IIGS stability problem after RAM upgrade!

["Deacon Blue" <scavenger@apexmail.com>]

Hello!

I have encountered stability problem after upgrading the RAM on my IIGS v.
ROM 01.

GS/OS  System 6.0.1 is booted from a preinstalled 340MB Focus Drive
delivered from Altech Inc placed in slot#2,

-> The RAM card is of brand 'AE RAMCARD Plus'  with three rows � 16 RAM
chips ( 48 chips total).

However, there seems to be some stability problems. After entering the GS/OS
the system crashes within in a few minutes with following diagnosis:

> The mouse-arrow freezes up, forcing cold-reboot as the only options.

> On other occasions the following error msg. is issued:   "Detected
trashed memory - software bug, or (less likely) RAM error $0308"

Earlier input from the newsgroup indicates that there may be a DMA-conflict
on the FOCUS drive, and that there may be a switch on the Focos drive, to
shut it off:

--> I've searched my Focus drive, but cannot find any switches at all on the
card itself! The card is marked  Computer Circulation Systems"  and
][ infitum"  A Toshiba brand HD is mounted on the card.  No switches can be
seen!

Other information:

-->I do not as yet run an accelerator card on the unit!

-->  I tried to downsize the card by removing 1 and 2 rows of chips, but
this did not seem to have any effect on the unstability.

The machine boots but goes into a freeze after 1-2 minutes of operation,
sometimes signalled by a beep.

Any advice appreciated!