Readin keyboard and IRQs

[ross]

Originally Posted by hooverphonique

That could be the case, of course

Originally Posted by NorthWay

I have one that came with a B2000 rev 4.2(or was it 4.1?), but I'm pretty sure it works fine with 85ms. IIRC I used E-Clock syncing to busy-wait.
It does definitely not work with a whole lot of stuff that assumes instant reaction like A500 keyboards.

Is your keyboard now on a base machine with a 68k 7MHz processor?
It might be interesting to try this stupid code, which practically zeroes the times of the 'extra' operations (whether they are loops, CIA timer checks or IRQ).

us	equ	85

	lea	$dff000,a5
	lea	$bfee01,a4
	move.w	#$4000,$9a(a5)
	move.w	#$0200,$96(a5)
	move.w	#$0200,$100(a5)
	moveq	#$40,d0
	moveq	#~$40,d1

.lo	btst	#6,-$e00(a4)
	bne.b	.tk
.ex	move.w	#$8200,$96(a5)
	move.w	#$c000,$9a(a5)
	moveq	#0,d0
	rts
.tk	btst	#3,-$100(a4)
	beq.b	.lo

	or.b	d0,(a4)
	REPT	us/5-1
	move.l	0.l,0.l		;36c ~5us
	ENDR
	and.b	d1,(a4)         ;36c
	move.w	6(a5),$180(a5)
	bra	.lo

EDIT:
[pedantic mode on]
The line

REPT us/5

really need to be

REPT us/5-1

because

and.b d1,(a4)

requires two accesses to the very slow CIAs, driven by E-clock @(CCK/5 D=.4).
This add another 36c to the count.
[pedantic mode off]

[NorthWay]

All my machines are more or less incommunicado at the moment, and to write out a floppy with that on requires them to be up and running. The kb is hooked up to my A1000 which would ofc be a perfect place to test it.

I had a 28MHz 040 in the B2000 at one time, and IIRC I just threw a bunch of REPT/ENDR to do a number of CIA accesses. I think I used it in my Bubble Bobble patch.

[ross]

Originally Posted by NorthWay

All my machines are more or less incommunicado at the moment, and to write out a floppy with that on requires them to be up and running. The kb is hooked up to my A1000 which would ofc be a perfect place to test it.

I had a 28MHz 040 in the B2000 at one time, and IIRC I just threw a bunch of REPT/ENDR to do a number of CIA accesses. I think I used it in my Bubble Bobble patch.

It would be interesting to look at your patch, to understand how many cycles are actually used.

When it happen to use your A1000 and be able to use that code, let us know