Hi all,
After washing and recapping my SE/30´s mobo, it now starts with a loud, clear "bong" -- no more SimasiMac! Here it is, connected via LocalTalk to my Quadra 700 (as AppleShare server):
It is productive, as you can see
More pics (and video!) of the restoration at the flickr set.
...but still won´t boot from the (known good) SCSI disk -- either external or internal, although it boots fine from a floppy. I´m thinking of a bad 53C80, which I could fix -- have the spare and, hopefully with the help of the Electronics Department of my School, the ability to replace it ;-)
Anyway, I observed the following:
-Upon startup, it doesn´t lock at the checkboad pattern -- after a few seconds, the floopy icon with blinkng ´?´ appears as expected.
-Every time it does a SCSI bus scan, the activity LED of any connected device (external or internal) does make a brief flash, seems like "being polled"
-If "improper" termination is used, the scan takes much longer (6-7 sec)
-Tried any termination/connection scheme, even swapping cables.
-Checked with a DMM the resistance of the lines in RP3 and RP10 -- without desoldering them. All lines measure 50 ohm, as expected.
-HD SC Setup sees nothing in the bus.
However, here comes the weird part: SCSI Probe 4.3 does see "something" in the bus... it says ´no data´ on the line for each device present -- with correct SCSI IDs.
Does anyone here think of any further testing before declaring the 53C80 as the culprit?
Thanks a lot in advance,
Posting this from my Quadra 700 (68 MiB) + 7.6.1 + Netscape 4.0.4 ;-)
After washing and recapping my SE/30´s mobo, it now starts with a loud, clear "bong" -- no more SimasiMac! Here it is, connected via LocalTalk to my Quadra 700 (as AppleShare server):
It is productive, as you can see
More pics (and video!) of the restoration at the flickr set....but still won´t boot from the (known good) SCSI disk -- either external or internal, although it boots fine from a floppy. I´m thinking of a bad 53C80, which I could fix -- have the spare and, hopefully with the help of the Electronics Department of my School, the ability to replace it ;-)
Anyway, I observed the following:
-Upon startup, it doesn´t lock at the checkboad pattern -- after a few seconds, the floopy icon with blinkng ´?´ appears as expected.
-Every time it does a SCSI bus scan, the activity LED of any connected device (external or internal) does make a brief flash, seems like "being polled"
-If "improper" termination is used, the scan takes much longer (6-7 sec)
-Tried any termination/connection scheme, even swapping cables.
-Checked with a DMM the resistance of the lines in RP3 and RP10 -- without desoldering them. All lines measure 50 ohm, as expected.
-HD SC Setup sees nothing in the bus.
However, here comes the weird part: SCSI Probe 4.3 does see "something" in the bus... it says ´no data´ on the line for each device present -- with correct SCSI IDs.
Does anyone here think of any further testing before declaring the 53C80 as the culprit?
Thanks a lot in advance,
Posting this from my Quadra 700 (68 MiB) + 7.6.1 + Netscape 4.0.4 ;-)