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PostPosted: Mon Feb 29, 2016 1:49 am 
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Well .... you could add another 74'74 and just keep on daisy-chaining things, but using a 74'160/161/162/163 would be cheaper.


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PostPosted: Mon Feb 29, 2016 1:54 am 
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Heh, I have a bunch of 74LS74. What is scheme of wiring two 74LS74 for keep "daisy-chaining"?


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PostPosted: Mon Feb 29, 2016 1:32 pm 
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Notice how all the instructions (save one) were among pins named 2something?

Same thing. On one side of any 74'74, connect -nQ to +nD; -nRD and -nSD to +5V; +nQ to the address lines.

To daisy-chain them together, connect -xQ of any one side to ↑nCK of any other side. (Connect only one ↑CK to the same -Q input, otherwise they'll count the same number). Repeat as necessary.


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PostPosted: Tue Mar 01, 2016 3:07 am 
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Thanks! I'll try this.


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PostPosted: Tue Feb 05, 2019 1:43 pm 
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lidnariq wrote:
Notice how all the instructions (save one) were among pins named 2something?

Same thing. On one side of any 74'74, connect -nQ to +nD; -nRD and -nSD to +5V; +nQ to the address lines.

To daisy-chain them together, connect -xQ of any one side to ↑nCK of any other side. (Connect only one ↑CK to the same -Q input, otherwise they'll count the same number). Repeat as necessary.



Hello.Unfortunately I don't speak English well and use a translator...I'm asking you very much if you could draw a diagram for me for an 8 in 1 compilation using M27C801.I want to do 8 games 128 PRG and 128 CHR with switching on reset.As do reset from contact m2 I know.I do not know what to do next,and the picture drawn,I would be able to quickly understand everything.I will be very grateful for your help.


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PostPosted: Wed Feb 06, 2019 2:35 am 
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There are some schematics I've got from multicarts here, with a nice explanation of their differences from Lidnariq.
I'm not sure how much this configuration can be extended, so I think I'll use an 74LS93 on my next multicart project, wich will be an 8 in 1.
By the way, I did an 8 in 1 with 2x 74LS74 based on these schematics.
Hope this helps.


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PostPosted: Wed Feb 06, 2019 3:27 am 
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Fisher wrote:
There are some schematics I've got from multicarts here, with a nice explanation of their differences from Lidnariq.
I'm not sure how much this configuration can be extended, so I think I'll use an 74LS93 on my next multicart project, wich will be an 8 in 1.
By the way, I did an 8 in 1 with 2x 74LS74 based on these schematics.
Hope this helps.



Thanks a lot.I so understand these schemes only for 4 in 1 game.How to make 8 in 1 using М27С801?
128 PRG and 128 CHR.


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PostPosted: Thu Feb 07, 2019 2:02 am 
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I used this circuit as reference:
Image
Just omit the resistors and LEDs, they're your data output.
Don't forget to use the diode + capacitor circuit on the clock input, just as the schematics on that other thread.
Basically we're adding another flip-flop to the party, so the circuit can count "a bit more". :lol:
Good hacking and have fun! :wink:

I've got that gif from this blog.
Maybe that will be useful to someone else.


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PostPosted: Thu Feb 07, 2019 11:23 am 
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That circuit is a "twisted ring" counter, and will only hit six of the eight possible outputs.


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PostPosted: Thu Feb 07, 2019 4:46 pm 
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So that explains why some games on my 8 in 1 are more difficult to select than the others... :mrgreen:
And I tought it was something related to that Famiclone.
It'll be easier to look at the schematics of the other thread and add a flip-flop to one of them.

Unfortunately I don't have enough time to draw it properly, but I think Lidnariq's explanation some posts ago is clear enough to help you do a good counter.
It really seems complicated at first, but once you "digest" the information it becomes very clear!


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PostPosted: Sat Feb 09, 2019 8:00 am 
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Finally could do the draws, they're based on the ones I shared on the other thread.
Please, feel free to correct any mistakes/omissions.
Attachment:
File comment: Case 1
1,5 74ls74.png
1,5 74ls74.png [ 6.06 KiB | Viewed 4110 times ]

Attachment:
File comment: Case 2
1,5 74ls74 2.png
1,5 74ls74 2.png [ 4.66 KiB | Viewed 4110 times ]


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