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  1. Hello Everyone, Sorry for my absence from this site. I have been busy with work and have not had a chance to work on my TAM for a very long time. In fact I have decided to put it up for sale in the hopes that it will go to a good home. If you are interested you can find the auction of eBay by searching "Apple Twentieth Anniversary Macintosh TAM in excellent condition + many extras" (hopefully me announcing this here is not breaking the rules of this site). Cheers, Igor
  2. Hi Foxx, Unfortunately I was never able to solve the problem. I tried everything imaginable: reset PRAM, reset CUDA, replaced the RAM with the original one, installed original HDD, tried Mac OS 8.6, 9.1, 9.2.2, installed (and removed) various versions of the Sonnet drivers, let the computer sit unplugged and with PRAM battery disconnected for hours... everything I could do to get it working I tried to no avail. After all this I think the problem lies with my Sonnet card. The past few months I’ve been looking for another Sonnet card to try out, but have been unable find one. I hope you have better luck than me and find a way to get your card to work. What model/specs is your card? Keep us updated, I’m curious to know if you get yours to work. Cheers, igor
  3. Yes the PRAM battery was recently replaced with a fresh new one. The one I replaced it with is this one: https://www.amazon.com/dp/B000PCCBMS/ref=cm_sw_r_cp_apip_USbAoZYtfN3AK So the battery shouldn’t be the problem. At least I would hope.
  4. Thank you for the link. I tried downloading versions before 2.0, however the TAM does not recognize the file. I download through my PC, and therefore lose the creator of the file. Is there another location where I can download the files in .sit format? I tried to install the Sonnet under OS 8.6 (I have this on another SD card - it’s so easy to swap them out) and have the same problem as described above. You mention that the Sonnet card modifies the PRAM, I think this is where the issue lies because it’s as if the computer does not have a cpu installed when the Sonnet card is inserted. When installed I think it might create a conflict with the 603e processor since the instructions are not redirected to it and the TAM just hangs. Is it possible that somehow the Sonnet software is not able to write to PRAM? If so what can I do to correct this? (I did zap the PRAM with the 1MB L2 cache card installed before installing the Sonnet software). I tried installing Sonnet software version 3.1 (the only other version I was able to download and install), but I get the same results as v2.3.1. Thank you all again for your help.
  5. Hello and thanks for your suggestion. Unfortunately I’m not able to find any information regarding a TAM firmware update/upgrade online.
  6. That’s a good suggestion about having the card tested by another member. I am located in Burlingame, California, zip code 94010. Just south of San Francisco. If anyone is near me and willing to meet let me know, otherwise I can send the card by mail to have tested. The TAM works flawlessly without the Sonnet card installed, and with the 1MB L2 50Mhz cache I have installed in it, its actually rather snappy. I was just hoping for an additional speed bump with the Sonnet card. Cheers. Igor
  7. I tried doing it but it will not chime three times. I believe it chimes once (like during normal boot) and I just get the black screen and nothing happens.
  8. Hi JB, Thank you for your suggestions. I tried exactly as you said - cleaned the contacts of the Sonnet card (they were pretty dirty actually), unplugged the TAM, disconnected PRAM battery, pressed the CUDA switch for 10 seconds, removed one of the two RAM sticks, and left it unplugged for more than 30 minutes. I was really hoping this would work, but, alas, no change: I get the chime, the led light next to the headphone jack turns green, but no "Happy Mac" icon and the screen remains off. I replaced the Sonnet card with the 1MB L2 cache card and it booted right up as usual. I really think I have a bad Sonnet card... Igor
  9. Hello Everyone, This is my first post here, however I have used this excellent forum to gather information on vintage Macs and Newtons for quite some time now A few months ago I acquired an Apple Twentieth Anniversary Mac (TAM) and have been having fun fiddling with it and upgrading it. I love the sound this thing produces and my intention is to use it as my DAW (Digital Audio Workstation) with Opcode Vision and Galaxy connected to my Kurzweil K2600xs and Teenage Engineering OP-1. Since I received the computer I have installed a fresh PRAM battery, upgraded the RAM to 128MB (max), replaced the HDD with a 120GB SD card, replaced the noisy fan on the HDD bracket with a super silent one, replaced the 256kb of cache with a 1MB L2 Cache card (this accelerated the 603ev quite a bit) and installed MAC OS 9.2.2. I recently acquired a Sonnet Crescendo G3/L2 350 Mhz/1MB card and wanted to upgrade the TAM with this card. I installed the software v.2.3.1 (which came on floppy with the card) and replaced the 1MB cache card with the Sonnet. I made sure the card was firmly pressed in the slot, however when I turn on the TAM it does not boot. I get the boot chime but the "Happy Mac" icon does not come up (screen does note even light up). I have tried removing the RAM and the IDE HDD to see if these were conflicting with the Sonnet card, but there is no change. I disconnected the PRAM battery so that the PRAM would be wiped clean (and even pressed the little black round button next to one of the RAM slots), but again this made no difference. When I reinstalled the 1MB L2 Cache card the TAM boots normally. I tried installing the Sonnet card several times, but I get the same result. I don't know what else to do. Did I receive a bad Sonnet card? Physically the card looks pristine. Any help would be greatly appreciated. Thank you all in advance. Cheers, Igor