30 Nov
2025
30 Nov
'25
11:53 a.m.
On Mon, Nov 17, 2025 at 12:51 AM Rob Jarratt via cctalk
<cctalk(a)classiccmp.org> wrote:
I have a VT100 that I was working on a while back and
then set aside for a
bit. I have started to look at it again. I have noticed that the Video Shift
Register, a 74S299, gets very hot, I can smell the heat and the chip gets
almost too hot to touch, reaching almost 40 celsius.
What if you tried replacing it with a 74F299?
Ought to be like half the power dissipation and at least as fast.
Unless the sharper edges cause issues.