wintr Posted August 31, 2020 Report Share Posted August 31, 2020 Morning all, I've tried a few searches on this site and on Google directly, but I can't seem to find a reference for Sad Mac error codes for the Macintosh Classic. For the SE and Plus yes, but not the classic directly. Or, perhaps I have misinterpreted what I was reading and maybe just need to have someone nudge me in the right direction? I have one Classic that will boot fine without the RAM expansion installed. With the RAM expansion installed I get a Sad Mac with the following code: 00000005 00100000 Following this document here: https://udcf.gla.ac.uk/~gwm1h/Error_Codes/Sad_Mac_Codes.html It says: "$05 - RAM external addressing test failed. Minor error code indicates a failed address line." which follows that this only happens when the RAM expansion is in. The lower numbers should be the address line that I should be checking. But how do I translate 00100000 into a trace on the motherboard that I should be checking for continuity? Any advice would be welcome. Thanks in advance. Quote Link to post Share on other sites
plb007 Posted October 18, 2020 Report Share Posted October 18, 2020 Hi, I've got a similar problem, but without the second line (00000000) Did you fix your problem, and (if yes) how ? My recapped classic boots fine without the ram expansion in, but boot with this memory error when inside. Regards, Quote Link to post Share on other sites
SkyBry Posted December 1, 2020 Report Share Posted December 1, 2020 (edited) I have the same error at boot; no sound for me, but sad Mac error shows immediately with 00000005 and address of 00080000. If I pull the memory board out, I can get past this error and boot from the built-in system rom, but System 7 on the hard drive doesn't have enough memory to boot. I've examined the motherboard for any damage and so far cannot find anything... it looks pristine. I cleaned it anyway in case of capacitor leakage, but no difference in behavior. So far I can't find a clue to the cause, but I'll post a follow-up here if I figure it out. Edited December 1, 2020 by SkyBry Spelling error. Quote Link to post Share on other sites
68kMLA Supporter superjer2000 Posted December 1, 2020 68kMLA Supporter Report Share Posted December 1, 2020 I would start buzzing out all the memory lines per the schematic. If there is good continuity, there are a few chips related to memory that are generic and are cheap enough it’s worthwhile to just replace them. Of course that’s assuming the memory cards are good. I fixed my Classic that was only showing 512k ram that way (search here for Classic 512k ram or something similar) Quote Link to post Share on other sites
dochilli Posted December 1, 2020 Report Share Posted December 1, 2020 (edited) Just an idea: 00000001 A0? ; 00000002 A1?; 00000004 A2? 00000008 A3? 00000010 A4? ; and so on? 00100000 would be A20? 00080000 would be A19? Do not know, if I am right, but could be possible. Edited December 1, 2020 by dochilli Quote Link to post Share on other sites
68kMLA Supporter Stephen Posted December 3, 2020 68kMLA Supporter Report Share Posted December 3, 2020 On 11/30/2020 at 9:45 PM, superjer2000 said: I would start buzzing out all the memory lines per the schematic. If there is good continuity, there are a few chips related to memory that are generic and are cheap enough it’s worthwhile to just replace them. Of course that’s assuming the memory cards are good. I fixed my Classic that was only showing 512k ram that way (search here for Classic 512k ram or something similar) Just emphasizing this — I don't have a lot of experience with replacing ram chips, but if I learned anything from watching Adrian's Digital Basement, it's that ram chips fail very often (even new chips!) Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.