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The official 755 Upgrade and general information Topic

Older ThinkPads.. from the 600, the 7xx, the iSeries, 300, 500, the Transnote and, of course, the 701
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Thinkpad4by3
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Re: The official 755 Upgrade and general information Topic

#61 Post by Thinkpad4by3 » Thu Jul 05, 2018 7:52 pm

1) What pieces are broken
2) a) How are you planning to use an ISO
B) note: most drives pre-1998 are picky about burned discs.
3) 755C's are very common. You'll find one.
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The efficiency of two screens equally sized with equal numbers if pixels are equal. The time spent by a 4:3 user complaining about 16:9 is proportional to the inefficiency working with a 16:9 display, therefore the amount of useful work extracted is equal.

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Re: The official 755 Upgrade and general information Topic

#62 Post by BillMorrow » Sat Jul 07, 2018 3:14 am

i'll look for the box.. it's downstairs with a metric ton of thinkpad stuff..
the iso is on my NAS..
my upload speed is 10mbps..
i suppose i can zip it up into several parts.. where to send it and can you receive it..? without some timeout or the like..? or use some sort of site that will receive your files.. it is 500mb MOL..
Bill Morrow, kept by parrots :parrot: & cockatoos
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She was not what you would call refined,
She was not what you would call unrefined,
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NikNak
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Re: The official 755 Upgrade and general information Topic

#63 Post by NikNak » Mon Jul 09, 2018 8:24 pm

Thinkpad4by3 wrote:
Thu Jul 05, 2018 7:52 pm
1) What pieces are broken
2) a) How are you planning to use an ISO
B) note: most drives pre-1998 are picky about burned discs.
3) 755C's are very common. You'll find one.
The rear panel cover is missing (assuming it broke off, I hear that's common on these), the left lid latch is broke so the screen only latches on one side, and the left flip out foot on the bottom is missing.
Well, I was hoping to get a disc image of windows 95 and 98se so I can put them on a 3.5 floppy (for the 755c) and a cd (for my other thinkpad 2611) to reinstall it after I wipe the harddrive.
Do they have a problem with floppy's too?
and yes I'm keeping my eye out for one, thanks! :)

NikNak
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Re: The official 755 Upgrade and general information Topic

#64 Post by NikNak » Mon Jul 09, 2018 8:27 pm

BillMorrow wrote:
Sat Jul 07, 2018 3:14 am
i'll look for the box.. it's downstairs with a metric ton of thinkpad stuff..
the iso is on my NAS..
my upload speed is 10mbps..
i suppose i can zip it up into several parts.. where to send it and can you receive it..? without some timeout or the like..? or use some sort of site that will receive your files.. it is 500mb MOL..
That would be awesome thank you!
Could we use DropBox or Google Drive?

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Re: The official 755 Upgrade and general information Topic

#65 Post by BillMorrow » Sat Jul 28, 2018 3:13 am

you have to remind me to go digging..
Bill Morrow, kept by parrots :parrot: & cockatoos
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She was not what you would call refined,
She was not what you would call unrefined,
She was the type of person who kept a parrot.
~~~Mark Twain~~~

ugzz
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Re: The official 755 Upgrade and general information Topic

#66 Post by ugzz » Thu Dec 13, 2018 12:48 am

Hey all, just signed up and this forum seems like a fantastic resource! Been a lurker since before i even purchased a 755, finally a snagged a 755cd in FANTASTIC shape at a fair price.

So mine came with Two hard drives, a 300MB and an 800. (not exact number, i think its a 320 and an 810 or something along those lines).
The larger of the two has the stock image, but it might be toast. It boots up, but i clicked on the midi player and all i got was "file corrupted" errors. But most other stuff did seem to open without issue.

So before i even messed with it too much, i wanted to back it up. I found my old 2.5" ide to USB adapter, pulled the drive, and was able to extract it from the caddy without too much hassle. However when i try to connect it to my system it detects as a 576GB IBM. I thought maybe it was windows 10 being screwy so i threw it on an older linux box, and same thing. I tried a different 2.5" ide adapter, and same again.
Given the failed detection, i also can't get anything to come up. Each system just tells me it needs formatted. I tried to run a linux clone tool that can clone an unformatted and unmounted drive, but it wanted me to free up 576GB to start. So i didn't even bother attempting.

Just wondering if anyone else has seen any behavior like this, or has has ideas or thoughts.
Thanks!

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Re: The official 755 Upgrade and general information Topic

#67 Post by BillMorrow » Thu Dec 13, 2018 1:29 am

just to let others know i have a box of about 5 or 6 755 series thinkpads..
i also have a pristine and very rare 755CDV..
if any interest in buying some or all, let me know..
Bill Morrow, kept by parrots :parrot: & cockatoos
Sysop - forum.thinkpads.com

*
She was not what you would call refined,
She was not what you would call unrefined,
She was the type of person who kept a parrot.
~~~Mark Twain~~~

ugzz
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Location: Homestead, PA USA

Re: The official 755 Upgrade and general information Topic

#68 Post by ugzz » Thu Dec 13, 2018 8:00 pm

I should note that i had my info backwards. the 810MB drive had the factory image, the 320 had a custom w95 with seemingly all drivers installed on it. I was actually more interested in the "clean" w95 since the drivers were in and it was a small installation. But that's the drive that detects as 576GB and i can't access it anywhere. The 810MB boots great, mounts great, and i was able to image it no problem using 2.5 IDE -> 3.5 IDE -> USB adapters. I have the image saved and backed up and have no problem sharing, but I made it in Linux Mint with the built in "Disks" tool. It's an IMG format, and when double clicked in mint you simply get a "restore to" box and can choose a drive. Not sure if that's useful to anyone or not, but lmk. And If anyone has any ideas about my 320mb drive that detects as a 576GB get at me, Thanks!

Thinkpad4by3
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Re: The official 755 Upgrade and general information Topic

#69 Post by Thinkpad4by3 » Thu Dec 13, 2018 8:25 pm

ugzz wrote:
Thu Dec 13, 2018 8:00 pm
Not sure if that's useful to anyone or not, but lmk. And If anyone has any ideas about my 320mb drive that detects as a 576GB get at me, Thanks!
I tried my 755C's 340mb drive which won't mount but my 810MB toshiba drive will. I believe it has something to do with the 340 being a CHS drive and the 810 being an LBA drive.

How to mount a CHS drive though? I got no clue past a very old machine and laplink.
Thinkpad4by3's Law of the Universe.

The efficiency of two screens equally sized with equal numbers if pixels are equal. The time spent by a 4:3 user complaining about 16:9 is proportional to the inefficiency working with a 16:9 display, therefore the amount of useful work extracted is equal.

ugzz
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Re: The official 755 Upgrade and general information Topic

#70 Post by ugzz » Sat Dec 15, 2018 3:02 pm

Thinkpad4by3 wrote:
Thu Dec 13, 2018 8:25 pm
I tried my 755C's 340mb drive which won't mount but my 810MB toshiba drive will. I believe it has something to do with the 340 being a CHS drive and the 810 being an LBA drive.

How to mount a CHS drive though? I got no clue past a very old machine and laplink.
Yeah i think you nailed it. I did a bit more research and all i can find is a few places where someone has posted that it's possible to convert the lba detection to CHS, but from the data i'm seeing that's a task beyond my skillset. The few have done it don't seem to have posted any scripts or info beyond claiming it can be done.

-I'm not sure if this is anything, but i did just realize that fdisk lets you specify C H S for a drive. I read that CHS drives would have the CHS info printed on it, but these IBM 344MB drives don't. I'm not sure if that info is in the bios or anywhere else.. but i'm interested to at least poke a round a bit more.

AntoniE
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Re: The official 755 Upgrade and general information Topic

#71 Post by AntoniE » Sun Dec 23, 2018 4:52 pm

Hi ugzz,

I have a 810MB HD, but I do not seem to see any IDE->USB convertor as the connector on the disk (which actually seems to be in a plastic box) has beveled sides (like a trapezium) - as it fits the 755 motherboard connector. Is there some magic to connect to this 'strange' connector?

On your CHS / LBA / 320MB - 576GB (your really mean 'G' ?) - did you ever try to connect it with the USB (or direct) to a linux machine and run gparted on it?
I just used gparted to partition on an old ASUS machine a sick HD so that it became totally empty. Then with a dos boot diskette and FDISK /mbr you can get it to work under dos again (gparted loads grub in the master boot record (mbr) which fdisk /mbr takes away). Grub does not seem to like fat16 - as it boots into grub rescue.
You could also put the disk in the 755 and work with a bootable gparted diskette. (3.5") or cd.

I expect that in this CHS disk (cylinder/head/sector) the data in the mbr is interpreted as if it is a LBA - which gets your very strange results. 340MB with 512 byte blocks turns into 696'320 blocks. However, in the CHS addressing method ( https://en.wikipedia.org/wiki/Cylinder-head-sector ) S is pretty much always 63*512 bytes ( 32'256 bytes). On a 340MB disk the cylinders x heads should then together be 340*1024*1024/32246=11'056. Which would be 1024 cylinders and 10 heads. The 576GB disk would have 1'207'959'552 blocks. In binary: 0100 1000 0000 0000 0000 0000 0000 0000. 10 in binary is 1010, 1024 is 0100 0000 0000. It depends on how the control blocks in the mbr are arranged exactly, but I can understand that a CHS control block read as a LBA, especially if after the CHS control info there are some bytes with zero's that this can happen - approximately. If you do not need the data on the CHS disk, I would give up the free space and do a re-format. May-be even the dos fdisk /mbr helps already - as that will overwrite (part) of the master boot record ( the first 512 byte block or the first sector of the first head of the first cylinder). I do not know whether you can do a fdisk /mbr in windows.

Thanks - Antoni

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Re: The official 755 Upgrade and general information Topic

#72 Post by BillMorrow » Tue Jan 15, 2019 4:25 am

i see i've been here before..
NOTE:it is way past my bedtime so i'll be terse/brief..
the 755 hard drives were in a difficult to open caddy.. the pluig you see is not the HDD's..
i made up, 20+ years ago an adapter of some sort using the plug you can see..
i forgot what i made it for, maybe to interface a 3.5 inch drive to the 750 series thinkpads..
it was a LOT of work soldering.. :)
i'm ready to throw all that stuff OUT..
also have a few of those caddys.. maybe.. 750 series and 770 series..
to hook one of those old drives you need to get an old USB IDE (or whatever) adapter.. try amazon first.. i think bezos will be needing the business.. :)
i forgot all the rest of what i knew at that time..
BED is demanding my presence..
Bill Morrow, kept by parrots :parrot: & cockatoos
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*
She was not what you would call refined,
She was not what you would call unrefined,
She was the type of person who kept a parrot.
~~~Mark Twain~~~

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