BASIC Syntax Query

[Steve Crompton]

Hi Folks,

Having a bit of a play with some BASIC at the minute and I have a program with statements similar to the following:

FNB$(X,Y)=HOME$

HOME$ is previously defined as a string of characters, but X and Y appear not to be defined anywhere

My question is: what is FNB$(X,Y)=HOME$ doing? - FNB is a string variable right? .... but what is the purpose of the bracketed (X,Y)

Steve

[Steve Mastrianni]

I’m not an expert, but believe that statement defines a function B$ (subroutine of sorts) that you call with two variables, x and y. Each implementation of BASIC differs…

--Steve

Dr. Steve Mastrianni

Sent from my iPhone

On Nov 2, 2022, at 11:41 AM, Steve Crompton <ideal...@gmail.com> wrote:

Hi Folks,

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[Dave White]

It looks like FNB$ is a multi dimensional array of strings, and that assignment assigns the string value of HOME$ to array location x,y

[Dave White]

This is form BBC Basic, but will give you a push in the right direction.

http://www.riscos.com/support/developers/bbcbasic/part2/arrays.html

[Steve Mastrianni]

Ah that makes more sense!

--Steve

Dr. Steve Mastrianni

Sent from my iPhone

On Nov 2, 2022, at 2:01 PM, Dave White <mrgcm...@gmail.com> wrote:

This is form BBC Basic, but will give you a push in the right direction.

To view this discussion on the web visit https://groups.google.com/d/msgid/retro-comp/c51c075a-f6b1-4584-86e8-070949830a34n%40googlegroups.com.

[Steve Mastrianni]

Guess I missed the DEF directive which I believe does define a function. Duh.

--Steve

Dr. Steve Mastrianni

Sent from my iPhone

On Nov 2, 2022, at 5:21 PM, Steve Mastrianni <steve.ma...@gmail.com> wrote:

Ah that makes more sense!

[Nils-Arne Dahlberg]

When asking about BASIC, please state what dialect of BASIC and on what system you are using it. BASIC is not the same as BASIC, unfortunately.

/Nils-Arne

[Steve Crompton]

Hi there,

Thanks to all who helped me decipher the unfamiliar program lines in a simple BASIC program I recently discovered. As a result I was able to modify the program to work in ehBASIC.

Here is the result:

The Archimedes Spiral Hat Program - ehBASIC version running on my 68030 SBC with ACRTC Video Card driving a VGA Monitor

If anyone has any more of these interesting graphical plots - please share

Steve

[Rob Gowin]

Steve, 

WOW! You've designed a machine I've been thinking about for a while, an '030 with an ACTRC. Impressive! 

Any more details on your SBC you'd like to share? Specs like memory size, CPU speed, I/O & storage options?

-- Rob

[Steve Crompton]

System Spec.

68030 25MHz

4MB ROM

8MB Static RAM

68681 DUART

ACRTC 640x480 VGA Graphics

Tutor Monitor

ehBASIC

CP/M 68K

I also have a plug in Compact Flash board that works with most but not all CF cards for the above

Currently the system is running a MC68030RC 33MHz CPU clocked at 30MHz and XR68C681 DUART (overclocked) and operating at 230K Baud  - works fine