Timeline for Is it possible to just construct a simple cable serial↔︎serial and send data from PC to C64?
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| Dec 2, 2020 at 21:11 | comment | added | Solomon Slow | @ilkkachu I think the answer is, "none." But, I'm also pretty sure that FTDI put "TTL" in the names of their products to emphasize that they are TTL compatible. Data sheets are available, but I'm not expert enough to find actual proof of TTL compatibility in them. | |
| Dec 2, 2020 at 20:25 | comment | added | ilkkachu | @fluffysheap, I wonder how many of those TTL-level adapters really have TTL inputs and outputs, and not just something that uses those voltage levels but is actually more like CMOS with regard to current sourcing. | |
| Dec 2, 2020 at 15:59 | comment | added | Solomon Slow | And, in case anybody here doesn't already know, FTDI also makes a 3.3V adapter: TTL-232R-3V3. But beware! The "V+" output from the "3.3V" FTDI adapter is 5V. Only the signals are 3.3V. | |
| Dec 2, 2020 at 0:37 | comment | added | fluffysheap | A lot of today's devices with "serial" ports actually use +5/+0 levels instead of +/- 12. Many use +3.3/+0 which is potentially just as good, because a TTL high is really about +3.3 volts (sometimes as low as +2.5) even though it's nominally +5; meanwhile the modern CMOS at 3.3V will drive the signal to full +3.3, which is compatible with the TTL input. In a product to sell, this is no good; if your goal is to wire something up in your basement, you may get away with things like this. Make sure the CMOS output can sink enough current (TTL inputs source current). Get out your voltmeter! | |
| Dec 1, 2020 at 16:11 | comment | added | Solomon Slow | Re: "+5/0", That sounds compatible with a "TTL-232R-5V" USB<=>async serial adaptor from FTDI. Google "TTL-232R-5V" to find sources: | |
| Dec 1, 2020 at 12:16 | comment | added | Chris H | If you're using a modern PC with a USB-serial converter, that may already be 5/0V | |
| Dec 1, 2020 at 9:49 | comment | added | Rodney | RS232 to TTL (5V) level converter boards used to be very cheap and readily available (not so sure if that's still the case as these days people usually access TTL serial ports using a USB-based adaptor as per Colin's answer). | |
| Nov 30, 2020 at 23:04 | history | edited | user6576 | CC BY-SA 4.0 |
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| Nov 30, 2020 at 22:55 | history | edited | user6576 | CC BY-SA 4.0 |
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| Nov 30, 2020 at 22:39 | history | edited | user6576 | CC BY-SA 4.0 |
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| Nov 30, 2020 at 22:31 | history | answered | user6576 | CC BY-SA 4.0 |