UNROM -> AOROM conversion (mapper 7) Question

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Ice Man
Posts: 530
Joined: Fri Jul 04, 2014 2:34 pm

Re: UNROM -> AOROM conversion (mapper 7) Question

Post by Ice Man » Fri Mar 20, 2020 2:33 am

No problem but looking at your text you have quite a few wrong connections:
Connected 11 pin '161 to 18 pin cartridge (CIRAM A10) -> This is correct
Connected 3 pin 27c020 to 11 pin '161 -> Not correct, this is A15 and can be connected straight in
Connected 2 pin 27c020 to 13 pin '161 -> This is correct (A16)
Connected 30 pin 27c020 to 12 pin '161 -> This is correct (A17)
Connected 24 pin 27c020 to 16 pin 27c020 -> This is correct (GND)
Connected 1 pin 27c020 to hole 1 pin prg -> Not correct, this is VPP and should be tied to VCC

As you can see, youre connecting PRG A15 with CIRAM A10 together on pin 11 of the 74'161 causing your problem , or one of it.

cardiff
Posts: 9
Joined: Wed Feb 12, 2020 3:14 pm

Re: UNROM -> AOROM conversion (mapper 7) Question

Post by cardiff » Fri Mar 20, 2020 7:16 am

Ice Man wrote:
Fri Mar 20, 2020 2:33 am
No problem but looking at your text you have quite a few wrong connections:
Connected 11 pin '161 to 18 pin cartridge (CIRAM A10) -> This is correct
Connected 3 pin 27c020 to 11 pin '161 -> Not correct, this is A15 and can be connected straight in
Connected 2 pin 27c020 to 13 pin '161 -> This is correct (A16)
Connected 30 pin 27c020 to 12 pin '161 -> This is correct (A17)
Connected 24 pin 27c020 to 16 pin 27c020 -> This is correct (GND)
Connected 1 pin 27c020 to hole 1 pin prg -> Not correct, this is VPP and should be tied to VCC

As you can see, youre connecting PRG A15 with CIRAM A10 together on pin 11 of the 74'161 causing your problem , or one of it.
Thank you very much. But the cartridge doesn 't work

Ice Man
Posts: 530
Joined: Fri Jul 04, 2014 2:34 pm

Re: UNROM -> AOROM conversion (mapper 7) Question

Post by Ice Man » Fri Mar 20, 2020 7:19 am

Can you post pictures of it? Both sides if possible.

cardiff
Posts: 9
Joined: Wed Feb 12, 2020 3:14 pm

Re: UNROM -> AOROM conversion (mapper 7) Question

Post by cardiff » Fri Mar 20, 2020 7:40 am

Ice Man wrote:
Fri Mar 20, 2020 7:19 am
Can you post pictures of it? Both sides if possible.
Yes
P_20200320_173331.jpg
P_20200320_173257.jpg
P_20200320_173248.jpg

Ice Man
Posts: 530
Joined: Fri Jul 04, 2014 2:34 pm

Re: UNROM -> AOROM conversion (mapper 7) Question

Post by Ice Man » Fri Mar 20, 2020 9:05 am

The solder jumper is not open. CIRAM A10 is confused where mirroring comes from.

Remove the solder on that and try again.

cardiff
Posts: 9
Joined: Wed Feb 12, 2020 3:14 pm

Re: UNROM -> AOROM conversion (mapper 7) Question

Post by cardiff » Fri Mar 20, 2020 9:23 am

Ice Man wrote:
Fri Mar 20, 2020 9:05 am
The solder jumper is not open. CIRAM A10 is confused where mirroring comes from.

Remove the solder on that and try again.
Without results. Checked on two consoles

Ice Man
Posts: 530
Joined: Fri Jul 04, 2014 2:34 pm

Re: UNROM -> AOROM conversion (mapper 7) Question

Post by Ice Man » Fri Mar 20, 2020 10:53 am

You also did not connect pin 1 and pin 31. Connect both to VCC.

cardiff
Posts: 9
Joined: Wed Feb 12, 2020 3:14 pm

Re: UNROM -> AOROM conversion (mapper 7) Question

Post by cardiff » Fri Mar 20, 2020 12:45 pm

Ice Man wrote:
Fri Mar 20, 2020 10:53 am
You also did not connect pin 1 and pin 31. Connect both to VCC.
Does not work. Checked contacts. 74 '161 could have broken?

Ice Man
Posts: 530
Joined: Fri Jul 04, 2014 2:34 pm

Re: UNROM -> AOROM conversion (mapper 7) Question

Post by Ice Man » Fri Mar 20, 2020 1:40 pm

Unlikely.

Did you lift all pins from 74'161 that you rewired? It's hard to see.

If you did not, then that's the problem.

Pin 6 is usually tied to GND (or VCC, don't remember) since it's unused on UNROM.

cardiff
Posts: 9
Joined: Wed Feb 12, 2020 3:14 pm

Re: UNROM -> AOROM conversion (mapper 7) Question

Post by cardiff » Fri Mar 20, 2020 2:30 pm

Ice Man wrote:
Fri Mar 20, 2020 1:40 pm
Unlikely.

Did you lift all pins from 74'161 that you rewired? It's hard to see.

If you did not, then that's the problem.

Pin 6 is usually tied to GND (or VCC, don't remember) since it's unused on UNROM.
6 pin was immediately lifted. I lift 11, 12 and 13 pins. Did not help

Ice Man
Posts: 530
Joined: Fri Jul 04, 2014 2:34 pm

Re: UNROM -> AOROM conversion (mapper 7) Question

Post by Ice Man » Sat Mar 21, 2020 2:03 am

No idea then. You can test replace the 161 and only solder in the pins that's not needed to be rewired.
Test your connections, too.

How did you program the EPROM? Did you remove the iNES header using famirom?

Zaki
Posts: 1
Joined: Sat Mar 21, 2020 2:38 am

Re: UNROM -> AOROM conversion (mapper 7) Question

Post by Zaki » Sun Mar 22, 2020 9:40 am

cardiff wrote:
Fri Mar 20, 2020 2:30 pm
Ice Man wrote:
Fri Mar 20, 2020 1:40 pm
Unlikely.

Did you lift all pins from 74'161 that you rewired? It's hard to see.

If you did not, then that's the problem.

Pin 6 is usually tied to GND (or VCC, don't remember) since it's unused on UNROM.
6 pin was immediately lifted. I lift 11, 12 and 13 pins. Did not help
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I connected it using this scheme:
UNROM-08 -> AOROM conversion (mapper 7):
Bend up pins 1, 2, 22, 24, 30, 31 and 32
remove '32 chip
cut track to pin 6 of '161
Solder pin 2 to pin 13 of '161 (A16)
Solder pin 18 to pin 6 of '161 (D4)
Solder pin 22 to GND (CE)
Solder pin 24 to pin 2 of '161 (OE)
Solder pin 30 to pin 12 or '161 (A17)
Solder pin 32 to hole 28 (+5V)
Bridge gap between pins 3 and 4 where '32 was (A14)
Bridge gap between pins 5 and 6 where '32 was (A15)
remove solder gap for either V or H
Solder FAMICOM pin 18 (CIRAM A10) to pin 11 of '161
The scheme that was on nesdev.com it didn't work for me.

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