Is there any documentation on CLKDVR.SYS? According to Wikipedia, for a real-time clock to work the jumper J13 must be closed.

https://en.wikipedia.org/wiki/Leading_Edge_Mo … Modern_Upgrades

I set my XT-IDE to 340h, and my Intel 8/16 NIC to 260h, so they don't conflict with the clock on IO 300h. The Leading Edge diagnostic utility shows the clock as enabled. The clock seems to work fine (keeps the time, day, and month when the PC is shut off), it just always thinks it's 1980.

Perhaps CLKDVR.SYS have some parameters that must be set. Also found this

https://stason.org/TULARC/pc/motherboards/L/L … REVISION-1.html

Maybe, but I haven't seen any reference to any options for it.

Leading Edge Model D Operator's Guide 😀

https://archive.org/details/leadingedge_model … e4thed_d3187910

The Leading Edge diagnostic and master disk (DOS 3.1 and DOS 2.1) see the year correctly, so this seems to be a DOS problem. 1980 is the DOS default year. I guess CLKDVR.SYS doesn't set the year correctly on DOS 6.22.

Why, I don't know. The KnowledgeBase article says it's supposed to work.

Checkit! v3 has a clock test functionality. It'll test both DOS clock and hardware clock.
Not sure how many different RTCs it does support, though. 🤷‍♂️

Edit: The problem might be related to how DOS handles the RTC or how it updates things (all digits or just two for the year).
If I remember correctly, DOS didn't support RTCs before PC DOS 3.0 or similar.
The IBM AT RTC and compatible RTCs are supported, not sure about XT era RTCs.

Edit: IBM "supported" non-IBM PCs with DOS 3.30 first time.

Edit: The RTC could be an MM58167 (also used by AST SixPackPlus?)
Some drivers are available here: https://www.minuszerodegrees.net/rtc/rtc.htm

Oh, maybe the TSR hands DOS 6.22 a two-digit year, but DOS now wants a four-digit year. The TSR is only 735 bytes. It would probably be trivial to decompile and change for someone other than me.

Checkit 3.0 doesn't see it (maybe because of the non-standard IO port). DIAGNOSE.EXE from Leading Edge sees it.

I'll look for other drivers on that page. I see that CLKDVR.SYS is not listed. The 6PakPlus driver may work if I can change the base port.

Obviously leading edge has decided that the 80s are the best.

looking at the datasheet for the mm58167B... How/where does that chip stores the information for which year it is ? 🤨

awgamer wrote on 2023-08-21, 12:36:

Obviously leading edge has decided that the 80s are the best.

i was thinking that too 😀