. I think that Z80 assembly is more powerful ...
11
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1answer
214 views

What is the format of the syntax tables in Apple II Integer BASIC?

In Paul Santa-Maria's disassembly of Integer BASIC (text version), you can see the syntax table split into two parts, SYNTABL and SYNTABL2. I've seen references to the tokens being stored in reverse ...
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2answers
476 views

Is it possible to crash the Apple II using only the Apple II Basic REPL?

Prerequisites: 1) Apple II 2) Basic Prompt Using only the instructions provided, can you crash the Apple II? I'm curious if this is even possible because I have only ever programmed the ...
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0answers
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In search of… SeaWar — NOT Battleship!

Hopefully, sufficient background Many years ago (40-45), I used to play "Sea War" on a good sized time-share system. It was a text/adventure war game between a couple remote players, played over a ...
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4answers
2k views

Did the LET statement actually do anything in 8-bit Microsoft BASICs?

I know the LET statement was available in AppleSoft and other Microsoft 8-bit BASICs back in the day, but I can't think of a time where I actually used it. Frankly, I get the impression that it was ...
13
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1answer
339 views

How to use virtual cassettes with Matthew Reed's TRS-80 Model III emulator? (TRS32)

I'm fooling around with Matthew Reed's TRS-80 Model 1/III/4 emulator for Windows (TRS32) and am have trouble using virtual cassettes. I am using it to emulate a Model III with Level II BASIC. I have ...
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4answers
1k views

Why were early versions of BASIC different?

Most major computer manufacturers/distributors in the 70's and 80's included BASIC with their computers. Some (as answers to this great question have detailed: Why was BASIC built into so many ...
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18answers
15k views

Why was BASIC built into so many operating systems?

There are a lot of retro-computers with BASIC as an integral part of the operating system. The IBM 5100 was one of the first computers with a separate memory space for BASIC, followed by the Commodore ...