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 Post subject: will this work?
PostPosted: Fri Oct 14, 2005 10:24 am 
ok, im about to make my first repro cart...very exciting. i want to put Yie Ar Kung Fu on a Super Mario Bros. cart, both are NROMs. I have split the .nes file into a PRG and CHR files. I have 2 27c512 eproms to burn them onto. the board is desoldered and ready for chips. now, can i just put the burn the eproms and solder them onto the board, with no extra wiring?


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 Post subject:
PostPosted: Fri Oct 14, 2005 10:38 am 
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Joined: Mon Apr 11, 2005 6:04 am
Posts: 20
Location: Kiev, Ukraine
I don't think 27c512's will fit without some rewiring. Why can't you just use a 27(c)64 for VROM and a 27(c)256 for PRGROM? No rewiring needed, just solder two sockets, insert eproms and cart ready for use.

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 Post subject:
PostPosted: Fri Oct 14, 2005 10:55 am 
i got a good deal on the 512's, so i figured i could use them for all files under 128k. i didnt know that i should use the exact fitting eprom for the file, like i said, im a new at this.

family_programmer wrote:
I don't think 27c512's will fit without some rewiring. Why can't you just use a 27(c)64 for VROM and a 27(c)256 for PRGROM? No rewiring needed, just solder two sockets, insert eproms and cart ready for use.


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 Post subject:
PostPosted: Fri Oct 14, 2005 4:38 pm 
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Joined: Fri Sep 24, 2004 4:10 pm
Posts: 56
Location: Louisville, KY
What are the file size's? (PRG CHR). Also, make an account and stop posting as guest lol


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 Post subject:
PostPosted: Fri Oct 14, 2005 11:57 pm 
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Location: Indianapolis
Smaller files are OK on larger roms, as long as the extra address lines aren't left floating (unconnected). You can just fill the chip up with the data repeated several times to be sure.


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 Post subject:
PostPosted: Sat Oct 15, 2005 6:26 am 
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sorry, i always forget to log in. the file sizes are 16 k PRG and 8k CHR. So i can just fill up the chip until it is full with the same file and then just solder the chip on with no extra wiring?


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 Post subject:
PostPosted: Sat Oct 15, 2005 6:58 am 
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Joined: Fri Sep 24, 2004 4:10 pm
Posts: 56
Location: Louisville, KY
coinheaven wrote:
sorry, i always forget to log in. the file sizes are 16 k PRG and 8k CHR. So i can just fill up the chip until it is full with the same file and then just solder the chip on with no extra wiring?


Yep, just do copy /b file.prg+file.prg+file.prg file_copied.prg

to make it the same file size as the eprom itself


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 Post subject:
PostPosted: Sun Oct 16, 2005 9:57 am 
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Joined: Sat Sep 17, 2005 12:26 pm
Posts: 278
i dont understand this, do you do this with the eprom software?

Necrosaro420 wrote:
coinheaven wrote:
sorry, i always forget to log in. the file sizes are 16 k PRG and 8k CHR. So i can just fill up the chip until it is full with the same file and then just solder the chip on with no extra wiring?


Yep, just do copy /b file.prg+file.prg+file.prg file_copied.prg

to make it the same file size as the eprom itself


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 Post subject:
PostPosted: Mon Oct 17, 2005 1:10 pm 
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Joined: Sat Sep 17, 2005 12:26 pm
Posts: 278
do i type this in or is this an action? im using a willem programmer. thanks

Necrosaro420 wrote:
coinheaven wrote:
sorry, i always forget to log in. the file sizes are 16 k PRG and 8k CHR. So i can just fill up the chip until it is full with the same file and then just solder the chip on with no extra wiring?


Yep, just do copy /b file.prg+file.prg+file.prg file_copied.prg

to make it the same file size as the eprom itself


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 Post subject:
PostPosted: Mon Oct 17, 2005 1:21 pm 
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Joined: Tue Sep 21, 2004 12:11 am
Posts: 377
Location: Karlshamn (Sweden)
you type it in a dos-prompt..
to open one in windows
click on "start" and then "run"
then type in cmd (in win2k or newer) or command (in all win9x)
then type in cd (path to your folder containing your prg file)
now you type in (were input_file.prg is your prg file):
copy /b input_file.prg+input_file.prg+input_file.prg output_file.prg
for every +input_file.prg you append 'input_file.prg' to the end of output_file.prg and in this case that means output_file.prg will contain 3 copies of input_file.prg. now you can burn your (e)eprom/flash with output_file.prg

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 Post subject:
PostPosted: Mon Oct 17, 2005 4:45 pm 
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Joined: Sat Sep 17, 2005 12:26 pm
Posts: 278
ok, i made the PRG and CHR files 64k and burned them to 27c512 eproms and attached them to the NROM board but all i get on the tv screen is a black and white scrambled buzzing screen. any idea what im doing wrong? do i need to solder it for it to work? i didnt want to do this yet since this is my first game and am still working out the kinks. thanks


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 Post subject:
PostPosted: Mon Oct 17, 2005 4:52 pm 
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Joined: Fri Sep 24, 2004 4:10 pm
Posts: 56
Location: Louisville, KY
coinheaven wrote:
ok, i made the PRG and CHR files 64k and burned them to 27c512 eproms and attached them to the NROM board but all i get on the tv screen is a black and white scrambled buzzing screen. any idea what im doing wrong? do i need to solder it for it to work? i didnt want to do this yet since this is my first game and am still working out the kinks. thanks



It SHOULD be soldered to assure that the contacts are making, um, contact =) I would try that.


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 Post subject:
PostPosted: Mon Oct 17, 2005 5:00 pm 
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Joined: Sat Sep 17, 2005 12:26 pm
Posts: 278
ok, but how do the chips go on the board? i have them with the letters to the right.

Necrosaro420 wrote:
coinheaven wrote:
ok, i made the PRG and CHR files 64k and burned them to 27c512 eproms and attached them to the NROM board but all i get on the tv screen is a black and white scrambled buzzing screen. any idea what im doing wrong? do i need to solder it for it to work? i didnt want to do this yet since this is my first game and am still working out the kinks. thanks



It SHOULD be soldered to assure that the contacts are making, um, contact =) I would try that.


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 Post subject:
PostPosted: Mon Oct 17, 2005 5:23 pm 
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Joined: Sun Sep 19, 2004 11:12 pm
Posts: 19498
Location: NE Indiana, USA (NTSC)
There's a little semicircular notch in one of the ends of the chip. The notch on the chip should be on the same side as the notch symbol on the board.


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 Post subject:
PostPosted: Mon Oct 17, 2005 6:07 pm 
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Joined: Sat Sep 17, 2005 12:26 pm
Posts: 278
Sweet, i got it working!!!!! thanks alot for everyones help.


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