[Coco] M.E.S.S. 6309 error

[Roger Taylor]

The LDBT and STBT instructions in the COCO3H mode of M.E.S.S. are broken.

The following program should take the value poked at <255, read the 7th 
bit, store that bit into the 7th bit of register A, then store register A 
to the screen at 1024.

LOADM this program, POKE a 255 into address 255, type EXEC and then do a 
PEEK(1024) to see the results.  Bit 7 of [1024] should be a 1 since the 
value at 255 is all 1's.  I've tried many other combos and nothing seems to 
work or give a clue to what M.E.S.S. is doing.

	org	3584
start	clra
	clrb
	ldbt	a,7,7,<255
	stb	1024
	rts
	end	start


-- 
Roger Taylor