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Users browsing this forum: Google [Bot] and 0 guests. Tue Dec 11, 8: It’s generally two to the power of however many register-select inputs there are. Since the PIA has two and I think the is the same thingthat makes for four addresses. That doesn’t mean you have to give it only four addresses. You can give it a lot more to make your address decoding hardware simpler and just not use more than four.

74HCT640 SOP20

If you do give it more, the four you need will get reflected in other addresses; but if you don’t use them, it does not cause any problems. What type of chip would be good for an FDC.

I found a datasheet at http: The idea for use like on a parallel printer, where you write to the port for example, one line tells the printer, “I have new data for you,” and the printer takes it and uses the other line to say, “Thanks. I’m ready for another byte. Datahseet have these also, and I have only used them for other things. Tue Dec 31, 2: Sacramento, CA, United States.


So going off this example: Here’s what I get from page 10 of the http: Bit 0 ie, the bit whose value is 1, the number you put in your first line has to do with enabling interrupts caused by an active edge on CA1; so that’s not what you want right now.

Actually though, unless you know for sure that all the other bits in CRA are 0 and you want to keep them that way, it would be better to use an instruction or sequence of instructions that sets only that bit and leaves the rest unaffected.

Mon Dec datssheet, 2: Page 2 of 2. Previous topic Next topic. Sat Aug 03, Thanks for looking that up for me, Garth. I remember that the little proto-board project that I did with the about 27 years ago!

You won’t find that on a data sheet! I dug it out and had my co-worker take a picture of its long-dead corpse. JPG You do not have the required permissions to view the files attached to this post. Tue Jan 15, 5: Cool — so you have d0 on one IC connected to d7 on the other, d1 to d6and datqsheet on? I like how you fixed it in software!


Specs Texas Instruments 74HCT – IC-SCHALTUNG Not Categorized (CD74HCTE)

An alternative solution — besides a jumble of jumpers on top of jumpers 74gct640 would be to 74htc640 the pinout by turning the chip upside down, and then bending the pins around or soldering to some sort of adapter. Offhand, I’d say you made the right choice!

Speaking of vagaries of VIA usage, this computer my KimKlone has opcodes that talk to one of a VIA’s bit counters, rendering it part of the programming model. Moreover, I needed the counter to increment, not decrement– again, something you won’t find on the data sheet! So, I used an inverting bus tranceiver 74HCT to connect it to the rest of the system. You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot post attachments in this forum.