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The machine below boots the BASICDOS-360K-S80 diskette, with the BASICDOS-360K-TESTS diskette in drive B:, whose TESTS directory contains BENCH.BAS, the benchmarks discussed on this page. Type B:\TESTS\BENCH to run the benchmarks with BASIC-DOS, or B:, CD \TESTS, and then \TOOLS\MSBASIC BENCH to run them with GW-BASIC, which is on that diskette, too (type SYSTEM to return to BASIC-DOS afterward). The full set of tests takes a few minutes, and each result is displayed as it completes.
{% include machine.html id="ibm5150" name="IBM PC, 256Kb RAM, Dual Floppy Drives, CGA" %}
How does BASIC-DOS compare with the BASIC interpreters that IBM PC users actually had? To find out, we wrote a set of benchmarks, [BENCH.BAS]({{ site.github.repository_url }}/blob/master/software/src/tests/misc/BENCH.BAS), that runs unchanged in all three environments:
- BASICA: IBM Advanced BASIC A2.00 from PC DOS 2.00, running with the IBM PC's ROM BASIC
- GW-BASIC: MSBASIC.EXE, built from Microsoft's open-source GW-BASIC files, also running on PC DOS 2.00
- BASIC-DOS: BASIC-DOS's own COMMAND.COM, which compiles each BASIC program into 8086 code before running it
Each test was run on a 4.77Mhz IBM PC XT with a Color Graphics Adapter, both without and with an 8087 math coprocessor, and timed by BENCH.BAS itself, using the BIOS timer tick count. The BASIC-DOS results are from a release (non-DEBUG) build. Times are in seconds (smaller is better), and the fastest time for each test is in bold.
| Test | BASICA | BASICA w/8087 |
GW-BASIC | GW-BASIC w/8087 |
BASIC-DOS | BASIC-DOS w/8087 |
|---|---|---|---|---|---|---|
| Integer math | 30.1 | 30.1 | 27.3 | 27.3 | 5.0 | 5.0 |
| Floating-point math (64-bit) | 42.0 | 42.0 | 14.0 | 14.0 | 10.6 | 1.7 |
| Math functions | 11.8 | 11.8 | 9.7 | 9.7 | 16.0 | 0.5 |
| String functions | 7.4 | 7.4 | 6.5 | 6.5 | 2.9 | 2.7 |
| Arrays and subroutines | 3.5 | 3.5 | 3.1 | 3.1 | 1.2 | 0.7 |
| Primes | 78.9 | 78.9 | 73.6 | 73.6 | 6.9 | 6.9 |
| Screen output | 7.6 | 7.6 | 8.5 | 8.5 | 3.6 | 3.6 |
| Graphics: PSET | 19.9 | 19.9 | 17.5 | 17.5 | 3.7 | 3.7 |
| Graphics: LINE | 4.2 | 4.2 | 5.7 | 5.7 | 1.1 | 1.1 |
| CIRCLE.BAS | 9.1 | 9.1 | 8.4 | 8.4 | 5.6 | 5.3 |
- Integer math: 5,000 iterations of integer multiplication, division, MOD, and AND
- Floating-point math: 2,000 iterations of double-precision multiplication, division, addition, and subtraction
- Math functions: 200 iterations of SQR, SIN, COS, ATN, LOG, and EXP
- String functions: 500 iterations of STR$, LEFT$, MID$, RIGHT$, LEN, ASC, INSTR, and string concatenation
- Arrays and subroutines: filling a 500-element array, and then summing it with 500 GOSUBs
- Primes: counting the primes below 3000 by trial division
- Screen output: printing 100 lines of text
- Graphics: PSET: plotting 5,440 points in 320x200 graphics mode
- Graphics: LINE: drawing 130 lines
- CIRCLE.BAS: one pass of the drawing loop from CIRCLE.BAS, the PC DOS 1.00 sample program: 48 arcs, followed by a PAINT of the center, using the original (single-precision) code
For programs that do most of their work with integers, which includes most games, utilities, and of course PRIMES, BASIC-DOS is typically 5 to 11 times faster than BASICA and GW-BASIC.
BASICA and GW-BASIC are also unable to use an 8087, because internally, they use a floating-point format known as MBF (Microsoft Binary Format). BASIC-DOS performs all floating-point operations using IEEE 64-bit precision, automatically using an 8087 when one is installed and software emulation otherwise.
That's the end of the current preview. All the demos featured in the preview are also available in our set of Demo Configurations.