Yup, about mid-way. I would assume this could happen with an upgrade card when a driver loads. But odd on stock hardware. So not sure. It detected the defect and did not use the RA…

It said something about detecting a hardware defect later in the startup process? I'm intrigued now... how did it say it?

Well after reseating it a few times it now works. Looks like my base RAM is 16MB and the chip is 8MB for 24 total. Well back on the shelf I guess.

Im going to assume there is some defect with the RAM card I installed. But what threw me off is that it boots then halfway through startup it pauses to say something about a memory…

I started another thread in the hack section, Since its more of a project than a "Feeler"  now. 

Guys, I have a discrepancy here.  Designing cards and drivers for macintosh, and the original portable developer notes list the slot like this:  but...  Guide to the macintosh…

Technight... we are all chomping at the bit!!! Can't wait!!!

my CPLD development board came in today. Cool little thing. Now just waiting on the JTAG.  better start working on the PCB layout, but I need to come up with a footprint/pin for t…

I'd be in for two also, it sounds like it's coming along well.

I am sure you do Techknight.. I am sure you do!!! Sign me up to purchase your product!!! I know others that will buy too.. And of course I bet a ton of people on here.. Uni prob…

the only way to expand it past 5MB is to use the PDS slot.  Well, I got other ideas.... 

Hey TechKnight… So I've got a Kingston 4MB card for a 5126 and three.. yes that is three weird RAM upgrades that bring my 5120's and 5126's up to 7MB.. I haven't figured out how to…

I have a velcro strap rack designed for shipping TSOPs.  it has 26 I think AM29LV320 FLASH TSOPs in it.  Those TSOPs I cant use, maybe I can ship the carton to you and you can fi…

techknight said: That was fast... RAM is already here. Looks like most suffered pin damage though, so well see. Click to expand... Dog gone it. Well that packing method i…

That was fast... RAM is already here. Looks like most suffered pin damage though, so well see.  Now I am just waiting on the CPLD stuff. Coming from china so thats going to take a…

techknight said: Well the backlit has a timing requirement of 0-wait states. Meaning the DTACK has to be handled almost instantly upon a chip select or address strobe. Cli…

I didn't have any luck finding them on his page either... I went to an locally owned Ace Hardware here in Boise to get some keys cut for work and found some brown 3M replacements …

I found the designing cards and drivers for macintosh family online.  It appears BOTH the portable and backlit portable GLU will only decode and DTACK 5MB of address space. So for…

the UDS/LDS data strobes go low after valid data is on the bus to be written. So when these lines get toggled, and address strobe gets toggled for a write, I know then that the dat…

Well the backlit has a timing requirement of 0-wait states. Meaning the DTACK has to be handled almost instantly upon a chip select or address strobe. When I am outside of the 5MB …

Just checking to see if I understand this. On one Portable type (non-backlit) there's an ASIC which does house-keeping for RAM accesses.   When the RAM address space is accessed, …

I am. There was a video card I think . Hap has one

I am not aware of anything ever using the PDS slot on a portable. 

So a full upgrade plus empty PDS slot? Was there good PDS upgrade board or something useful?  If so, this RAM upgrade would be quite popular!

Really? Hap has a rom card. For one of his portables.