3 ms·
> The CPU has no crystal to provide clocking, instead DEC used a delay line in a feedback loop. Were oscillators back then expensive, unreliable, or it's anoth
by hcarvalhoalves 12y ago
> The CPU has no crystal to provide clocking, instead DEC used a delay line in a feedback loop.
Were oscillators back then expensive, unreliable, or it's another reason for not using one?
- VLM 12y agoNo, but fooling around with the delay line is one way to implement single-step or really slow step. So either your next clock pulse is when a humanoid hits a button or when a delay line times out. Can't just gate in a clock using a "AND" because of jitter and syncing is more trouble than its worth. I never worked on this model so this is just semi-educated guess.