WTD 8087 (FPU), and XT RTC

[silcreval]

Hi

Looking for some upgrades for an IBM XT.

An 8087 (DIL) FPU chip, and a real time clock would
be top of the list. I'm also looking for memory cards,
and accelerators if anyone has anything.

Thanks.

[Terry Yager]

The XT doesn't have it's own RTC. Are you looking for one of the third-party slotless type that fits under a ROM chip?

--T

[silcreval]

Is it possible to get an RTC on an 8 bit card? The ROM
modification sounds interesting although.

[billdeg]

I pulled a 8-bit RTC card from a computer recently.
http://vintagecomputer.net/itemsavailable/isa_clock-card_bad-batt.jpg

[per]

Is it possible to get an RTC on an 8 bit card? The ROM
modification sounds interesting although.

Some cards, like the AST SixPakPlus (http://oldibmpc.sitesled.com/8AST.htm#multi1), got a battery backed-up clock. However, you'll need a driver to use it.

[Terry Yager]

The clock chips used to be pretty common. Don't know the chances of finding one today.

--T

[MikeS]

I wouldn't think they're *that* rare; what might be more difficult is finding the driver/set program.

As mentioned there were single-chip versions that fit under a ROM chip and single-purpose cards like the one Bill shows, but most clones had them on the multi-I/O or memory expansion cards; I've got cards and I've got drivers, but it'll be a PITA to try to match them up...

There might still be an old XT somewhere in the pile with the board and driver still in it and also a NIB multi-I/O card or two somewhere; I'll look around.