Two entries:
In December 2018 I heard from Michal who had added a second IDE port to his V10L:
Out of curiosity I soldered a second header into the board and it turned out to work flawlessly. Simple mod, although requires cleaning soldered pinholes and so it's not an easy task.
A view of the circuit board showing the location of the extra IDE connector. In this example it is partially covered by the 'MAC ID' label.
A view of Michal's modified board. At the right-hand end is the standard DOM fitted to its connector. At the left-hand end you can see the new connector that Michal has added.
The BIOS display with another SSD plugged into the new connector.
If you are using a standard off-the-shelf OS and connecting your storage device to the IDE interface either directly or by using a short 40-way cable you may find that the IDE ports only work in ATA 33 mode. On desktop computers you need an 80 wire IDE cable to enable the ATA 66/100/133 modes. The 80-way cables signal their presence by connecting pin 34 on the IDE interface to ground. So, to get the faster modes, I added a wire strap to the board.
With this in place HD Tune showed a sequential read rate of 45MB/s.
[David: You will need to add the strap for Windows 98 or XP. However Linux has a convenient command
line switch to say "assume it's a short cable so you can use the higher rates":
libata.force=short40c
]