Got a load of 68000 CPU's

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exxos
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Got a load of 68000 CPU's

Post by exxos » Fri Jul 06, 2018 4:29 pm

Managed to get a new reel of 68000 PLCC CPUs. Freescale ones so should be later production runs. I got a few to try out a few weeks ago and most ran at 32MHz. So got them as I need them for my store and STE boosters... Now the fun task of trying them all out :roll:

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Re: Got a load of 68000 CPU's

Post by Forgottenmyname » Sat Jul 07, 2018 10:24 am

How many are on that roll?

Would have cost a fortune back in the day.

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Re: Got a load of 68000 CPU's

Post by exxos » Sat Jul 07, 2018 10:45 am

Forgottenmyname wrote:
Sat Jul 07, 2018 10:24 am
How many are on that roll?

Would have cost a fortune back in the day.
I've not counted them, probably around 200. I got about 100 before that a few weeks ago as well.
Yeah they are not exactly expensive per chip, but buying 100's of them.. then postage costs etc. I was having a hard time finding them lately, so bulk brought some before they vanish. Mostly just for STE machines, ultimately after the current STE boosters I doubt I will be using the PLCC again in favour for the SEC CPU. Anyway, I've tested about 20 so far, and 4 failed, thats pretty bad going :roll:
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

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Re: Got a load of 68000 CPU's

Post by Forgottenmyname » Sat Jul 07, 2018 1:28 pm

What failed all together or just not to 33mhz?

1 in 5 failure rate ain't great but depends what you paid I guess?

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Re: Got a load of 68000 CPU's

Post by exxos » Sat Jul 07, 2018 2:56 pm

Forgottenmyname wrote:
Sat Jul 07, 2018 1:28 pm
What failed all together or just not to 33mhz?

1 in 5 failure rate ain't great but depends what you paid I guess?

Failed all together. Though I factor in failures into the final costs of things anyway. Some looks like some black tarnishing on odd pins, wont come off with IPA. I just binned them, not worth the risk selling/using iffy CPUs.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
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Forgottenmyname
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Re: Got a load of 68000 CPU's

Post by Forgottenmyname » Sat Jul 07, 2018 6:07 pm

Can't help but think a possible 40 failures out of 200 as a waste but as you say, you need to sell on parts you can trust.

And I presume the cost per part made it uneconomical to spend too much time cleaning?

Did you try flux and a brillo type pad?

Me.... I'm too tight to throw anything away :mrgreen:

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Re: Got a load of 68000 CPU's

Post by Nimrod » Sat Jul 07, 2018 10:27 pm

IPA is great for dissolving flux but is probably not good in this case.

If you have some kind of polymeric gunk I would try a q-tip dipped in 100% acetone (has to be water free).
Acetone dissolves or at least softens a range of plastics. IPA or ethanol will not make a dent!

And of course: Never use acetone anywhere near plastics, circuitboards or well... your Atari in general.

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Re: Got a load of 68000 CPU's

Post by exxos » Sun Jul 08, 2018 12:55 pm

I will try a fibre pen if I see any tarnished ones next time. Though I think the pins on a couple looked fine anyway. Would really need to get under my magnifier and check pin alignments and tarnishing etc.. But of course its all time involved and testing, cleaning-checking, re-testing, but really, can they still be trusted even if they do work..

I do have a quick check on the ones which don't work anyway.. But no use spending lots of time just for a CPU which isn't worth all that much anyway. Costs do ramp up with large batches of course, and I "lose" a lot of capital that way. ultimately I will (hopefully) recover the costs in the end when all the CPU's have sold.

Though main problem is time, do I bin potentially 40 cpus, and spend time doing more constructive work like pcb design.. or spend some time trying to get all the cpus to work... Can't do both..

So chucking stuff out may not be cost-effective, but that is the "Cost" of doing pcb work instead. ultimately failures are taken into account of the final selling price anyway. Same with any kit I sell really. Things like my V2.2 booster, 6 layer boards are not cheap, and some did fail. They went in the bin. Though such failures are taken into account in the final price. It makes huge investment and risk on my part, I already wrote much about that.

Its hard to find time to work on designs these days, mix in running my store, doing repairs for people, time for new projects is almost nothing. So while I may only gain a day in not testing CPU;'s, its a day where I can do a lot of PCB design instead.. If I can only find a couple days a month for a particular project, then a day saved is like 50% more time I can work on that project.

All gets pretty complicated. Though its always time vs cost type of thing.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

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