I am currently working on an IBM 5100 that has some issues. I know for
certain that the 5100 has a bad graphics controller card so I need to dig
into component level replacements for those ICs I can replace. I have a
list of logic chip equivalents to the IBM part numbers that are written on
the chi
My reliable list says your cheap logic tester is right 1582601 = 74157
Paul.
On 2021-06-11 5:22 p.m., Santo Nucifora via cctalk wrote:
I am currently working on an IBM 5100 that has some issues. I know for
certain that the 5100 has a bad graphics controller card so I need to dig
into component
Thank you for the quick reply. As soon as you wrote that, I checked my
list again and I have two entries for 74151. The other is 2392121 which I
assume is the right one?
Would you mind sharing your list? I can cross-reference and see how
accurate mine is.
Thanks again,
Santo
On Fri, Jun 11, 2
On 6/11/21 3:22 PM, Santo Nucifora via cctalk wrote:
The 74151 is an 8:1 multiplexer with complementary outputs.
The 74157 is a quad 2:1 mux.
I can't imagine any defect that would cause one to test out
as the other.
Jon
Hi!
Dragged out my old Compaq DAT tape drive and although it powers up some
of the rubber wheels have turned to goo. Since I don't have any reason
to fix it I thought I'd offer it here for shipping. Compaq 3000 series,
this is a 199527-003, rebadged HP tape changer.
It got a 10 tape capacity
On Sat, Jun 12, 2021 at 12:39 AM Jon Elson via cctalk
wrote:
>
> On 6/11/21 3:22 PM, Santo Nucifora via cctalk wrote:
>
> The 74151 is an 8:1 multiplexer with complementary outputs.
>
> The 74157 is a quad 2:1 mux.
>
> I can't imagine any defect that would cause one to test out
> as the other.
In
On Sat, 12 Jun 2021, Tony Duell via cctalk wrote:
In both cases it would require an input pin to become an output,
something that I can't see how it would happen.
I wonder if in the original list, a '1' was misread as a '7' or vice
versa. I am told that in some countries the '7' is conventionall
