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lyonadmiral
June 21st, 2016, 10:06 AM
I was just reading Minus Zero's page on adding this neat RTC to a 5155/5160. Is there no way to do this on a 5150?

Thanks,
Daniel

Chuck(G)
June 21st, 2016, 12:30 PM
Yes, but note that it will take a different adapter--the one shown on MZD is for a 28 pin PROM. The 5150 uses 24 pin ones. The DS1216 was offered in 24-pin configurations for both the 5150 and the Apple II, but they're pretty rare now. You could always make your own.

lyonadmiral
June 22nd, 2016, 06:48 PM
Yes, but note that it will take a different adapter--the one shown on MZD is for a 28 pin PROM. The 5150 uses 24 pin ones. The DS1216 was offered in 24-pin configurations for both the 5150 and the Apple II, but they're pretty rare now. You could always make your own.

I'm up for that if I can find some "destructions".

modem7
June 23rd, 2016, 11:26 PM
I did a quick test using items that I already had.

The combination of stacked items pictured at [here (http://www.minuszerodegrees.net/temp/3/ds97546521570.jpg)] works, if that combination is inserted into socket U33 in place of the BIOS ROM there, and the CLOCK.EXE (within ds1216e.zip) from Mike Brutman's web site is used.

However, the tallness of the stack means that it cannot be fitted to the motherboard if either:
* the IBM 5150 is fitted with a drive in its left drive bay; or
* the IBM 5150 has a medium to long card in slot 5.

Unfortunately, the above quoted CLOCK.EXE does not work with the adapter/DS1216E fitted to any other ROM socket (U28/U29/U30/U31/U32). For another socket, a modified CLOCK.EXE is probably required.

lyonadmiral
June 24th, 2016, 06:01 AM
However, the tallness of the stack means that it cannot be fitted to the motherboard if either:
* the IBM 5150 is fitted with a drive in its left drive bay; or
* the IBM 5150 has a medium to long card in slot 5.

Guess that is out, because both drives are installed.

Chuck(G)
June 24th, 2016, 06:33 AM
The reason you don't see many "invisible clock" setups on 5150s probably is the result of needing an extra board to bring the memory up to 512/640KB. Such boards are usually multifunction--and that includes a clock chip.