I recently got a Schneider EURO PC I with a battery damage. The PC complained about the missing RTC, was not displaying anything on the internal Video and a external VGA was also not initialized.

I was able to fix a trace to the PVC4 and the Video is working again. But the traces to the RTC are too small and there is too much damage. Without RTC I was not able to enter the BIOS-Setup and configure the PC to boot from VGA.

Therefore I modified the BIOS...:
- no checksum
- no wait for keypress on error
- RTC data hardwired in BIOS image. Needs to be entered at offset 6F8A - 6F99, after the "XXXXX", 16 Bytes
- XT-IDE included

With this I am able to configure the PC without RTC. A damaged PVC4 should also be no Problem when you use an external graphics card. Therefore most battery damages on the board are no problem anymore. All traces below the battery belong to the RTC or the PVC4.

The configuration data can be taken from a working PC oder from PCem. The attahced EURORTC.COM reads the data from the CMOS. Only one byte (the lower from the displayed) needs to be entered in the ROM-image. Its preconfigured for 9.77 MHz and start with external VGA now. Therefore for most people there should be no need to change it.

Let me know if its useful for your or if you still have trouble with a beeping and not starting EURO-PC 😉

Byte A: RAM
08 512 kB
00 640 kB

Byte B: Internal Video
12 Color
03 Mono
10 default

Byte D: CPU Speed
18 4.77 MHz
50 7.15 MHz
90 9.54 MHz