It loads through until it reaches doscall1.DLL then crashes. Yes
Ah, if you're using the WinWorld images, I noticed a lot of them seem to be buggy except for a few (this is due to corrupted virtual floppy images in the ISO). Give this one a shot if you haven't:
IBM OS2 Warp 4.52 Server For e-Business (4.52.14.089_UNI)
I was getting the 'doscall1' error on fully supported hardware, I switched to the 'IBM OS2 Warp 4.52 (4.52.14.086_W4)' image and it installed without issue.
Although the T61 is technically not supported, but I am curious to see (once you've confirmed you're using a good image) if it actually runs.