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Feeler: Mac Portable max-out RAM upgrade — #17

I know my backlit ram did not work in my non backlit then was reminded that they were different so I did not interchange at all after that. Also the max ram on each is different. …
68kMLA Troubleshooting by Macdrone Sat, 20 Sep 2014 - 04:34

Mac SE smooth body — #6

Thanks, and dad says thanks!  He's much better today than he was earlier this week, but the hospital would not release him today. He will be released on Monday. It was something he…
68kMLA Hardware by Elfen Sat, 20 Sep 2014 - 02:05

Feeler: Mac Portable max-out RAM upgrade — #15

I do want to make the card hold at least 8 Megs. But you dont have to populate all 8 megs. if you want just 1 meg, thats fine. put 1 chip on there, etc etc... 
68kMLA Troubleshooting by techknight Sat, 20 Sep 2014 - 02:05

Mac SE smooth body — #5

Hi Nicole. Hope your da makes a full recovery girl. Tell him theres a big 'shout out' to him from Ireland and to get himself back here asap - we need his brains!!!! weh hey!
68kMLA Hardware by falen5 Sat, 20 Sep 2014 - 01:37

Feeler: Mac Portable max-out RAM upgrade — #14

Thats just it, I dont know. Which is why I am debating whether its worth the effort of designing a card or not.  I know I want 2 of them for myself. But the rest, is up to demand.…
68kMLA Troubleshooting by techknight Sat, 20 Sep 2014 - 01:26

Mac SE smooth body — #4

Actually, this is Elfen's youngest daughter Nicole while he is in the hospital with a severe allergy reaction he's recovering from. Dad has taught his girls a great deal about comp…
68kMLA Hardware by Elfen Sat, 20 Sep 2014 - 01:13

Mac SE smooth body — #3

Cheers Elfen. This machine is 1 of a haul of about 20 macs I got from a guy in cork who spent years 'fiddeling' with macs. When I got there they were all in a mobile home, that wa…
68kMLA Hardware by falen5 Sat, 20 Sep 2014 - 00:59

Feeler: Mac Portable max-out RAM upgrade — #13

trag said: That makes good sense. That's the dream. Run out of chips. Clean out a tiny portion of my attic. They are cool chips. A tiny piece of me squeals, "No, hang on to …
68kMLA Troubleshooting by wilykat Fri, 19 Sep 2014 - 23:46

Feeler: Mac Portable max-out RAM upgrade — #12

techknight said: The Toshiba has a weird little setup which is A-1, and its shared with I/O16. It appears I/O16 becomes A-1 in byte mode. But A-1 is not A1. And it doesnt rea…
68kMLA Troubleshooting by trag Fri, 19 Sep 2014 - 23:36

Feeler: Mac Portable max-out RAM upgrade — #11

techknight said: The portable and backlit portable both use 100ns ram. This is my first time making a ram expansion so if I have the logic wrong its a simple matter of moddi…
68kMLA Troubleshooting by trag Fri, 19 Sep 2014 - 22:33

Feeler: Mac Portable max-out RAM upgrade — #10

The Toshiba has a weird little setup which is A-1, and its shared with I/O16. It appears I/O16 becomes A-1 in byte mode. But A-1 is not A1. And it doesnt really explain what A-1 ac…
68kMLA Troubleshooting by techknight Fri, 19 Sep 2014 - 22:12

Feeler: Mac Portable max-out RAM upgrade — #9

The portable and backlit portable both use 100ns ram. This is my first time making a ram expansion so if I have the logic wrong its a simple matter of modding the VHDL and flashin…
68kMLA Troubleshooting by techknight Fri, 19 Sep 2014 - 21:51

Mac SE smooth body — #2

Typical SE, though the scratches and other things on the board looks like somebody tried to tamper or repair it and did not know what they were doing. Fourth pic down, looks like …
68kMLA Hardware by Elfen Fri, 19 Sep 2014 - 21:41

Feeler: Mac Portable max-out RAM upgrade — #8

techknight said: I would rather have the Toshiba SRAMs trag. Why? Less CPLD lines I need the better. I will end up using an XC9572XL CPLD as the memory address chip select d…
68kMLA Troubleshooting by trag Fri, 19 Sep 2014 - 21:27

Feeler: Mac Portable max-out RAM upgrade — #6

I would rather have the Toshiba SRAMs trag. Why? because they are 16 bit and plus they have both an upper and lower byte access mode. This is a requirement for the 68000 as there i…
68kMLA Troubleshooting by techknight Fri, 19 Sep 2014 - 20:47

Feeler: Mac Portable max-out RAM upgrade — #5

The portable keeps the card hot at all times however there is a standby signal. But I wouldnt use it. 3.3v logic isnt a problem. The question really wasnt about the design. More a…
68kMLA Troubleshooting by techknight Fri, 19 Sep 2014 - 20:40

Feeler: Mac Portable max-out RAM upgrade — #4

i'd deffinatley buy one since i only have a 1mb card for my portable and as the onboard ram is bad there is a good chance the upgrade card might be bad aswell Even at $6.88 a chip…
68kMLA Troubleshooting by max1zzz Fri, 19 Sep 2014 - 20:35

Feeler: Mac Portable max-out RAM upgrade — #3

techknight said: I have been thinking, I was going to design and build a RAM expansion card for the portable, with the potential to max it out at 9MB.  Question is, would an…
68kMLA Troubleshooting by trag Fri, 19 Sep 2014 - 19:24

Feeler: Mac Portable max-out RAM upgrade — #2

Isn't the Portable's RAM actually psuedo-static, not static? Just spitballing, but if you could make a board that could take a BGA here's a 4Mx16 70ns Psuedo-RAM that's $5 a head: …
68kMLA Troubleshooting by Gorgonops Fri, 19 Sep 2014 - 19:02
mp.ls