Ed, all

Just tried with the BASIC3.rom replaced from the basfix02.zip file in your link.

Again, configuring as a 8KByte RAM machine the program fails and shows just 11 '.'s - so that looks like the same number of outer loop iterations that Micro_brain was seeing in hardware. The emulator returns ...

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Would anyone with an 8k BASIC installation care to try this out?



7 DIM CL$(71,24)
8 FOR Y=0 TO 23:FOR X=0 TO 70
9 CL$(X,Y)=CHR$(27)+"["+MID$(STR$(Y),2)+";"+MID$(STR$(X),2)+"H"
10 PRINT ".";:NEXT X:PRINT:NEXT Y



It should print 24 rows of dots on the screen, each 71 chars long.

Some ...

Hi Chuck, all

It is an interesting project. Is the hardware timer something that others can buy off the shelf?

Which timer were you thinking of?

The BBC has a custom ULA on the motherboard which takes in the 16MHz master clock and derives 8, 4, 2 and 1MHz clocks mainly for video use. The 2 MHz ...