mwm@ucbopal.berkeley.edu (Mike Meyer) (06/23/86)
I just made the MC68010 upgrade, following Thad Floryan's instructions to be found on Fish disk #18. There was only one problem, of the "I should have know better" sort. Since it can bite even the most experienced hardware tech (which doesn't describe me) as well as the hardware naive (which is closer to what I am), I thought I'd describe it to the net, in the hopes that others would avoid it. If you understand which directions chips go on a board, you can skip this paragraph. If not, then dig out a chip - any chip. At one end should be a notch in the chip. This marks the end where pin 1 is. When replacing a chip, you should note which end the notch is on, and put the replacement in with the same orientation. Almost universally, all chips on a board have the same orientation. On the Amiga motherboard, the 68K CPU is upside down compared to the rest of the chips. I made the blunder of pulling the chip before checking, then putting the 68010 in upside down (after all, that's the orientation everything else on the board had....). Reinserted the 68000 the same way, and got rather upset when it didn't work. After some gnashing of teeth, I decided to see if someone had been scumbag enough to put the 68K on the board upside down. Sure enough, it works. I'm typing this on a 68010-based Amiga. Happy hacking, <mike
daveh@cbmvax.cbm.UUCP (Dave Haynie) (06/25/86)
> > > I just made the MC68010 upgrade, following Thad Floryan's instructions > to be found on Fish disk #18. There was only one problem, of the "I > should have know better" sort. Since it can bite even the most > experienced hardware tech (which doesn't describe me) as well as the > hardware naive (which is closer to what I am), I thought I'd describe > it to the net, in the hopes that others would avoid it. > > If you understand which directions chips go on a board, you can skip > this paragraph. If not, then dig out a chip - any chip. At one end > should be a notch in the chip. This marks the end where pin 1 is. When > replacing a chip, you should note which end the notch is on, and put > the replacement in with the same orientation. Almost universally, all > chips on a board have the same orientation. > > On the Amiga motherboard, the 68K CPU is upside down compared to the > rest of the chips. I made the blunder of pulling the chip before > checking, then putting the 68010 in upside down (after all, that's the > orientation everything else on the board had....). Reinserted the > 68000 the same way, and got rather upset when it didn't work. After > some gnashing of teeth, I decided to see if someone had been scumbag > enough to put the 68K on the board upside down. Sure enough, it works. > I'm typing this on a 68010-based Amiga. > > Happy hacking, > <mike It nice when you CAN put all of the chips in the same direction, but its not really that feasable on some of today's PC boards, like the Amiga. The Amiga PCB tries to squeeze in quite a bit on to a 2-layer board, while still having have enough ground plane to pass FCC as a consumer product. Reversing the 68000 I'm sure would have been a layout nightmare even on a 4 layer board. We did the same thing in the C128; several chips are reversed from the direction you'd expect, mainly for layout simplicity. This causes no problem in assembly as everything is inserted by machine. And at least on the C128, every chip's orientation is indicated by the PCB silkscreen, and by a notch in the socket if its a socketed chip. -- /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ Dave Haynie {caip,ihnp4,allegra,seismo}!cbmvax!daveh A quote usually goes here, but its currently being rennovated. These opinions are my own, though for a small fee they be yours too. \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
mykes@3comvax.UUCP (Mike Schwartz) (06/25/86)
> > I made the blunder of pulling the chip before >checking, then putting the 68010 in upside down (after all, that's the >orientation everything else on the board had....). Reinserted the >68000 the same way, and got rather upset when it didn't work. After >some gnashing of teeth, I decided to see if someone had been scumbag >enough to put the 68K on the board upside down. Sure enough, it works. >I'm typing this on a 68010-based Amiga. > > Happy hacking, > <mike I do not claim to be a hardware expert either, but when you hold a chip so that the notch is poining straight up (the pins pointing away from you), the top pin on the left is pin #1, the one below that #2, etc. When you hit the bottom of the left side, the next pin is the bottom one on the right, and you continue numbering as you go UP that side. Also, the sockets that chips are plugged into should have some identifying mark as to which pin is pin #1, typically a similar notch to the one on the chip. I hope this helps ... So how much is a 68010 anyway? Is it as simple as pulling the 68000 and putting in the 68010 or is there more to it? (I don't have disk #18)...
tainter@ihlpg.UUCP (Tainter) (06/28/86)
> I do not claim to be a hardware expert either, but when you hold a chip > so that the notch is poining straight up (the pins pointing away from you), > the top pin on the left is pin #1, the one below that #2, etc. When you > hit the bottom of the left side, the next pin is the bottom one on the > right, and you continue numbering as you go UP that side. Also, the sockets > that chips are plugged into should have some identifying mark as to which > pin is pin #1, typically a similar notch to the one on the chip. I hope > this helps ... > So how much is a 68010 anyway? Is it as simple as pulling the 68000 and > putting in the 68010 or is there more to it? (I don't have disk #18)... Fine if the sockets were put in in the correct orientation. I seem to recall something about IBM PC sockets not neccesarily in the correct orientation. --j.a.tainter
adp@hp-sdd.UUCP (Tony Parkhurst) (06/30/86)
Would someone please post the info to do the MC68010 upgrade. Is there
anything more than just swapping processors? Anything to be especially
carefull of? Anyone who has done the upgrade, have you noticed any
improvement?
-- Sparky
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* Tony Parkhurst -- {hplabs|sdcsvax|ncr-sd|hpfcla|ihnp4}!hp-sdd!adp *
* OR hp-sdd!adp@nosc.arpa *
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