68kMLA Classic Interface

This is a version of the 68kMLA forums for viewing on your favorite old mac. Visitors on modern platforms may prefer the main site.

Click here to select a new forum.
TAM
Posted by: falen5 on 2015-05-18 14:45:25 gave it a good wash - vinegar/water 50/50, then the usual water and washing up liquid it looks allot better - there is still some green , but allot of the via's that were all green now show some shiny solder - will have to leave it till tomorrow - - heres hoping!
Posted by: 360alaska on 2015-05-18 14:47:18 Focus on that rom slot and it might work, you might not even need that rom since the 6500 doesn't but I'm not sure...
Posted by: falen5 on 2015-05-18 16:25:23 Don't understand why it would work without the rom!!! Does it have another onboard? - off to bed for me - sure I had to film the teardown - good luck people -
Posted by: Byrd on 2015-05-18 16:31:43 I know where you can get TAM boards. They aren't cheap but they are available. Hey hap, is that from that place in the Netherlands? I've been keenly looking for a CS slot riser card for years, but even he doesn't have them. If you ever come across one, please let me know. Nice score falen5 - I wouldn't go too overboard with the cleaning (and let it dry for a few days in a sunny location, not just one), or worry about caps. Hoping you will get more life out of it. You should also check the sub/PSU cord for any damage, and do a multimeter check to check power is actually getting through 🙂 The 6500 board could be modified to fit, once you desolder some connectors and I'm betting the TAM's sound PCB is a straight drop in once soldered. Then all you are missing is the startup chime, but since the 6500 and TAM ROM are exactly the same, I'm betting it's a resistor placement on the board that sets the unique TAM startup chime.
Posted by: Paralel on 2015-05-18 16:39:15 Also, just as a minor point on the chemistry, if vinegar neutralizes it, then its an alkaline substances eating the board, not an acid, you can't neutralize an acid with an acid (at least not in the purest sense of the phrasing)
Posted by: 360alaska on 2015-05-18 16:58:05 Don't understand why it would work without the rom!!! Does it have another onboard? - off to bed for me - sure I had to film the teardown - good luck people - yes, it does have two on board roms: These two guys are what the 6500 uses to boot so I'm thinking it might work without that rom simm...
Posted by: haplain on 2015-05-18 16:59:54 It WILL work without that ROM SIMM for sure.
Posted by: 360alaska on 2015-05-18 17:02:15 It WILL work without that ROM SIMM for sure. I wonder if it will have a different gestalt without that rom sim though, maybe it will identify itself as a 6500?
Posted by: unity on 2015-05-18 21:43:20 There is no ROM SIMM for the TAM, never was unless proto. Good theory on the ROM with startup chime. I can not say, but falen5 I think has the skills to swap ROM chips if needed.
Posted by: 360alaska on 2015-05-19 09:15:16 There is no ROM SIMM for the TAM, never was unless proto. Good theory on the ROM with startup chime. I can not say, but falen5 I think has the skills to swap ROM chips if needed. His has a rom simm, yours doesn't?
Posted by: Macdrone on 2015-05-19 09:19:35 It's not a rom simm , it should be cache card, which with a G3 upgrade should be removed. Maybe that's why it was put away and didn't work in the first place. Rom simm and cache cards use the same slot on those boards. In fact my 6500 says rom/cache slot.
Posted by: unity on 2015-05-19 09:31:47 His has a rom simm, yours doesn't? Thats not a ROM and no mine does not. Like all production TAMs the ROMs are soldered in.
Posted by: falen5 on 2015-05-19 10:08:16 how we doing people - finally got home to have a go at starting this thing up - as for the rom's etc etc ....heres a few snaps of the board. - Ive never had a tam before so I make no claims. But the board says rom , cache, and drams - I don't know! - anyway will try to put it together and see what happens. If it powers up ill try it with and without the rom.....just to see if there is a difference. - all I can think is that there must be some reason apple put a separate rom in this - oh...the guy I bought it from in Dublin told me that he bought it while over in the states, and was so impressed with the sound he shipped it back home to Ireland. So its a TAM from America and not a European version. Best find in ages...I bought the TAM and the classic 2 from him for 200 euro - weh hey!
Posted by: unity on 2015-05-19 10:24:25 The part number shows its a G3 ROM? I wonder if someone thought it was or is needed for the upgrade card? I never heard of that if so. And like I said, the TAM never shipped with its own ROM card.
Posted by: haplain on 2015-05-19 10:25:57 Check to make sure the Bose unit has the appropriate power voltage selected. Sounds like it probably does but always good to check. Keep us posted and my fingers are crossed for you.
Posted by: falen5 on 2015-05-19 10:40:18 first thing I checked haplain..............don't want any explosions - still some 'green' on the main board - my eyes are going bad...quickly...I only see the green in the pictures. - will give the board a wash in acetone, dry it out, and plug it in - fingers crossed
Posted by: 360alaska on 2015-05-19 11:08:50 The part number shows its a G3 ROM? I wonder if someone thought it was or is needed for the upgrade card? I never heard of that if so. And like I said, the TAM never shipped with its own ROM card. And the plot thickens... The funny thing is that the 6500 board has the pads for the rom but not the socket?
Posted by: unity on 2015-05-19 11:28:33 Ya, the 5500 & 6500 are the same board as the TAM, just with modifications. My guess for the TAM having the ROM slot installed is given the unique nature of the machine. Its pretty common for Macs, even the PowerPCs, to have a ROM slot but no ROM intended for it. Being what the TAM was, it may have been a safety net thing.
Posted by: 360alaska on 2015-05-19 11:31:59 Yeah, I mean... I would say keep it in since it came with it 🙂
Posted by: haplain on 2015-05-19 11:34:35 Nearly all of my TAM's which is a gaggle at this point, came with the chip but I don't have them in. They work without any issues. Given the corrosion, I wouldn't install it as it could cause more issues than doing anything positive.
< 2 >