[cctalk] Re: Replacements for DEC 3639

Schotky diode the keep the base out of saturation ? As used in 74S 74LS, appreciate it's an extra component to bodge in see eg https://electronics.stackexchange.com/questions/242715/using-a-schottky-dio… Martin -----Original Message----- From: Christian Corti via cctalk <cctalk(a)classiccmp.org> Sent: 28 October 2025 08:30 To: Jon Elson via cctalk <cctalk(a)classiccmp.org> Cc: Christian Corti <cc(a)informatik.uni-stuttgart.de> Subject: [cctalk] Re: Replacements for DEC 3639 On Mon, 27 Oct 2025, Jon Elson wrote: Rise/fall times are not the problem. The problem is the huge delay of over 100ns due to the storage time. Christian