[sdiy] Andromeda A6 repair?

[MTG]

Hi Barry,


NV SRAM being what?  A DIP with a battery built in?  Do you have a part 
number for that?

I've seen SRAM of just about every flavour fail at one time or other, 
but if there are mis-matched logic families that might account for a lot 
of really hard-to-put-a-finger-on trouble.

I wonder if the CS with the resistor might be better served with a 
diode?  What year is this thing ... are we talking mostly SMD?

GB


On 1/13/2015 11:00 AM, Barry Klein wrote:
> No SPI, old school parallel busses.
>
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of gordonjcp at gjcp.net
> Sent: Tuesday, January 13, 2015 10:51 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Andromeda A6 repair?
>
> On Tue, Jan 13, 2015 at 06:40:40PM +0000, Barry Klein wrote:
>> I am a bit confused though about the memory management.
>> There is a Flash, NV SRAM, and two "high speed" SRAM chips.
>> Would an issue with the NV SRAM chip be responsible for a hang on the write to flash?
>
> Yes, if they share a common SPI bus (or parts of it).
>