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8 bit counter for breadboard computer http://anycpu.org/forum/viewtopic.php?f=17&t=595 |
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Author: | joanlluch [ Fri Apr 26, 2019 6:33 pm ] |
Post subject: | Re: 8 bit counter for breadboard computer |
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. |
Author: | prpplague [ Fri Apr 26, 2019 7:06 pm ] |
Post subject: | Re: 8 bit counter for breadboard computer |
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! |
Author: | Druzyek [ Fri Apr 26, 2019 7:21 pm ] |
Post subject: | Re: 8 bit counter for breadboard computer |
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. |
Author: | prpplague [ Fri Apr 26, 2019 7:39 pm ] |
Post subject: | Re: 8 bit counter for breadboard computer |
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... |
Author: | prpplague [ Fri Apr 26, 2019 8:25 pm ] |
Post subject: | Re: 8 bit counter for breadboard computer |
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.... |
Author: | robfinch [ Fri Apr 26, 2019 9:01 pm ] |
Post subject: | Re: 8 bit counter for breadboard computer |
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)). |
Author: | prpplague [ Fri Apr 26, 2019 9:06 pm ] |
Post subject: | Re: 8 bit counter for breadboard computer |
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! |
Author: | Druzyek [ Fri Apr 26, 2019 9:16 pm ] |
Post subject: | Re: 8 bit counter for breadboard computer |
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)). |
Author: | prpplague [ Fri Apr 26, 2019 9:34 pm ] |
Post subject: | Re: 8 bit counter for breadboard computer |
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)). 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... |
Author: | joanlluch [ Fri Apr 26, 2019 9:50 pm ] |
Post subject: | Re: 8 bit counter for breadboard computer |
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 ! |
Author: | joanlluch [ Fri Apr 26, 2019 9:54 pm ] |
Post subject: | Re: 8 bit counter for breadboard computer |
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... |
Author: | prpplague [ Fri Apr 26, 2019 9:59 pm ] |
Post subject: | Re: 8 bit counter for breadboard computer |
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... |
Author: | DoctorWkt [ Thu May 16, 2019 12:50 am ] |
Post subject: | Re: 8 bit counter for breadboard computer |
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. |
Author: | prpplague [ Thu May 16, 2019 1:06 am ] |
Post subject: | Re: 8 bit counter for breadboard computer |
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 ! |
Author: | DoctorWkt [ Sun Jun 09, 2019 12:02 am ] |
Post subject: | Re: 8 bit counter for breadboard computer |
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 |
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