genesis 3 incompatible fix

jimbob005

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AmiBayer
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author=internet
The 3rd in the series, named the Genesis 3, was released by Majesco, not SEGA. Although it was under permission of SOA, that model is MK-1641, the MK 1601 is the original, and the MK 1631 is the second of the series.
The Genesis 3 does not have the Z80 processor, and that means the following:
1. Unable to run the MS convertor as it needs the Z80 chip which is the brain of the SMS.
2. Unable to run Game Genie, the Z80 must have played a role in the use of this for code break ins.
3. Unable to run special games such as Sega's Virtua Racing, which again uses the Z80.
4. Unable to run the 32x

The obvious disability of the Genesis 3 is the missing expansion port that used the purpose of running the SegaCD system

I am have restore the first 4 problems with the genesis 3 as the system is so small to have a the segacd slot on it .

well heres a pic of the insides of the gen 3 befor any things gone on this is a va1 gen 3 there is an va2 board too.
p8220166.jpg


the genesis 3 va1 model here is the missing asic pins to the cart pins and there ops
___________________________________________________________________
| B1 |Audio circuit | 32X audio left
|------|--------------------|---------------|--------------------------------
| B3 | Audio circuit | 32X audio right
|------|--------------------|---------------|--------------------------------
| B12 | ASIC pin 24 | YS (32X)
|------|--------------------|---------------|--------------------------------
| B13 | ASIC pin 25 | Vertical sync (32X)
|------|--------------------|---------------|--------------------------------
| B14 | ASIC pin 26 | Horizontal sync (32X)
|------|--------------------|---------------|--------------------------------
| B15 | ASIC pin 152 | EDCLK (32X)
|------|--------------------|---------------|--------------------------------
| B19 | ASIC pin 151 | CLK (Game Genie/Virtua Racing/32X)
|------|--------------------|---------------|--------------------------------
| B21 | ASIC pin 158 | CAS (32X)
|------|--------------------|---------------|--------------------------------
| B26 | Connected | !CE_H (Virtua Racing/32X)
|------|--------------------|---------------|--------------------------------
| B30 | ASIC pin 43 | !S_RES (MD/G<->SMS mode)
|------|--------------------|---------------|--------------------------------
| B32 | ASIC pin 42 | !CART_IN (Sega CD connector)

here the after pics pics
pa280001u.jpg

pa280002.jpg

pa280004.jpg

pa280006.jpg


pa280007.jpg



looks good

thanks james
 

Zetr0

Ya' Like it Retr0?
Joined
Nov 22, 2007
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Good to see you back in fine hackery fashion my friend!

and what better to hack than the humble megadrive!

right - so how about we add the expansion port next ?! =D

(y) (y) (y) (y)
 
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