Hi all,

H3NRY thanks for your advice - today I desoldered a 64K chip and put in place a 256K chip from the spare 512K board I have here, using solder sucker and lots of cursing

Fired it up: usual beep, then Sad Mac error code now reads 040080

... indicating a faulty RAM chip at F12.

... little to lose, back I go!

JB