# INMC 80 News

## February-April 1981, Issue 3

-43-

Would you care to help or advise me or even try the modification and make it work? I’m sure other members of the INMC would be interested.

Yours sincerely S. C. Willmott

Whilst on the subject of video problems, about the same time as the above was recieved, we had a little note from D. R. Humphries of Maypole Heath, Canterbury. Many N2 owners will be aware of the “nasty” shape of the LD signal to IC65 which manifests itself by making the video display the front half of each character twice. The recommended cure is to zap a 100pF C from pin 1 of IC65 to ground. Not very elegant!! Mr. Humphries suggests changing IC71 from a 74LS20 to a 74LS13. This works well, and is nice and tidy. The same trick works with the shifted video blanking problem that can occur when 1055 is a bit slow. This time IC55, the 74LS20 may be replaced with a 74LS13.

Yet another PRINT USING routine by J. C. Curtis

The routine involves deciding the largest number of significant figures to the left of the decimal point and assigning this to variable SF. Then decide how many places to the right and assign this to DP (SF > DP please). The variable is assigned to Z and is returned in Z\$.

1000 ZS=STRS (INT (ABS (Z)*10’DP)

1010 Z\$=RIGHTS (2\$,LEN(Z\$)-1)

1020 IF LEN(Z\$)=SF THEN 1050

1030 FOR I=0 TO SF-1-LEN(Z\$)

1040 Z\$="0": NEXT

1050 IF DP=0 THEN 1070

1060 ZS=LEFTS (Z\$,SF-DP)+"."+RIGHTS\$(Z\$,DP) 1070 IF Z<0 THEN 1090

1080 z\$="_ "4+2\$:RETURN

1090 Z\$="—"4+2Z\$:RETURN

Moot point by Dave Hunt

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