Timeline for How is the Apple II text flash mode timed?
Current License: CC BY-SA 4.0
15 events
| when toggle format | what | by | license | comment | |
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| Jul 16 at 23:03 | comment | added | Raffzahn | @MicahCowan Nice find. Unnoticed for 4+ years :) (P.S.: anything past second magnitude is pointless for this setup). | |
| Jul 16 at 23:02 | history | edited | Raffzahn | CC BY-SA 4.0 |
Seconds -> Hz, Thx Micah
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| Jul 16 at 20:58 | comment | added | Micah Cowan | This is a hugely helpful answer... but a key part of it seems to be incorrect. When I plug those values into the provided online 555 calculator, I get a frequency of 2.182 Hertz (period/"cycle time" of ~230ms), not a "cycle time" of 2.1 seconds. That value couldn't be correct anyway, as anyone who's sat in front of a real Apple II has experienced a much faster blink than "on for one second, off for one second". 2.1 hertz means in (a hair less than) one second you'll get "on off on off". Two complete cycles. So you should expect the flash state to change every quarter-second. | |
| Jun 10 at 17:14 | vote | accept | bjb | ||
| Feb 28, 2020 at 0:13 | comment | added | supercat | @bjb: The hardware flashing feature is only available for the 64 character glyphs on the uppercase-only Apple II+. The //e added lowercase letters, but those characters don't support hardware flashing. | |
| Feb 27, 2020 at 23:39 | comment | added | bjb | Clarified the question. However, it sounds like from this thread that the CURSOR flash is hardware controlled on the II/II+ and software controlled on the rest. | |
| Feb 27, 2020 at 20:25 | comment | added | Greg Hewgill | On my Apple II+, the 555 or the cap died and I was left with no cursor at all. As a stopgap measure, I pulled the 555 and replaced it with a wire between I guess pins 1 and 3. That gave me an inverse cursor which made the machine usable again. | |
| Feb 27, 2020 at 18:55 | comment | added | Raffzahn | In my opinion 'hardware controlled' would imply there is some control to be asserted, like the ability to change it from software. Wouldn't it? | |
| Feb 27, 2020 at 16:50 | comment | added | supercat | Instead of saying "Fixed", I'd say "hardware-controlled" since, as you later note, the time is variable depending upon temperature, phase of the moon, etc. | |
| Feb 27, 2020 at 15:52 | comment | added | Raffzahn | Could be either, I guess I'll have to wait for the OP to clarify. | |
| Feb 27, 2020 at 15:51 | history | edited | Raffzahn | CC BY-SA 4.0 |
added 521 characters in body
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| Feb 27, 2020 at 15:46 | comment | added | Tommy | I read it as "why was the cursor changed from a flashing square, if colour inversion was still available?" So possibly it's more a follow-on query about the way in which the character set was expanded in the IIe and IIc? | |
| Feb 27, 2020 at 15:27 | comment | added | Omar and Lorraine | I think he means, "why is the cursor affected but not the text display?" | |
| Feb 27, 2020 at 15:12 | history | edited | Raffzahn | CC BY-SA 4.0 |
added 308 characters in body
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| Feb 27, 2020 at 14:46 | history | answered | Raffzahn | CC BY-SA 4.0 |