VOGONS


First post, by ibm5155

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It's been a while since I got this laptop and I will say a resume on why I am in love with i:

- 3 PCMCIA slots (not 1 nor 2, 3!)
- Can boot from pcmcia cards.
- comes with an external Floppy Disk drive plugged to the Parallel Port.
- ESS ES1879 audio chip (FM Synth, good support for MS-DOS, has VxD and WDM drivers)
- CT65555 GPU
- 1 USB 1.1
- Most games works in FullScreen (using all the areas from the Screen instead of leaving some unused space on the screen)
- Quite compact (8 Inches I believe but bigger than Libretto)
- Pentium MMX 233MHz (there's a version with 260MHz)
- Ram can be expanded up to 192MB or 128MB if I recall (mine has 96MB)
- Comes with camera batteries (with that said you can find new batteries for it)
- External CMOS Battery
- You can open the bios while the OS is running without any additional software (also there're some bundled tools that work the same way where they show you the remaining battery or the performance level).
- You can underclock it on the fly
- TFT screen 800x600

But not everything is perfect:

- Japanese Keyboard (Usable but I'm not sure how to use the windows key since the keyboard doesn't have one)
- No Cooler (it seems to run ok without one but it surely gets warmer compared to a Toshiba Satellite 330CDT so an external cooler base is ideal if used for games)
- If you plan to replace the Hard Disk you'll need to remove the entire motherboard .
- Japanese BIOS
- Comes with DOS/V (So compatibility with MS-DOS games may not be the best)

Scores on Speed sys (Maximum performance | speedsys score)
12% | 20.96 ( similar to a Intel i486DX2 25MHz)
25% | 42.32
45% | 63.81
50% | 86.22
75% | 128.11
85% | 149.56
100%|171.51

Quake 2 demo1.dm2 at 320x200 ( 17FPS, 15 with the WDM Audio driver)

About the IO:
- Serial, Parallel Port, VGA, Audio In/Out, USB, Infrared, 3 PCMCIA slots, 1 PS2 port for mouse/keyboard

I'd say it's a great laptop if your goal is to play old games and not use a lot of space, I am still testing it so please let me know if you want to know if any specific game will run on it.

Last edited by ibm5155 on 2022-10-01, 12:06. Edited 2 times in total.

Reply 1 of 9, by ibm5155

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Pictures/Videos

Items/Laptop

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Teardown/Inside

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Games

https://www.youtube.com/embed/Wi_2KY0QWUU

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Overclock

Overclocking IBM Thinkpad 235 (at your own risk)
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source: http://tori0125.livedoor.blog/archives/347413.html

Last edited by ibm5155 on 2023-03-15, 10:31. Edited 2 times in total.

Reply 3 of 9, by ibm5155

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ThinkpadIL wrote on 2022-10-01, 08:46:
ibm5155 wrote on 2022-10-01, 07:28:

- comes with an external Floppy Disk drive plugged to the SCSI port.

It's not a SCSI, but a Parallel Port.

Indeed, ty for pointing out.

Reply 4 of 9, by ibm5155

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I Accidentally plugged a 20v AC on it and it stopped working, luckily, only a fuse went bad, glad the board has a description on the type of the fuse (FO 32v 2.5A). doing direct contact on the fuse made machine to boot so now it's just a mater of trying to find a new fuse.

By the way, I managed to get the laptop to work with a USBC charger, despite the laptop saying it's 16V it seems to be doing fine with 15V (14.80)

Working with USB C

b561sFr.png

the cable is the following one: https://www.amazon.co.jp/gp/product/B096M3RB6Q
PDE-15V-5525

I tried this one https://www.amazon.co.jp/gp/product/B0B34RRLWK but it toasted the fuse by supplying 20v, I should have bought the other cable instead of this one haha

Reply 6 of 9, by ibm5155

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ediflorianUS wrote on 2023-03-16, 13:38:

I did the same thing with this :

I could never fix it.... (lack of knowledge to find fault).

I suspected it was something simple since the laptop was working with battery despite not working on AC and i found out the battery circuit is connected to the AC one, a multimeter deffo would help to test if the fuse was bad haha but I am in another country without any multimeter here.

Reply 7 of 9, by OldWingCommander

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Hi @ibm5155. I just got one of these. Can you describe to me the steps you took to get to the hard drive?

I don't want to break anything along the way so any advice and steps you can give would be much appreciated!

Reply 8 of 9, by ibm5155

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OldWingCommander wrote on 2023-06-17, 17:06:

Hi @ibm5155. I just got one of these. Can you describe to me the steps you took to get to the hard drive?

I don't want to break anything along the way so any advice and steps you can give would be much appreciated!

Replacing the hard drive will be tricky since it's on the opposite side of the motherboard, you'll have to completely disassemble it in order to get access to the hard disk.

Here is an tutorial: http://www.sanda.gr.jp/non/TP235/

I'd say the worst parts for me were removing the pcmcia slots and also the power button

Reply 9 of 9, by ibm5155

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Great news, I managed to fix my IBM!

Al I had to do was to replace the fuse by this one 32V 2.5a

So now that this setup is properly working with USBC Her are some numbers:

- CPU from 12% power to 100% (233MHz) has a 5 Watts increase.
- Total System Power is 18 Watts.
- Charging both batteries adds 6 Watts.
- using an external CDROM player and playing a CD adds another 10 Watts.
- PCMCIA CF to MicroSD adds 2 Watts.

I'd say when charging and playing a cd it'll consume near 30 Watts so a 45 Watts 15V USBC charger offering 3 amps should be plenty enough for it