Sergey Kiselev
Sergey Kiselev
I'll try to reproduce it on my end.
@640-KB thank you for sharing the information about PC DOS 7. I don't personally use it, so I wasn't aware about it. New thing learned 😉 @ConiKost presumably, the INT...
It is not a BIOS bug, it is a PC DOS 7 bug. Potential workaround - use [DSCLOCK.SYS driver](https://github.com/skiselev/RTC8088/tree/main/software) instead of BIOS clock routines.
First of all, I contacted TexElec, and asked them to test 2.7 on their hardware (not that I except any unusual behavior, but it wouldn't hurt to do more testing)....
I tested the option 1 above on my IBM XT system, and it worked perfectly. Note that in my case the Multi-Floppy BIOS Extension ROM is at 0xC8000 
The project is not complete yet. Anyone wants to help with the PCB layout? 😄
Thank you for the information. Shan Zhongyu, the actual author/designer of Book 8088 and related systems, contacted me back in December last year, so I kind of knew that this...
It's a good question. I personally don't like the idea of autodetecting the RTC or anything else on the ISA bus. The ISA bus does not provide a reliable mechanism...
I believe this issue has been addressed here https://github.com/spark2k06/RTC8088/issues/9