knop@duteca (P. Knoppers) (06/26/89)
I want to increase the memory of my 1040STf to 2.5M. I have saved some articles about this subject, but all involve adding daughter boards or piggy-backing of chips. This increases the chipcount and the demands on the power supply. Soldering on a daughter board makes repair very hard. I would prefer to de- solder one bank of RAM chips and replace them by sockets that will contain 1M bit chips. I know that there are several types of motherboard in use in the 1040 STf. Mine has the board with the RAM chips underneath the power supply. There are in total 32 RAM chips (256k bit each). My problem is, that I do not know which 16 RAM chips I should replace. I have also found a solder blob that is marked 256k and 1M (or something similar). I suppose that I have to change this too. -- _____ __ __ __ __ ____ _____ _____ ______ _____ _____ | _ \ | |/ || \| | / \ | _ \ | _ \ | ___|| _ \ / ___| | __/ _ | < | || || || __/ | __/ | >__ | < \__ \ |__| |_| |__|\__||__|\__| \____/ |__| |__| |______||__|\__||_____/ P. Knoppers, Delft Univ. of Technology, The Netherlands, knop@duteca.tudelft.nl