Thanks Mark for the long and very useful answer!
I think i have solved (kind of) the puzzle:
Got my Quatech SSP-100 PCMCIA Card recognised with PCMCIA Socket Services 8.0.
PCMCIA Controller Driver, which i succesflully used is
Intel SS2PCIC.SYS commercial Driver
APSoft SSPCIC.SYS also recognizes my PCMCIA Controller Ricoh R5C476 II but i got it not working with it.
The magic tric was in this line:
BASEDEV=PCMCIA.SYS /V /R:500While the ArcaOS Socket Services 5.0 need the
/R:500 to operate in the 5.0 Version of socket Services (Default one is 2.0)
in the newer IBM Socket Services 8.0 this switch should be removed.
After i removed /R:500 swithch, i got the message, that the Card Services Version are 8.0 and suddenly the SSP-100 was recognized as a Modem (COM1), got Power and seems to work.
Will attach some screenshots tomorrow...
Thanks for all the answers, comments and advises! Happy new year!
PS: Sorry, I dont find yet an Screenshot tool for ArcaOS, so i made some pictures:
Hardware Manager, PCIINFO and Card Services.
The most curious thing that i found out (might be also useful for another Ricoh R5C476II CardBus enabled Notebooks (Like ThinkPads X2x, X4x, A30):
Later ThinkPads (like X3x, X4x, X6x, T4x) have later Ricoh Cardbus Controller, which also emulates R5C476II.
The PCMCIA Serial Card is only enabled and got Power, when an FAT-formatted SD-Card is in the SD-Card slot !
The sound absolutely unbelievable, but when i boot without SD-card in the slot - the PCMCIA Card didn't get power and is not recognized at all.Here are relevant parts of my CONFIG.SYS:
REM *** PCCARD 8 ***
BASEDEV=PCMCIA.SYS /V
BASEDEV=SS2PCIC1.SYS /E
REM BASEDEV=SSPCIC.SYS /E /AP:ON /BE:AUTO /VS:AUTO /II:OFF /IN:ON
BASEDEV=AUTODRV2.SYS
BASEDEV=PCM2ATA.ADD /S:2 /!DM /NOBEEP
BASEDEV=OS2PCARD.DMD
DEVICE=D:\PCCARD\VPCMCIA.SYS
DEVICE=D:\PCCARD\PCMSSDIF.SYS
DEVICE=D:\PCCARD\PCM2SRAM.SYS
DEVICE=D:\PCCARD\FLSH2MTD.SYS
DEVICE=D:\PCCARD\PCM2FLSH.SYS
REM *** QUATECH SSP-100 PCMCIA RS232 ***
REM DEVICE=D:\OS2\BOOT\QCOM.SYS (1,2F8,3) /L
REM DEVICE=D:\OS2\BOOT\QVCOM.SYS (1,2F8,3)
DEVICE=D:\OS2\BOOT\SSP100.SYS COM1
REM *** SERIAL COM PORT DRIVERS ***
REM DEVICE=D:\OS2\BOOT\COM.SYS (2,3F8,4)
DEVICE=D:\OS2\BOOT\PSCOM.SYS (2,3F8,4)
DEVICE=D:\OS2\MDOS\VCOM.SYS (2,3F8,4)
Quatech QCOM and QVCOM Drivers did not find UART and i have disabled them. For now i use PSCOM and VCOM.
PSCOM need to be set to COM2 (2, 3F8, 4), otherwise SSP100.SYS cant use COM1. A bit strange, but for now it works.
I am happy, that the whole story somehow find an happy end. Learned a lot....

Happy new year to all!!