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Apple Computing Products:
macOS - Desktop Hardware
Macintosh SE Miniscribe hard disk
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<blockquote data-quote="Papalapa" data-source="post: 1806493" data-attributes="member: 400766"><p>Well, after some work totally dissasembling, cleaning, memory upgrading and purchasing a keyboard and mouse, the first start up once assembled was a nightmare because the Mac don't turned on. There's no "chime" noise nor HD or flopppy activity so, I suspect that there's a problem in the mainboard.</p><p></p><p><img src="https://i.imgur.com/UCh5XEK.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>I found that this error code means<em> "$0E - Data bus test at location $0 failed. Minor error code indicates the bad bits as a 16bit mask for bits 1500. This may indicate either a bad RAM chip or data bus failure."</em>. When I purchased the Mac it was correctly working except the HD and the only internal change has been to replace two 256Kb. memory modules by two 1MB memory modules for a total of 4MB. The purchased modules were tested with an electronic SIMMs tester and were corrects. Both new SIMMs are 80ns (as the 2 orignal SIMMs) and with parity while the original ones are without parity but if I well understood these type of moudles can be mixed in the Macintosh SE because both are accpeted. <strong>Maybe I'm wrong? ¿?</strong> Of course the same type modules are correctly placed in a row.</p><p></p><p>The other cause can be the memory socket but I do not think so. As the socket was plastic made I broke two small tabs when the modules were released for cleaning purposes, but even so I think that the contact is good and there's not a bad contact. This week-end I'll try to set only a pair of modules and disconnect the hard disk leaving only the floppy to see what happens. Later, I'll test the other pair of SIMMs and if all is OK, set the 4 SIMMs together again.</p><p></p><p>Meanwhile as it seems that I stll have a lot of things to learn, I'll continue with my favorite book <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p><p></p><p><img src="https://i.imgur.com/BcHcb4t.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Bye!</p></blockquote><p></p>
[QUOTE="Papalapa, post: 1806493, member: 400766"] Well, after some work totally dissasembling, cleaning, memory upgrading and purchasing a keyboard and mouse, the first start up once assembled was a nightmare because the Mac don't turned on. There's no "chime" noise nor HD or flopppy activity so, I suspect that there's a problem in the mainboard. [img]https://i.imgur.com/UCh5XEK.jpg[/img] I found that this error code means[I] "$0E - Data bus test at location $0 failed. Minor error code indicates the bad bits as a 16bit mask for bits 1500. This may indicate either a bad RAM chip or data bus failure."[/I]. When I purchased the Mac it was correctly working except the HD and the only internal change has been to replace two 256Kb. memory modules by two 1MB memory modules for a total of 4MB. The purchased modules were tested with an electronic SIMMs tester and were corrects. Both new SIMMs are 80ns (as the 2 orignal SIMMs) and with parity while the original ones are without parity but if I well understood these type of moudles can be mixed in the Macintosh SE because both are accpeted. [B]Maybe I'm wrong? ¿?[/B] Of course the same type modules are correctly placed in a row. The other cause can be the memory socket but I do not think so. As the socket was plastic made I broke two small tabs when the modules were released for cleaning purposes, but even so I think that the contact is good and there's not a bad contact. This week-end I'll try to set only a pair of modules and disconnect the hard disk leaving only the floppy to see what happens. Later, I'll test the other pair of SIMMs and if all is OK, set the 4 SIMMs together again. Meanwhile as it seems that I stll have a lot of things to learn, I'll continue with my favorite book ;) [img]https://i.imgur.com/BcHcb4t.jpg[/img] Bye! [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
Macintosh SE Miniscribe hard disk
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