However the latest driver version for Windows 7 (also operates on XP and Vista) provides a chance to configure a suitable workaround. Please download the latest manual to see how this can be used.

Very frequently Windows programs refuse to operate with COM10 or higher. What is the reason?

1. The program is an old 16-bit application. In this case COM9 is the highest available interface.
   It is very likely this is not the cause today, but you never know.
2. The program offers a list of ports, only containing COM1 through COM9.
   Please contact the programmer. This is a limit imposed by his application.
3. The program does not open the port in the correct way, please contact the programmer.
   Probably a name like "COM11:" is used to select the port. This is not allowed. The correct name is "\\.\COM11", i.e. with <Backslash><Backslash><Dot><Backslash> as prefix; further the colon at the end is not allowed. This method also operates with COM1 through COM9.

Programmers shall check the MSDN article about this problem.

1. put register address on the wire

2. put/read data to/from register

That is the reason, why standard LinCan  driver is not working as is. Following changes have to be made to make the driver working. 

Introduce such a global variable:
can_ioptr_t base_addr;
in gensja1000io_init_chip_data() base_addr should the value of chip_base_addr.

So write routine in gensja1000io.c would look like this:

gensja1000io_write_register( data, address)
{
can_outb(address - base_addr, base_addr); // calculate register offset
can_outb(data, base_addr + 1);
}
Read routine would look like this:
gensja1000io_read_register( address)
{
can_outb(address - base_addr, base_addr); // calculate register offset
can_inb(data, base_addr + 1);
}

CAN reset is to be handled the same way. 

Here is a list of the newer cards:

PCI: 200I(-SI), 400I, 800I

PCI Express: 200E, 400E, 800E, 200EI(-SI), 400EH, 800EH

The link to the patch: http://kerneltrap.org/mailarchive/git-commits-head/2010/6/4/41231

Detailed answer: There is a small EEPROM (2 kbit or less) embedded. This is used for configuration in the production.
The content can be changed by special software, but only changes items like serial number. This is not much of useful information.