Thanks a lot for your reply! 😀
vladstamate wrote:[
Jo22 wrote:
And if so, could it be used as a tone generator ?
I do not believe the frequency is high enough to do anything. Plus the timer chip in the XT and AT already do that. They are connected to the speaker and generate proper frequencies. What do you think the RTC can do more?
Well, I thought that RTC chip was a general-purpose clock module. Something that was used to build alarm clocks, too.
So I hoped that module was able to produce audible tones, just like an ordinary alarm clock or wristwatch would be able to.
All in all, this would have been interesting to experiment with. Even though if the PC speaker had been on par with that
tone generator or if it had been better, it would have had provided another audio channel. That's why I asked.
By the way, speaking of the PC speaker or more precisely, the i8253 PIT:
Do you know of other computer platforms that used it as a tone generator ? 😕
I mean, platforms that made full use of it as a tone generator ?
From what I read, the PC speaker gets only one counter (counter 2 ?) for producing sounds.
The reason I ask, is, because I love chip tunes of all sorts, including simple tone generators (incl. 555 based ones)
and because I grew up with the Sharp MZ series, which included an i8253 "PC speaker", too. 😊
Speaking of the Sharp MZ line, it seemed to have had more channels/counters dedicated to the speaker.
Please excuse my imprecise wording.. What I mean is the type of sound effect like used in DEFENDER.
I made a recording (bad, since the emulator is DOS based and uses speaker-passthrough) here.
The sound effects of the "attack wave completed" screen sounds not like a typical IBM PC-Speaker SFX.
Edit: Just made a new video. It shows the game running on a good MZ-800 emulator, with better sound support.
It's available here: https://youtu.be/ZrNZ7-jV8p4?t=100
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