So, in many cases, the Mac is not an option without a VM. For certain pro software, you buy the machine that runs the software, no the other way round.
Macspice add third party library serial#
Separately, a small CPU is needed to do the serial port stuff for the signal. The whole thing needs 250mA at 4.5V, which can be taken from a USB port.
A 3.3V linear regulator then provides the sustain current to keep the magnet pulled in after the cap dumps. The 120VDC is only needed for the first 1ms or so of each bit time, to push current through the big inductance. But I've designed something that up-converts 4.5VDC to 120VDC using an IC intended for photoflash applications, charges up a capacitor when the input is low, and when the input transitions to high (MARK), dumps the energy into the magnet. Most of the energy is wasted heating up the big resistor. The usual power supply for the 60mA current loop required is a 120VDC supply through a 2K 10W resistor, to get enough punch to energize the 4H 55 ohm selector magnet of the Teletype fast enough. As an exercise, I've been designing hardware to run a Model 15 Teletype (1930s technology) from a USB port. You'll probably have to put together a model library for your students, from various downloaded models. Some additional libraries for other purposes. The component library has just about everything Linear makes, and not much else. LTSpice is quite good if you want to design power supplies with Linear Technology components.
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