68kMLA Supporter TimHD Posted January 8 68kMLA Supporter Report Share Posted January 8 Speaking of which, is there an authoritative guide to finding legit CPUs - esp the 68040 non-LC 40mhz ones? Did I see once that they no longer make them hence it’s about finding old ones and avoiding fakes/screen printed variants that are slower or actually LC chipsets? Quote Link to post Share on other sites
68kMLA Supporter Kai Robinson Posted January 8 68kMLA Supporter Report Share Posted January 8 @TimHD I use UTSource - plenty of L88M mask Freescale 040's there for about $59 each. Quote Link to post Share on other sites
tokyoracer Posted January 8 Report Share Posted January 8 Oh that's very, VERY nice Bolle. you always find ways to out-do yourself with yet another amazing example to reverse engineering. I don't know how you do it! Definitely still up for a Cache add-on for my Carrera that's sitting in my IIci. To be honest, money-no-object, I'd really love another complete set to put in my IIvx, but really that would probably be a bit wasted in that and would be nothing more then morbid fun to see the lackluster results. Quote Link to post Share on other sites
demik Posted January 8 Report Share Posted January 8 (edited) Very nice ! How does this fit an Iicx ? Do you need another extra board ? Edited January 8 by demik Quote Link to post Share on other sites
68kMLA Supporter jessenator Posted January 8 68kMLA Supporter Report Share Posted January 8 5 hours ago, demik said: How does this fit an Iicx ? Do you need another extra board ? This post shows the MicroMac IIcx adapter for the Carrera Might be a bit of unobtanium these days... Quote Link to post Share on other sites
demik Posted January 8 Report Share Posted January 8 Thanks ! Looks only simple traces to create a PDS slot. Should be straightforward to replicate Quote Link to post Share on other sites
pcamen Posted January 8 Report Share Posted January 8 3 hours ago, jessenator said: This post shows the MicroMac IIcx adapter for the Carrera Might be a bit of unobtanium these days... I gave away two of them a month or two ago. Quote Link to post Share on other sites
68kMLA Supporter trag Posted January 8 68kMLA Supporter Report Share Posted January 8 13 hours ago, Bolle said: I am using a MC88916DW80 which is rated at a maximum of 40/80MHz for the B- and P-clock respectively. The exact same clock generator (although at a lower speed rating) is also found on some Macintosh logicboards. I have seen Turbo040s with 35/70MHz and lower 25/50MHz rating as well. All Carreras I have seen so far have used the 40/80MHz version. Well, if you find a use for the slower ones, I have a reel of 998 of the MC88916DW55... Quote Link to post Share on other sites
68kMLA Supporter Kai Robinson Posted January 8 68kMLA Supporter Report Share Posted January 8 Those are available at https://www.utsource.net/sch/MC88916DW80.html - £2.49 a piece or £2.12 a piece if you buy 10 or more... Quote Link to post Share on other sites
68kMLA Supporter Frobozz Posted January 9 68kMLA Supporter Report Share Posted January 9 Amazingly cool. Quote Link to post Share on other sites
Bolle Posted January 9 Author Report Share Posted January 9 19 hours ago, demik said: Thanks ! Looks only simple traces to create a PDS slot. Should be straightforward to replicate I can provide the schematics of the Micromac IIcx adapter if you want. Got one of those as well. Also mind you will need the more uncommon socketed IIcx logicboard unless you are ready to desolder the CPU on your logicboard and put a socket in place. Quote Link to post Share on other sites
demik Posted January 9 Report Share Posted January 9 (edited) 6 hours ago, Bolle said: I can provide the schematics of the Micromac IIcx adapter if you want. Got one of those as well. Also mind you will need the more uncommon socketed IIcx logicboard unless you are ready to desolder the CPU on your logicboard and put a socket in place. Thanks ! I got two IIcx, one socketed, one soldered. The socketed one isn't starting yet (recap done), Don't want to mess with the working one, I will keep your offer in mind. Good job anyway ! Edited January 9 by demik Quote Link to post Share on other sites
Bolle Posted January 18 Author Report Share Posted January 18 Also for bragging rights: No external cache though at that speed, so you're still slower than a 40MHz 040 with 128k external cache. Benchmark speed of the cacheless 50MHz 040 in a SE/30 is in the range of a 50MHz 030 with external cache. Quote Link to post Share on other sites
tokyoracer Posted January 18 Report Share Posted January 18 Now that's a fast SE/30! Can we see some Speedometer readings? Quote Link to post Share on other sites
Bolle Posted February 1 Author Report Share Posted February 1 On 1/8/2021 at 8:43 AM, Kai Robinson said: @TimHD I use UTSource - plenty of L88M mask Freescale 040's there for about $59 each. Well... the "L88M"s I got from utsource were reprinted. The mask they printed on there was made up and a 2012 datecode also doesn't make too much sense: Quote Link to post Share on other sites
68020 maceffects Posted February 1 68020 Report Share Posted February 1 (edited) Its sad that these companies have to fake stuff like that. I can’t really see much reward for them doing it either. 90% of people using vintage stuff will know it’s fake. Unless this fake was made 20-25 years ago. Edited February 1 by maceffects Quote Link to post Share on other sites
68kMLA Supporter pax Posted February 1 68kMLA Supporter Report Share Posted February 1 (edited) 4 hours ago, Bolle said: Well... the "L88M"s I got from utsource were reprinted. The mask they printed on there was made up and a 2012 datecode also doesn't make too much sense: I had the same experience with them last week. They refunded me at least. Edited February 1 by pax Quote Link to post Share on other sites
olePigeon Posted February 1 Report Share Posted February 1 What are they, then? LC040s? Quote Link to post Share on other sites
Bolle Posted February 1 Author Report Share Posted February 1 The ones I got do have a FPU, so they are some kind of full 040. They also don’t seem to run as hot as most of the other chips I have around but they’re far from being what I would consider cold running. They are rock solid at 40MHz though and at least one of them also seems to take 50MHz just fine as well. Still trying to see if they’re going to refund me because there’s obviously some faking going on here even if the prices weren’t actually too bad even for what I got considering they run fine at 40MHz. Quote Link to post Share on other sites
68kMLA Supporter pax Posted February 1 68kMLA Supporter Report Share Posted February 1 Mine is also a full 040. No idea how they source these chips and where in the supply chain the faking is happening. I sent them a screenshot of the original listing and said that the item I received was incorrect and runs too hot for my purposes. I received a full refund and they did not ask me to return it. I never called it out as a fake, I just said it was the wrong mask, which they didn't argue with. Quote Link to post Share on other sites
68kMLA Supporter Kai Robinson Posted February 2 68kMLA Supporter Report Share Posted February 2 On 2/1/2021 at 11:02 AM, Bolle said: Well... the "L88M"s I got from utsource were reprinted. The mask they printed on there was made up and a 2012 datecode also doesn't make too much sense: UTSource will refund you for that - definitely. They actually want to have a decent reputation. Raise a dispute already? Quote Link to post Share on other sites
Bolle Posted February 2 Author Report Share Posted February 2 (edited) 4 hours ago, Kai Robinson said: Raise a dispute already? I did, they're working on it. That said, everything else I got with that order was perfect. Edited February 2 by Bolle Quote Link to post Share on other sites
68kMLA Supporter Kai Robinson Posted February 2 68kMLA Supporter Report Share Posted February 2 I was also going to say, i got a batch of MC88916DW80's if you need them. Quote Link to post Share on other sites
tattar8 Posted April 3 Report Share Posted April 3 (edited) This is amazing. Are you planning to make the gerbers for the accelerator available like you did the cache card? Edit: didn't realize this thread was 2 months old. Edited April 3 by tattar8 Quote Link to post Share on other sites
M777 Posted April 3 Report Share Posted April 3 If you ever start selling these accelerator cards I’ll definitely buy one. I happen to have a spare 040 lying around! Well done Quote Link to post Share on other sites
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