I made the konami mapper diagram posted on HansO website but it does not work.
This is the schematic: http://msx.retro8bits.com/msxdocs/MapperMSXKonami.pdf
I am using a modified ISA development board and I checked all wires twice with a multimeter.
There are no short circuits and no loose connections.
When I have the logic ICs in the machine does not start. Without ICs and with the board inserted the machine boots.
And when I have all the logic ICs except the 72ls02 in the machine also boots.
The 74ls02 is OK as I have tested it with my programmer. No errors on that one.
Is this mapper circuit 100% OK? or is there something I am missing?
I hope someone can help as I want to use this circuit as the basis for other projects.

Thanks a lot,

Erik

sorry i make some error when i re-make this schematic

on 74LS670

D0 is on pin 3
D1 is on pin 2
D2 is on pin 1
D3 is on pin 15

pin 10 go to A16 pin 2 of eprom
pin 9 go to A15 pin 3 of eprom
pin 7 go to A14 pin 27 of eprom
pin 6 go to A13 pin 28 of eprom

on original PCB of zemina signal of pin 22 and 24 are inverted but is the same work

Well I changed the signals but still no luck. Black screen, not even msx logo ...

which eprom uses you and qu' you put like play game inside

I am using a m27c2001 eprom with space manbow burned on it. I used this eprom also on a modified scc cartridge without any problem.
Does it matter which eprom you use on this schematic? As I want to use a flash rom in a later stage.
Also I am using the 4mbit circuit with a 2mb eprom now.

And what kind of schematic does a standard konami megarom game without scc? Is there also a custom mapper chip in place or is it also based on 74ls670? In that case I can open a cartridge I have at home (nemesis 1) and look at it in detail over here
I appreciate your help Jipe!

space manbow is a SCC cartridge mapper is 5000 7000 9000 B000

the schematic is for a Konami cartridge mapper is 4000 6000 8000 A000 like Metal Gear , Vampire Killer , King Kong 2

if you open a nemesis 1 you found a special chip for konami mapper

OK, will try any of those later.
Do I need to switch any of the wires of the 2nd ls670? or did you only draw the the lines wrong for the first ls670?

I think that is similar zemina did not respect order of the adress signal
that must go with the two shematic but bank of eprom must be reverse with zemina eprom
i desold a zemina cartridge and check it

the rom is the same in zemina cartridge and on .rom from emulator
the order of data d0 to d3 is not the problem

i make a error : is data and not adress signal in previous post

Jipe what should I do now?
As I do not understand what is wrong

all schematic is good for a konami mapper 4000 6000 8000 A000
is the same function if D0 to D3 are reversed
burn a konami game and try it

yo Erik,

i'm building the same mapper..
I'm halfway there...

I'll let you know if mine works or not.

Jipe, do you know if it possible to modify this mapper to an scc style mapper?
Is it just a matter of using different address lines into the mapper? I have no clue (yet) how all this work and would like to learn.
As I want to use this mapper scheme for the mmc drive of sharksym. But that one expects an scc type mapper ...

Quote:

Jipe, do you know if it possible to modify this mapper to an scc style mapper? Is it just a matter of using different address lines into the mapper? I have no clue (yet) how all this work and would like to learn. As I want to use this mapper scheme for the mmc drive of sharksym. But that one expects an scc type mapper ...

SCC roms use the special SCC-chip to do the mapping.

So you'll have remove an SCC chip from an original Konami (noooo !!) and place it in your own circuit.

Or you can do the same as I (am going) do and build a std megarom mapper (so 4000 6000 8000 a000) and use an external SCC-ROM (with a switch for example) to use the SCC capabillities. This way no Konami-rom has to suffer.

yes is possible if added a decoder on write gate

inverted signal A12 and normal A11 enter in a AND gate
the out of this signal and the original signal enter in a NAND gate to the write of 74ls670

but the schematic is for read only memory eprom and not for flash