Re: MAX Machine PLA equations

On Fri, Aug 05, 2016 at 08:30:48PM +0200, Michał Pleban wrote:
> Hello!
> 
> I read the 6703 PLA in an EPROM reader and minimized the equations. On a
> first glance they look good - the appropriate chips are selected in
> correct places on CPU and VIC accesses (note that RW_IN is negated and
> delayed with regard to CPU RW signal):

That gives:

===
T := (BA or RW_IN) and CLK0

if (T) {
	not #RAM   := A15..A11=00000
	not #EXRAM := A15..A11=00001
	not #ROML  := A15..A13=100
	not #ROMH  := A15..A13=111
} else {
	not #RAM   := A13..A11=000
	not #EXRAM := A13..A11=001
	not #ROML  := 0
	not #ROMH  := A13..A12=11
}

not #VIC    := A15..A10=110100 and CLK0
not #SID    := A15..A10=110101 and T
not #COLRAM := (A15..A10=110110 or not T) and CLK0
not #CIA    := A15..A10=110111 and CLK0

RW_OUT := not T
===

The memory part makes perfect sense, but the rest is a bit weird.


Segher

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