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 8 bit counter for breadboard computer 
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Joined: Fri Mar 22, 2019 8:03 am
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Location: Girona-Catalonia
prpplague wrote:
joanlluch wrote:
Hi prpplague,

Thank you very much for your info and pointers. That's exactly what I needed to know.


glad to help when i can! let me know how it works out for you! try documenting your project at hackaday.io !

Dave

Hi Dave,
Actually, I have already thread on the "projects" section about something I'm currently at: http://anycpu.org/forum/viewtopic.php?f=23&t=583&start=75 I'm documenting it all here, but I may post something in hackaday,io too as soon as I have photos to show.

I have already made my first steps with the wincpul tool and at first glance it looks easy enough. But I have difficulties at finding the ATF16V8 or equivalent on Eagle CAD. I want to design a PCB for it, but I got stuck because I can't find the part in the library. Any ideas?

Thanks.


Fri Apr 26, 2019 6:33 pm
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Joined: Thu Apr 04, 2019 6:20 pm
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joanlluch wrote:
prpplague wrote:
joanlluch wrote:
Hi prpplague,

Thank you very much for your info and pointers. That's exactly what I needed to know.


glad to help when i can! let me know how it works out for you! try documenting your project at hackaday.io !

Dave

Hi Dave,
Actually, I have already thread on the "projects" section about something I'm currently at: http://anycpu.org/forum/viewtopic.php?f=23&t=583&start=75 I'm documenting it all here, but I may post something in hackaday,io too as soon as I have photos to show.

I have already made my first steps with the wincpul tool and at first glance it looks easy enough. But I have difficulties at finding the ATF16V8 or equivalent on Eagle CAD. I want to design a PCB for it, but I got stuck because I can't find the part in the library. Any ideas?

Thanks.


i created an eagle symbol and footprint for my hex decoder project - https://hackaday.io/project/163274-4-bi ... ex-decoder

i've add the 16v8.lbr to the files on that page. you can download it from there!


Fri Apr 26, 2019 7:06 pm
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Joined: Fri Aug 01, 2014 3:00 pm
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Next question is could you squeeze 2 or even 4 one byte flip flops into one chip? Basically a register file with W/R, OE and 1-2 bits of address.


Fri Apr 26, 2019 7:21 pm
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Druzyek wrote:
Next question is could you squeeze 2 or even 4 one byte flip flops into one chip? Basically a register file with W/R, OE and 1-2 bits of address.


i don't have a good answer for you... but based on my experience, it seems very possible...


Fri Apr 26, 2019 7:39 pm
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prpplague wrote:
Druzyek wrote:
Next question is could you squeeze 2 or even 4 one byte flip flops into one chip? Basically a register file with W/R, OE and 1-2 bits of address.


i don't have a good answer for you... but based on my experience, it seems very possible...


i did a quick test on my bench and it seems completely doable....


Fri Apr 26, 2019 8:25 pm
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Location: Canada
Quote:
Next question is could you squeeze 2 or even 4 one byte flip flops into one chip? Basically a register file with W/R, OE and 1-2 bits of address.

Sounds like 74LS670 register file might be handy. IIRC it has four registers with separate read/write address and data. (Something newer than LS might be desirable (eg.74HCT670)).

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Fri Apr 26, 2019 9:01 pm
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robfinch wrote:
Quote:
Next question is could you squeeze 2 or even 4 one byte flip flops into one chip? Basically a register file with W/R, OE and 1-2 bits of address.

Sounds like 74LS670 register file might be handy. IIRC it has four registers with separate read/write address and data. (Something newer than LS might be desirable (eg.74HCT670)).


Ha! i didn't know those were still in production!


Fri Apr 26, 2019 9:06 pm
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Joined: Fri Aug 01, 2014 3:00 pm
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Quote:
Sounds like 74LS670 register file might be handy. IIRC it has four registers with separate read/write address and data. (Something newer than LS might be desirable (eg.74HCT670)).
Hehe, 74HC670s are exactly what I'm using. You need four though to get two registers visible at the same time.


Fri Apr 26, 2019 9:16 pm
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Druzyek wrote:
Quote:
Sounds like 74LS670 register file might be handy. IIRC it has four registers with separate read/write address and data. (Something newer than LS might be desirable (eg.74HCT670)).
Hehe, 74HC670s are exactly what I'm using. You need four though to get two registers visible at the same time.


so i was looking based on your comment, actually a ATF22V10 would be a single chip solution. it has enough pins and gates for you to implement a single 8-bit register design... same wincupl and programmer as the ATF16v8...


Fri Apr 26, 2019 9:34 pm
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prpplague wrote:

i created an eagle symbol and footprint for my hex decoder project - https://hackaday.io/project/163274-4-bi ... ex-decoder

i've add the 16v8.lbr to the files on that page. you can download it from there!


Thanks Dave, This has been useful !


Fri Apr 26, 2019 9:50 pm
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So, can the ATF22V10 be programmed with the TL866 series eeprom programmer as well, same as the ATF16v8 ?. I recall having read elsewhere that the ATF22V10 is particularly difficult to "burn", but maybe that was an outdated info...


Fri Apr 26, 2019 9:54 pm
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joanlluch wrote:
So, can the ATF22V10 be programmed with the TL866 series eeprom programmer as well, same as the ATF16v8 ?. I recall having read elsewhere that the ATF22V10 is particularly difficult to "burn", but maybe that was an outdated info...


i ordered some ATF22v10's in to give it a try... it will be a few weeks before i will get a chance to test...


Fri Apr 26, 2019 9:59 pm
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I've been playing with the 74LS593 register/counters in the past few weeks. I've written a blog post with a description of how they work and some gotchas with using them.

I got my 74LS versions from Utsource for only a few dollars each. I think the HCT ones are much more expensive, and I don't think you can get HC versions.

Hope this is useful.


Thu May 16, 2019 12:50 am
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DoctorWkt wrote:
I've been playing with the 74LS593 register/counters in the past few weeks. I've written a blog post with a description of how they work and some gotchas with using them.

I got my 74LS versions from Utsource for only a few dollars each. I think the HCT ones are much more expensive, and I don't think you can get HC versions.

Hope this is useful.


great write up! you should move some of that content to hackaday.io !


Thu May 16, 2019 1:06 am
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Update: I just got a decent enough logic analyser to measure the real waveforms. I've updated my 74LS593 notes with a commentary on the waveforms at the bottom. Cheers, Warren


Sun Jun 09, 2019 12:02 am
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