🚀 go-pugleaf

I have a strange problem with an old Sinclair ZX-81 that I
think is a bad ROM.  Has anyone else ever experienced
anything like it?  It there a solution?  Note the following
program segment.  It is the top of the program; there is
nothing but REMarks preceding it.

200 LET NRAW = 30
210 LET NWORDS = 300
220 DIM G$(NWORDS, NRAW)
230 DIM R(NRAW)
235 LET T$ = " (I, C, -) "
240 CLS
250 PRINT "string constant"
260 "       "       "
270 "       "
275 "       "
280 "       "
282 "       "
285 PRINT
287 PRINT "string constant"
290 IF INKEY$ = "" THEN GOTO 290
310 FOR A = 1 TO NRAW
320 CLS
330 SCROLL
340 PRINT "BEGINNING GROUP"; A;
...

When I run this I get the error message telling me that A
has not been initialized at line 340.  (I think the message
is 2/340.)  The really wierd part is that the program runs
OK if I remove line 220 (DIM G$(300, 30))!

Any help would be greatly appreciated.  I am on the verge
of pitching the whole darn machine and writing the program
on something else cheap (maybe a CoCo).

	-- Art Z.
	(213)428-1193 evenings
	...!{ucbvax, decvax}!trw-unix!felix!zemon