gt4417a@prism.gatech.edu (04/29/91)
Could someone share with me the magic of how to get a sun 4/110 to accept some 1-meg simms? I don't have the technical manual and the system isn't covered by our support contract anymore. There are 32(!) simm slots on the cpu board and each of them originally had a 256k simm installed. I installed 16 1m simms in place of 16 of the 256k simms. The whole deal ended up like this: __HHHHHHHH___HHHHHHHH___HHHHHHHH__ | | | ________ ________ | * I put the memory in 2 and 4. Any | | | | | | other arrangement of the memory | | 3 | | 4 | | wouldn't boot. | | 8x256k | | 8x1 meg| | | -------- -------- | * the jumpers j1300 and j1400 looked | ________ ________ | like this originally: | | | | | J1300 | | | 1 | | 2 | | same XX XX = jumper | | 8x256k | | 8x1 meg| J1400 | diff -- | -------- -------- | 256k XX | | 1M -- | | 2PM -- | | <32M XX | | 32M -- | | ____________________________________ * I moved the 256k jumper on the / \ j1300 block to 1M after I put the A memory in. After all of this I changed the Installed Memory (0x14) and the Memeory to Check (0x15) to 0x12 (18) meg. I also changed 0xbd (in the cpu configuration block) to 0x12. After all of this when I booted it says that I only have 8meg installed and it only checks 8meg and the message after it loads vmunix says 8meg. Any suggestions? Joel Skelton Georgia Institute of Technology, Atlanta Georgia, 30332 uucp: ...!{allegra,amd,hplabs,ut-ngp}!gatech!prism!gt4417a Internet: gt4417a@prism.gatech.edu