Date   : Sun, 28 Dec 2008 22:19:17 +0000
From   : afra@... (Phill Harvey-Smith)
Subject: OT: ZX80 ROM ?

Mark Haysman wrote:

> However, I've sent you the right one, as I've just checked the schematic. 
> The only time it matters, is if the original device was a TMS-2732, which is 
> tri-voltage, the TMS-2532 is a single voltage device, identical to the 
> (non-TMS) 2732. TI and Intel really messed with peoples heads with their 
> numbering at that time!

Humm acording to the Data sheets I have here for the TI2532 and 
Fairchild 2732, some of the pins *DO* differ namely :-

pin    2532    2732    
18     A11     CS
20     PD/PGM  G/VPP
21     VPP     A11

So there *IS* a difference.

Most significantly if you dump Dragon 32 cartriges which mostly used 
2532, cirtainly the early ones, as if they where 2732s you get a bad dump :(

Cheers.

Phill.


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

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