[BBC-Micro] Reversing the Tube ULA (destructively)

Phill Harvey-Smith afra at aurigae.demon.co.uk
Tue Oct 26 04:53:23 BST 2010


Rick Murray wrote:
> On 26/10/2010 03:34, Jules Richardson wrote:
> 
>> Also, is it *that* hard to reverse-engineer and produce a pin-compatible
>> equivalent?
> 
> Maybe my brain is in lala land right now (5h20 as I wrote this, having 
> finished work about an hour and a half ago, so yeah, this may be a fault 
> in my hashing tables...) but didn't Mr. Kortink do this?

Sort of,

I believe his clone, doesn't have as many bytes in it's FIFOs, and I 
seem to remember him saying that it didn't do DMA I think, but that it 
was close enough that the differences didn't make that much difference 
to throughput, couuple of percent if memory serves.

Cheers.

Phill.

-- 
Phill Harvey-Smith, Programmer, Hardware hacker, and general eccentric !

"You can twist perceptions, but reality won't budge" -- Rush.



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