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Altair BASIC 3.2 (4K Edition)

Altair BASIC 3.2 (4K) - Annotated Disassembly. This is a work in progress, about 90% complete]. Here is a complete annotated disassembly of Altair BASIC 3.2 (4K). I have faithfully followed the program order, and the code naturally divides into three sections - the Interpreter, the Maths Package, and Initialisation. Each of these sections is more-or-less logically subdivided into a number of subsections. Start, SyntaxCheck, NextChar, OutChar, CompareHLDE, FTestSign, PushNextWord. No code in this section].

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Altair BASIC 3.2 (4K Edition) | altairbasic.org Reviews

<META> DESCRIPTION

Altair BASIC 3.2 (4K) - Annotated Disassembly. This is a work in progress, about 90% complete]. Here is a complete annotated disassembly of Altair BASIC 3.2 (4K). I have faithfully followed the program order, and the code naturally divides into three sections - the Interpreter, the Maths Package, and Initialisation. Each of these sections is more-or-less logically subdivided into a number of subsections. Start, SyntaxCheck, NextChar, OutChar, CompareHLDE, FTestSign, PushNextWord. No code in this section].

<META> KEYWORDS

1 1 the interpreter

2 interpreter explanation

3 section

4 base

5 size

6 key functions

7 restarts

8 keyword tables

9 utility functions

10 tokenize inputline

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1 the interpreter,interpreter explanation,section,base,size,key functions,restarts,keyword tables,utility functions,tokenize inputline,terminal i/o,list handler,list,for handler,execution,execnext exec,more utility functions,assigning variables,if handler

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Altair BASIC 3.2 (4K Edition) | altairbasic.org Reviews

https://altairbasic.org

Altair BASIC 3.2 (4K) - Annotated Disassembly. This is a work in progress, about 90% complete]. Here is a complete annotated disassembly of Altair BASIC 3.2 (4K). I have faithfully followed the program order, and the code naturally divides into three sections - the Interpreter, the Maths Package, and Initialisation. Each of these sections is more-or-less logically subdivided into a number of subsections. Start, SyntaxCheck, NextChar, OutChar, CompareHLDE, FTestSign, PushNextWord. No code in this section].

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altairbasic.org

1

Altair BASIC 3.2 (4K) - Disassembly

http://altairbasic.org/int_dis_8.htm

Although FOR indicates the beginning of a program loop, the handler only gets called the once. Subsequent iterations of the loop return to the following statement or program line, not the FOR statement itself. First we call LET to assign the initial value to the variable. On return, HL points to the next bit of program (the TO clause with any luck). Stick program ptr onto stack. We lose the return address, since we don't need it as this function conveniently falls into ExecNext by itself. MVI C, 08.

2

Untitled Document

http://altairbasic.org/int_ex.htm

The BASIC Interpreter - Explained. How Basic arranged memory. Here's how Basic arranged the 4K of memory available to it. Most of memory was of course occupied by BASIC itself - from 76% to 82% depending on what optional inline functions had been selected during initialisation - with the remaining few hundred bytes at the top for the program code, space for variables, and of course stack space. Lets consider the blocks of memory that follow Basic's own code in turn :. Consider this line of input :. The f...

3

Altair BASIC 3.2 (4K) - Disassembly

http://altairbasic.org/int_dis_12.htm

Assigns a value to a variable. First call GetVar. This returns the address of the variable's value in DE, allocating space for it if it doesn't already exist. Check that '=' follows the variable name. Assigns the result of the BASIC expression at HL to the variable pointed to by DE. Preserve variable address on stack and get the variable value into FACCUM. Swap (SP) and HL, so HL now holds the address of the variable's value and the program ptr is on the stack. SHLD PROG PTR TEMP.

4

Altair BASIC 3.2 (4K) - Disassembly

http://altairbasic.org/int_dis_3.htm

13 Error Codes and Globals. A table of two-character error codes for the 12 errors. Invalid in Direct mode. Buffer for a line of input or program, 73 bytes long. The line buffer is prefixed with this comma. It's here because the INPUT handler defers to the READ handler, which expects items of data (which the line buffer is treated as) to be prefixed with commas. Quite a neat trick! A bunch of variables BASIC needs to run. A flag used by Read. To determine whether the INPUT or READ keyword invoked it.

5

Altair BASIC 3.2 (4K) - Disassembly

http://altairbasic.org/math_dis_11.htm

211 SQR - Optional Function #1. As mentioned elsewhere, during initialisation the user was asked if he wanted the SIN, RND, and SQR functions to be available. The reason for this was to give the user a chance to save a bit more memory for their programs, by having Basic reclaim the memory used by those functions. That is why these functions are at the very top of the program code. We use Newton's method to get a close approximation to the square root. Return immediately if FACCUM is zero, since SQR(0)= 0.

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Altair BASIC 3.2 (4K) - Annotated Disassembly. This is a work in progress, about 90% complete]. Here is a complete annotated disassembly of Altair BASIC 3.2 (4K). I have faithfully followed the program order, and the code naturally divides into three sections - the Interpreter, the Maths Package, and Initialisation. Each of these sections is more-or-less logically subdivided into a number of subsections. Start, SyntaxCheck, NextChar, OutChar, CompareHLDE, FTestSign, PushNextWord. No code in this section].

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