Hi so I have been pounding my head the last few weeks with information and while I have obtained much needed info there are still a few areas I would like additional help on.
First I'm a long time collector and have a very extensive collection. My collection can be viewed in a thread at Atari age or at my photo bucket.
http://atariage.com/forums/topic/193595 ... try2754794
http://s14.photobucket.com/user/icemanx ... t=3&page=1
I will start w/what I know or at least think I know
nes games consist of 2 files chr "character" and prg "programming"
on original nes games these files can be various sizes most being 128 Kb or 256 Kb.
I will use a NES-TLROM-03 board as my discussion here.
That board has a 32 dip chr but prg can be 28 dip or 32 dip. This is where I start getting confused. Why a board can have diff. prg dips. Examples will be bases loaded 3 which has a 32 dip prg and days of thunder which has a 28 dip prg but they are both a NES-TLROM-03 board?
I have come up with this: the 32 has 4 extra pins pin 1=a17, pin 2=/ce pin 32= +5, and pin 31=+5, my theory is I could use say bases loaded donor and install a 32 dip chip and maybe program that chip staring at pin 3 and ending at pin 30 and not use the other 4 pins. Or I could just toss a 28 dip eprom in the board and not use those 4 slots at all?
As far as eproms go I have purchased some AMD AM27C128 and AMD AM27C256 chips both 150 speed. These are only 28 dips so it appears I need to get some 32 dips. However the 32 dips are not made that small. I purchased the AMD AM27C256 chips before I realized all 256 chips have to be 32 dip.
My theory from what I have read Is that I can still use these AMD AM27C256 28 dip chips for 128 files by doubling them. This now gets me to the 32 dip chips. From what I read I need to get a chip like AMD AM27C010 I am thinking 120 speed as they are plentiful. I figure on 128 files I will copy them 8 times and on 256 files I will copy them 4 times.
How am I doing so far? Thanks for all help in advance.
First I'm a long time collector and have a very extensive collection. My collection can be viewed in a thread at Atari age or at my photo bucket.
http://atariage.com/forums/topic/193595 ... try2754794
http://s14.photobucket.com/user/icemanx ... t=3&page=1
I will start w/what I know or at least think I know
nes games consist of 2 files chr "character" and prg "programming"
on original nes games these files can be various sizes most being 128 Kb or 256 Kb.
I will use a NES-TLROM-03 board as my discussion here.
That board has a 32 dip chr but prg can be 28 dip or 32 dip. This is where I start getting confused. Why a board can have diff. prg dips. Examples will be bases loaded 3 which has a 32 dip prg and days of thunder which has a 28 dip prg but they are both a NES-TLROM-03 board?
I have come up with this: the 32 has 4 extra pins pin 1=a17, pin 2=/ce pin 32= +5, and pin 31=+5, my theory is I could use say bases loaded donor and install a 32 dip chip and maybe program that chip staring at pin 3 and ending at pin 30 and not use the other 4 pins. Or I could just toss a 28 dip eprom in the board and not use those 4 slots at all?
As far as eproms go I have purchased some AMD AM27C128 and AMD AM27C256 chips both 150 speed. These are only 28 dips so it appears I need to get some 32 dips. However the 32 dips are not made that small. I purchased the AMD AM27C256 chips before I realized all 256 chips have to be 32 dip.
My theory from what I have read Is that I can still use these AMD AM27C256 28 dip chips for 128 files by doubling them. This now gets me to the 32 dip chips. From what I read I need to get a chip like AMD AM27C010 I am thinking 120 speed as they are plentiful. I figure on 128 files I will copy them 8 times and on 256 files I will copy them 4 times.
How am I doing so far? Thanks for all help in advance.