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--- sd:star_forth [2026/03/12 13:58] – appledog
+++ sd:star_forth [2026/03/12 16:16] (current) – appledog
@@ Line 2: / Line 2: @@
 Starting Forth is available online at [[https://www.forth.com/starting-forth/0-starting-forth/|Starting Forth Online Edition]].
+== Welcome to Star Forth
+SD/FORTH v0.5
+* 32-bit cells, subroutine-threaded
+* Outer interpreter with TIB, word parser, dictionary search, number parsing
+* Stack primitives with underflow protection
+* 17 built-in words: BYE, .S, CR, ., DUP, DROP, SWAP, OVER, +, -, *, /, MOD, EMIT, DEPTH, WORDS, PROMPT
+* Decimal, hex ($), binary (%), explicit decimal (#) number input
+* Negative numbers with - prefix
+* Paste-friendly '> ' stripping
+Next phases when you're ready:
+TODO:
+* : and ; (colon definitions) — this is where FORTH becomes a real language
+* 32-bit number printing (currently . only shows low 16 bits)
+* Control flow — IF/THEN/ELSE, DO/LOOP, BEGIN/UNTIL
+* Memory words — @, !, C@, C!, HERE, ALLOT, ,
+* String I/O — .", TYPE, ACCEPT
+* Save/load dictionary images
 == FIG-FORTH
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 This list includes implementations for: the 1802, 6502, 6800, 68000, 6809, 8088, 9900, the Alpha Micro, Apple II, Eclipse, IBM-PC, Nova, Pace, the PDP-11, and the VAX.
-The point being proven, FORTH is out there with copious amounts of code in various architectures. It was thus easy to get a kind of FORTH running on the SD-8516. I quickly became obsessed with it.
+The point being proven, FORTH is out there with copious amounts of code in various architectures. It was thus easy to get a kind of FORTH running on the SD-8516. I quickly became obsessed with it. It took quite a while to iron out all the stack bugs.
 == Why
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 Several official Atari 7800 console games were developed in Forth as well. It was surprisingly common for quick ports and prototypes. Games like Karateka, Hat Trick, and Worms were written in Forth. Notably the Forth source code for Worms (1983) is available on GitHub.
-The original Atari 800 Dig Dug was done in Forth. Professor Pac-Man (1983, Bally/Midway) was written in Forth. The Jupiter Ace, a home computer using FORTH instead of BASIC was released in the UK, and ports of many popular games including PAC MAN ran on the system. Bally and Midway, as well as Atari, often prototyped games in FORTH. The reason why some games are well-known to have been coded in assembly is because FORTH can define assembly routines as functions (words).
+The original Atari 800 Dig Dug was done in Forth. Professor Pac-Man (1983, Bally/Midway) was written in Forth. The Jupiter Ace, a home computer using FORTH instead of BASIC was released in the UK, and ports of many popular games including PAC MAN ran on the system. Bally and Midway, as well as Atari, often prototyped games in FORTH. The reason why some games are well-known to have been coded in assembly is because FORTH can define assembly routines as functions (words). In a 6502 Forth for example, you always write performance critical parts in assembler, as most Forth systems have an build in 6502 assembler (and if not, it's trivial to add).
+RAMBrandt (Antic Software) was written in Forth.
-RAMBrandt (Antic Software) was written in Forth. Landon Dyer who worked at Atari said that someone at Atari would often start porting a game in Forth, but then later it would be oprtimized in assembly due to speed and size concerns of the 2600 and 800--The Atari 800 had a base of 16k RAM and the 800 had, I believe, 128 bytes of RAM-- but the games game on cartridges containing 2k to 4k of ROM.
+AtariLab was written in Forth. Landon Dyer who worked at Atari said that someone at Atari would often start porting a game in Forth, but then later it would be optimized in assembly due to speed and size concerns of the 2600 and 800--The Atari 800 had a base of 16k RAM and the 800 had, I believe, 128 bytes of RAM-- but the games game on cartridges containing 2k to 4k of ROM.
 FORTH saw critical commercial success in the business world as well. RapidFile (1986, Ashton-Tate) was a flat-file database manager written in Forth. Ashton-Tate was big in databases back then (dBase III fame), so this reached business users.