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I ran PowerBook 1400c modified upgrade memory board tests today.
The boards were modified for me by
CayMac Vintage who also did my SE/30 board reload. The tests were for 2 modified upgrade RAM boards, each tested separately.
My plan was for the 2 memory expansion boards to be increased from 8 MB each to 24 MB each and
use them together for a total of a 48 MB upgrade and with the 16 MB already in the factory specs that
should equal 64 MB total. I now have partial success in the test results which were a little surprising.
![Installing memory upgrade board for an Apple Powerbook 1400c laptop.](https://www.computerhobbyshop.com/images/1400c_memory.jpg)
I labeled the 1st modified upgrade board #1. It used to have 8 MB, whereas it supposedly now has enough chips to be a total of 24MB.
It boots with Error Message at start up.
It will finish booting but still only shows 8 MB. It seems the Powerbook 1400c can see there is more memory but due to a testing error, cannot pass the test of it all during the startup memory testing phase.
![Memory Count low on Apple Powerbook 1400c laptop RAM upgrade.](https://www.computerhobbyshop.com/images/1400c_RAM_count_too_low.jpg)
The 2nd modified upgrade board I labeled #2 also used to have 8 MB, and it supposedly now has enough chips to be a total of 24 MB as well. It will boot without any error at startup but after booting only shows 16 MB and works OK with my onboard memory for a total of 32 MB.
![Board 2 Memory Count also low on Apple Powerbook 1400c laptop RAM upgrade.](https://www.computerhobbyshop.com/images/1400c_RAM_count_too_low_for_board_2.jpg)
It seems the Powerbook 1400c can count twice the RAM than before on board #2, but it cannot count all the RAM during the startup memory testing phase, and possibly it ignores any discrepancy altogether so I get no error message at all. The fact that I got double the memory and no error during the test phase means we were on the right track, and only one-third of the RAM is not being detected at all.
Results: All I can get working right now is 24 MB total using only modded expansion board #1...
![Total RAM count 24 MB with Apple Powerbook 1400c laptop RAM upgrade board 1.](https://www.computerhobbyshop.com/images/1400c_Total_RAM_with_upgrade_board_1.jpg)
... OR ...32 MB total using only expansion board #2, which is the same total I got using both 8 MB boards before the modifications.
![Total RAM count 24 MB with Apple Powerbook 1400c laptop RAM upgrade board 2.](https://www.computerhobbyshop.com/images/1400c_Total_RAM_with_upgrade_board_2.jpg)
At present, I cannot install both modules at the same time as the height is too much. It seems the Apple factory-supplied upgrades must have come with half-height RAM chips, (something I did not know before). Not knowing about the space available beforehand made buying full-height RAM my mistake.
Also, today I saw this 1400c with 64 MB on eBay,
which is very rare as it has the total possible upgraded RAM already.
![Max RAM Count 64 MB on Apple Powerbook 1400c on eBay.](https://www.computerhobbyshop.com/images/1400c_with_64_MB_on_eBay.jpg)
I would buy it if possible even just to learn what the official upgrade looks like, but sadly, if you ever see a memory upgrade like it has, the prices seen just for upgrades seems crazy & simply insane!
For now, I'm inviting everyone to CayMac Vintage to see Will Jacobs page at
ko-fi.com/caymacvintage
![See CayMac Vintage at ko-fi.com/caymacvintage](ko-fi_CayMac_Vintage.jpg)
I'll try more later but for right now this is just the current Powerbook memory test results. With the holidays almost here, I'm out of time to work on the SE/30 reload that was sent back to me but I will get to it later. I'm very thankful for the help from Will Jacobs and wish to again say happy holidays!
See my top project right now at computerhobbyshop.com/#Top_Projects
eol
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