On 2002.07.16 00:50 Hugh Graham wrote:

> I did a little reading about FEPROM though, and I get the impression
> that some may allow bits to be cleared at any time, but set to 1 only
> in complete blocks.
Yes. Flash PROMS can be cleared only page by page. The pagesize depends
on the device, it is often 64 kB or 128 kB. Special reads / writes to
special parts of the Flash are required to get this happen. The exact
sequence depends on the device.

> If someone who actually owns one of these machines
> wants to check if the proms are socketed, 
They are four PLCC parts, soldered to the main PCB. 

> On the other hard, DEC apparently did have software to do this in the
> field, and locating their software would be the most robust solution.
Yes. I also had the idea to use JTAG. But this requires even more in
depth knowledge of the machine. 

> I'm still interested in receiving more prom images, 
I have two VS4k90. One with broken firmware, one without. I will dump
them later this week... 
-- 



tschüß,
         Jochen

Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/