I enjoyed reminiscing about BASIC when it recently turned 50, on May 1 2014. I learned more about the events surrounding the creation of Dartmouth BASIC from the Dartmouth web pages and especially from interview videos with co-inventors John Kemeny and Thomas Kurtz. Given my development of ACE BASIC for the Amiga in the mid-90s, the BASIC programming language has a special place in my heart. More about ACE shortly. My first experience with BASIC and programming in general was in 1977, in my second year of high school (Norwood High). Our class marked up a deck of cards (in pencil) with a BASIC program and submitted them to Angle Park Computing Centre. A week or two later I remember receiving a printout of a partial run, showing an ASCII plot of some function (a deceleration curve I think) tantalisingly cut short by an error, the details of which I don’t recall.
At the time I thought that was an interesting experience but set it aside. As I described here, in 1978, the school bought a PDP-11 and installed it in an air-conditioned room complete with a card reader, printer, and terminals. I remember seeing the machine for the first time, gawking in wonder through the glass window in the door to the room. 
Apart from a small amount of class-time exposure to the machine, I became a “computer monitor”, assigned on a roster to be there while others used the computer, given a modicum of responsibility for looking after the machine (e.g. card reader or printer problems, booting) but I didn’t learn too much more about the PDP-11 that way.
What really hooked me, was eventually being allowed to use the terminals (pictured at right) and the interactive BASIC programming that entailed. There was plenty of competition for terminal time! One of the first interactive programs I wrote was a simple guess-the-number game in which the user was told whether a guess was less or greater than the number the machine was “thinking” of. It seems trivial now but that experience of interacting with an “artificial intelligence” (as it seemed to me at the time) was intoxicating and this has stayed with me. Some fellow students started playing around with machine language on the PDP-11; that was a little beyond me at the time but an understanding of that level would become important for me later.
In the late ’70s, Tandy had a computer store in Gawler Place, Adelaide. I used to catch a bus into town on Friday nights, pull up a chair at a TRS-80 Model 1 on display and sit there for an hour or two typing in BASIC source code for games from a book; the sales people didn’t seem to mind too much. 🙂
When I’d finished year 12 of high school, had started working as a nurse in 1981, and was earning money, I bought a CASIO FX-702P, essentially a calculator with an interface for a cassette recorder (for programs and data and printer that was programmable in BASIC. 
I program my home computer. Beam myself into the future.
it somehow seemed that the future was coming fast and that it was going to be overwhelmingly positive. This was a time of innocent joy when nothing was standardised (hardware or operating systems), the term micro-computer was more likely to be used than personal computer, the sterile DOS-based IBM PC “business computer” was barely beginning to emerge and the Macintosh was not yet in sight.
The pages of magazines like Australian Personal Computer and Compute! were filled with BASIC program listings for specific machines just crying out to be adapted to other BASIC dialects. Reading books such as Christopher Evans’ The Mighty Micro (1979) filled me with optimism for the future. Reading Isaac Asimov’s I, Robot and the like fired my imagination, as did TV shows like Dr Who and Blake’s 7. To be honest, all of this was also somewhat of a welcome escape from the daily realities of being a young nurse.
My next machine was a Commodore PET (CBM 4016). Built like a Sherman tank, I added a 5.25″ floppy disk drive (that had cooling problems!) and a dot matrix printer via the PET’s IEEE interface. I happily spent many weekends creating games in BASIC on this computer. I also wrote a version of Eliza-the-psychotherapist that kindled an interest in artificial intelligence and language processing. Occasionally entering the PET’s machine language monitor programming got me thinking more about low-level concepts (processor registers etc). Reading a book called Programming the 6502 by Rodnay Zaks (1981) helped further my understanding. 
By far the most important computer purchase ever for me was a Commodore Amiga 500. I learned so much from that machine, initially programming it in AmigaBASIC and smatterings of machine code, then in C and a handful of other languages. The Amiga’s pre-emptive multi-tasking operating system and state of the art graphics and sound capabilities were fantastic. It was also to this machine that I connected my first hard disk drive. I wrote simple astronomy programs, a simple drawing program for Karen, and created an alarm and security system with infra-red sensors, keypad, strobe light etc. It even woke me (or more likely Karen so she could come to my aid) up if I went for a sleep walk. 🙂 I also used the Amiga and C64 for the pre-Internet Viatel (Australia’s Teletex system), bulletin boards, and Compuserve.
I took a statistics course at UniTas (Launceston) for fun in 1987 and a year or so later had started an Applied Computing degree there. I took a double major in computer science and philosophy. This ultimately lead me away from a career in nursing and onto a software engineering career (after stints as a computer systems officer and a junior academic post-graduation). One of the subjects I took as an undergraduate was “Advanced Programming” in which we wrote a compiler for a subset of Pascal into p-codes (similar to UCSD p-codes and not unlike Java VM bytecodes) rather than assembly or machine code for the native machine (Intel). One outcome is that I became increasingly interested in programming language translation and programming paradigms (especially object oriented, functional, logic and concurrent). Another outcome is that I resolved to take that knowledge and write a compiler for the Amiga for a language that I myself would want to use, not just as an academic exercise.
In October 1991, I started development of ACE BASIC for the Commodore Amiga computer. It was released to testers in March 1992 and made available for public consumption in February 1993. Like the original Dartmouth BASIC, ACE was compiled, unlike many implementations that have been interpreters. ACE was a compiler for the interpreted Microsoft AmigaBASIC that shipped with the Amiga.
This article written for the online Amiga Addicts journal gives some idea of the history and motivations for ACE and here is an interview I gave in 1997 about ACE. Although the instruction set of the Amiga’s 68000 processor was not quite as orthogonal as the PDP-11’s, it was still really nice. ACE compiled BASIC source into peephole optimised 68000 assembly code.
This was assembled to machine code by Charlie Gibbs’ A68K assembler and linked against library code with the Software Distillery’s Blink linker (later I also used PhxAsm and PhxLnk). I wrote 75% of ACE’s runtime libraries in 
A wonderful community of enthusiastic users built up around ACE. I wrote an integrated development environment, and a community member wrote one too (Herbert Breuer’s ACE IDE is shown below).
Another member wrote a “super-optimiser” that rewrote parts of ACE’s generated assembly code to be even faster than I managed with my simple optimisations.
ACE was guilty of a criticism by the Dartmouth BASIC co-inventors (John Kemeny and Tom Kurtz) 
Given the Amiga’s demise, around 1996 I moved onto other platforms. I wrote a LISP interpreter for the Newton PDA (also doomed; I can pick ’em!) between 1998 and 2000. That was fun and had a nice small community associated with it, but it didn’t match ACE and its community.
I eventually came to possess PCs, programming them with a smattering of GW-BASIC, quite a lot of Turbo Pascal, some Microsoft Quick C, a little assembly, and Visual BASIC.
When Java appeared in 1996 I greeted it with enthusiasm and have been an advocate of it and the Java Virtual Machine, as a professional and spare-time software developer, on and off ever since. These days I’m more likely to code in Java, C/C++, Python (where once I would have used Perl) or perhaps R rather than a BASIC dialect, none of which denigrates BASIC.
The fact is that BASIC made early microcomputers accessible such that many of us interacted with them in ways more directly than is possible with modern computers (PCs and Macs), despite all their advantages and power. Arguably, we expected less from the machines yet engaged in highly creative relationships with them. Anyone who has spent much time programming will recognise the allure. The interactive nature of these early BASIC machines only added to this.
I agree with the famous Dutch computer scientist Edsger Dijkstra when he says that:
Computing Science is no more about computers than astronomy is about telescopes.
I also sympathise with his declaration that the BASIC statement GOTO could be considered harmful, due to the “spaghetti code” it leads to. But I don’t really agree with his assessment that:
It is practically impossible to teach good programming to students that have had a prior exposure to BASIC: as potential programmers they are mentally mutilated beyond hope of regeneration.
I heard the same propaganda from a University lecturer. Apparently some us of were able to be “rehabilitated”. Then again, along with his comments about BASIC, Dijkstra made some unkind comments about other programming languages, including COBOL, Fortran, and APL, for example:
The use of COBOL cripples the mind; its teaching should, therefore, be regarded as a criminal offense.
With apologies to Grace Murray Hopper, I have more sympathy with this last one. 🙂
The truth is that all programming languages are crude approximations of the Platonic ideal of bringing together two minds: one artificial, one natural. There are no programming languages about which I can say: there are no improvements possible here, and there are very few languages that make communion with the machine a beautiful experience. All are to be reviled and admired for different qualities. But BASIC, in all its dialects, with all its flaws, and with the benefit of 20/20 hindsight and large gobs of nostalgia, was mostly to be admired and was directly responsible for many of us falling in love with the idea and activity of programming.
Viva la BASIC! Happy 50th anniversary!