Boot and X problems resolved!
many many thanks for your suggestions.
Finally it was the right thing to get a precompiled
kernel and boot this one with BootX. The system came
up again without problems.
I couldn't hesitate to try this kernel compiling again.
This time I made the "make modules" and "make modules_install"
immediately after "make vmlinux". And again, no problem booting
my newly compiled kernel. And even more: with the new kernel my
X colormaps are now correctly interpreted and the mouse is
working fine too :-)
PS: Debian is running on a Apple Macintosh G3/233MHz with 160MB RAM,
4.3 GB IDE harddrive and 4 MB VRAM
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