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New England NOS Green 753 Laptop

Covers: Vermont, New Hampshire, Massachusetts, Connecticut, Rhode Island and Maine.
I counted 42 on one side so yeah I guess so. I’ve just gotten Windows 95 installed and no issues or crashes. I bought it because it looked the same as what others in this thread has bought. Was advertised for a compaq armada but looked the same and was pretty cheap, and the RAM chip PNs came back as FPM, so I bought it. Guess it worked out.
IMG_6123.jpeg
 
Interesting that that 84 pin memory works at all. I wonder what the pinout is?

My RAM was definitely 72 pin 3.3v FPM SO-DIMMs. I don't have the machine with me here, so I can't take any pictures until I get home this weekend.

- Alex
 
I'm surprised too. My only guess would be that the extra pins are for some sort of extra data lanes to allow for faster speeds, or something like that?
I’m not gonna question it too much though. If it works, it works.
 
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You have to love when something is designed in a way to allow backwards compatibility. They must have just added more pins to the left and right and kept the pins in the center the same.
 
@DeltaDon do you have any ideas on how to get these machines to stretch output to the whole panel size? There's not a BIOS option for it, though I haven't started to dig into BIOS hacking.

The docs mention that Fn-F11 will do it, but that seems to do nothing. The "switcher" utility says that, once it is launched, ctrl-shift-E will stretch output, but that doesn't seem to work, either.

- Alex
 
Are you talking about in DOS or Windows? Windows video driver should allow changing video image size. Don't know if I've messed around much with DOS of late to remember if video resolution could be adjusted. Did you try installing the video driver in DOS?
 
Don - a lot of video card hardware designed for laptops has a screen expansion mode where it will try to fill the screen even in DOS text mode with various methods. Most notebooks have a BIOS option called expand or similar.

Alex I did try your fn-f11, but it also does nothing for me. I downloaded a datasheet similar to the graphics IC in the system, but didn't spend too much time looking at it.
 
FN-F11 does nothing on my unit as well. I don’t personally mind at all, I prefer black borders to scaling artifacts most of the time.
 
Was looking at CPU options for mine and it lists P54CS, P54LC, which I've found information on, but it also lists P54CSLM, which I really cannot find any information on. I know I was thinking 100 MHz as a throw back to my VERY long gone 486 DX4/100MHz I had, as a teenager, and my addendum lists 100MHz as P54LM 2.9V and P54CSLM 3.1V. So just wondered if anyone knew anything about the CSLM version?
 
I can't answer any of your questions regarding Intel CPU types and that might be best to be started in a new post.

The Green 753 doesn't benefit from using a MMX cpu while do I believe I've run the Intel MMX CPU's in the Green 753 years ago, but don't recall the details. The 233MMX CPU produces a lot of heat. Best solution for finding the Vcc of any Intel CPU is to use the 5 digit code on the CPU and do a look up to determine the proper core voltage. Such as the 166 MHz Pentium SY016 which I find is listed as 3.4-3.6 volts. I do remember that the AMD CPU's didn't post and I'm trying to remember the details of my tests. I believe there was the need to cut off one pin on the AMD's since they are use an extra pin only found on the Socket 7 CPU. A concern is with these laptops is the watts the CPU consumes, the Green 753 uses a heat pipe to cool the CPU and doesn't have a CPU fan. The heat pipe works well for lower watt CPU's, but can cause a lot of heat buildup under the keyboard. I think it is pushed to the limit with the 166 or 200 MHz CPU's.
 
I’m curious to see if my 166MHz chip that’s arriving today will undervolt. I’ve got no idea if chips from this time can benefit from it or not but I might as well try, can’t hurt anything, and at best it could reduce power draw and therefor heat(?) I’m no expert in those sort of things but I do believe that’s how it works.
 
DeltaDon said:
I can't answer any of your questions regarding Intel CPU types and that might be best to be started in a new post.

The Green 753 doesn't benefit from using a MMX cpu while do I believe I've run the Intel MMX CPU's in the Green 753 years ago, but don't recall the details. The 233MMX CPU produces a lot of heat. Best solution for finding the Vcc of any Intel CPU is to use the 5 digit code on the CPU and do a look up to determine the proper core voltage. Such as the 166 MHz Pentium SY016 which I find is listed as 3.4-3.6 volts. I do remember that the AMD CPU's didn't post and I'm trying to remember the details of my tests. I believe there was the need to cut off one pin on the AMD's since they are use an extra pin only found on the Socket 7 CPU. A concern is with these laptops is the watts the CPU consumes, the Green 753 uses a heat pipe to cool the CPU and doesn't have a CPU fan. The heat pipe works well for lower watt CPU's, but can cause a lot of heat buildup under the keyboard. I think it is pushed to the limit with the 166 or 200 MHz CPU's.
Click to expand...
Ok, I will avoid MMX, I was just curious about that 3rd option anyway. Will end up going 100 MHz on it.
 
3lectr1c said:
I’m curious to see if my 166MHz chip that’s arriving today will undervolt. I’ve got no idea if chips from this time can benefit from it or not but I might as well try, can’t hurt anything, and at best it could reduce power draw and therefor heat(?) I’m no expert in those sort of things but I do believe that’s how it works.
Click to expand...
My 166MHz CPU is installed and it successfully posted with the voltage jumpers set to 2.9v. We’ll see if it’s stable, but so far so good! Should in theory keep it running cooler.
 
I believe it is possible that the 166 and 200 non-mmx CPU's could be using the same die for the MMX CPU's. Some came in the same non-ceramic case that the MMX CPU's shipped with. It could be a way for Intel to use defective CPU's. Strange things happened with yield in those days and I won't rule that out. I've never seen anything in print backing up my beliefs. I do remember the days when AMD shipped CPU's with cores turned off and people figured out how to turn them on. Plus removing/installing jumpers on Intel CPU's to change speeds.
 
I've going to have to investigate this since I didn't see this problem back when I had my business. My own G753 is a old used one and not from my stored NOS inventory. I do have a stack of motherboards pulled from NOS laptops I broke up for parts back then. Maybe some will act up in the same manner if I try booting them with a CPU and a test LCD.
 
DeltaDon said:
I've going to have to investigate this since I didn't see this problem back when I had my business. My own G753 is a old used one and not from my stored NOS inventory. I do have a stack of motherboards pulled from NOS laptops I broke up for parts back then. Maybe some will act up in the same manner if I try booting them with a CPU and a test LCD.
Click to expand...
My problem was the CPU wasn't fully seated, then just needed bios reset. Other then that, 1 compact flash adapter failure to detect, have one more to try and then an SD card one, which worked in my Zenith Z-Star EX, I just need to get more SD cards.
 
Quick question - does anyone have any leads on a potential source of main batteries for these? I'm interested in buying one but would hope to find a battery, even one I would have to rebuild
 
There's no way that you're going to be able to find a battery standalone for one of these. You're best off finding a cheap parts unit off eBay you can take the battery from. Unless you want to have it mobile though, there's no need to have one in there. There's a door over the battery bay, thankfully not just a gaping hole.
 
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