Editing Timex Sinclair 1000 (section)

===Bugs===
There are two little-known software differences between the T/S 1000 and T/S 1500.<ref>{{Cite web |title=Ask HN: What bug(s) make "LPRINT 0.00001" output "0.0XYZ1"? {{!}} Hacker News |url=https://news.ycombinator.com/item?id=21363892 |access-date=2023-01-20 |website=news.ycombinator.com}}</ref>

On the T/S 1000 and ZX81, the command:

 LPRINT 0.00001

results in the Timex printer outputting <code>0.0XYZ1</code>. This well-known fault was corrected on the T/S 1500.

The T/S 1000 runs the following loop correctly, but the T/S 1500 does not; it makes one fewer iteration than it should.
<syntaxhighlight lang="basic">
10 FOR I=0 TO 1 STEP 0.25
20 PRINT I
30 NEXT I
</syntaxhighlight>