SL2ROM pinout

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guitarzombie
Posts: 164
Joined: Sat Dec 07, 2013 6:18 pm

SL2ROM pinout

Post by guitarzombie » Wed Apr 15, 2015 9:13 am

Im using Blaster Master to make something and I forgot it was an SL2ROM, so im taking a look at its pinout. It turns out that SL2ROM is an SLROM board, 256 PRG 128 CHR BUT the prg uses a mask rom pinout and the CHR uses an EPROM pinout.

SL2ROM CHR:

5+ 1 32 5+
A16 2 31 5+
A15 3 30 5+
A12 4 29 A14
A7 5 28 A13
A6 6 27 A8
A6 7 26 A9
A4 8 25 A11
A3 9 24 /CE (Attatched to cart edge 21)
A2 10 23 A10
A1 11 22 /CE (Attatched to cart edge 65)
A0 12 21 D7
D0 13 20 D6
D1 14 19 D5
D2 15 18 D4
GND 16 17 D3


So aside from this, I know that SF1ROM uses an EPROM pinout for the PRG. I wonder why they did this?

Also why is the chip revision number the same for the CHR? (NES-VM-0). When they did that with Bases loaded (SFROM), they had a different PRG revision for SF1ROM (NES-LD-2)

FrankWDoom
Posts: 240
Joined: Mon Jan 23, 2012 11:27 pm

Re: SL2ROM pinout

Post by FrankWDoom » Wed Apr 15, 2015 9:36 am

in the NES-xx-a code the "a" indicates the data revision. It doesn't have anything to do with the hardware. The -2 on your bases loaded cart indicates the prg has been revised and sold at least twice since the initial release. The -0 build was fatally broken, hence the patch chip on those boards. There's also a -1 version, but it apparently also had issues that required changes.

guitarzombie
Posts: 164
Joined: Sat Dec 07, 2013 6:18 pm

Re: SL2ROM pinout

Post by guitarzombie » Wed Apr 15, 2015 10:05 am

Ah ha, thanks for the input

guitarzombie
Posts: 164
Joined: Sat Dec 07, 2013 6:18 pm

Re: SL2ROM pinout

Post by guitarzombie » Wed Apr 15, 2015 10:31 pm

FrankWDoom wrote:in the NES-xx-a code the "a" indicates the data revision. It doesn't have anything to do with the hardware. The -2 on your bases loaded cart indicates the prg has been revised and sold at least twice since the initial release. The -0 build was fatally broken, hence the patch chip on those boards. There's also a -1 version, but it apparently also had issues that required changes.
Id also liked to add that the LD-0 that you said was fatally broken uses a SFEXROM board, or something like that.
BUT the LD-1 uses a regular SFROM board and the LD-2 uses the SF1ROM board, with their only difference is the PRGs pinout (LD-1 being mask rom, 256 size and LD-2 being EPROM 020 size). Whys that?

I can understand SLROM and SL1ROM games, where it might have been cheaper to use the 28 DIP chips they had to program them for CHRs, (altho i think they needed another logic chip).

FrankWDoom
Posts: 240
Joined: Mon Jan 23, 2012 11:27 pm

Re: SL2ROM pinout

Post by FrankWDoom » Thu Apr 16, 2015 9:38 am

No idea.

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