- Thread starter twistedsymphony
- Start date
indeed. I can't wait to try this out on actual hardware. 
VectorGlow
Student
Currently trying to convert a Big Striker to Cybattler for someone but on power up I get a ROM ERROR (NOT a SOUND ROM error though, have replaced 7 and 8 to eliminate that).
This is using the modified binary for the 27C020 at location 2 (the download link from the first post of this thread) and also the MAME binary for the 27C020 at location 3
Any ideas please what may be wrong? I can't imagine that I need to program up the graphics EPROMs to eliminate that, I am assuming this error relates to the two program code EPROMs.
I programmed up the 2 and 3 EPROMs for 64th Street and they worked fine (2 is from the first post in this thread, 3 is from the World set).
Maybe the binary for EPROM 2 needs extra patching if run on original hardware? Or is there more than one set? MAME only shows one set.
Thanks
This is using the modified binary for the 27C020 at location 2 (the download link from the first post of this thread) and also the MAME binary for the 27C020 at location 3
Any ideas please what may be wrong? I can't imagine that I need to program up the graphics EPROMs to eliminate that, I am assuming this error relates to the two program code EPROMs.
I programmed up the 2 and 3 EPROMs for 64th Street and they worked fine (2 is from the first post in this thread, 3 is from the World set).
Maybe the binary for EPROM 2 needs extra patching if run on original hardware? Or is there more than one set? MAME only shows one set.
Thanks
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I've never tried running without the graphics ROMs also swapped but I have played the through the game multiple times on actual hardware.
I would install the graphis roms first and see how that goes.
I would install the graphis roms first and see how that goes.
VectorGlow
Student
Thanks, I'll give that a go. I had just assumed that only the program code was checked during POST. I'll report back when I've tried it (might not be today though, unsure).
Edit: turns out that it was one of the program EPROMs at fault after all, despite it verifying okay in my programmer .........
Edit: turns out that it was one of the program EPROMs at fault after all, despite it verifying okay in my programmer .........
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xodaraP
Legendary
Can someone who has done this conversion do me a favour? I've got an original I'm trying to sort out and I think the PROM has died
I need to know which pins show activity on the PROM, I have several that show nothing at all and I'm not sure if that's intentional or not.
Also, @twistedsymphony - from your programming, do you know which pins are input and which are output?
I need to know which pins show activity on the PROM, I have several that show nothing at all and I'm not sure if that's intentional or not.
Also, @twistedsymphony - from your programming, do you know which pins are input and which are output?
the BPROMs are standard 82S131
I Honestly don't know if all of the address lines would show activity based on how the main board uses them.
I Honestly don't know if all of the address lines would show activity based on how the main board uses them.
EDF seems to be running well, the sound works now it and as far as i know all graphics are correct with the correct p-rom.
Twisted has had this hack running with the correct p-rom and played to the end with no errors.
You can see my testing above with the wrong prom, it's the same but with sound at the moment.
Just need to clean up the code and fix the test mode that got broken sometime near the end of the hacking it was running fine at early stages.
I also have avenging spirit running but only to the end of level 1.
This game is tricky because there's loads of stuff in there and all the addresses are read from tables (not my favorite, but can be quicker at times)
Whats more, with the wrong prom the character layer is obscured by scroll 1 so it's more or less unplayable past lev 1 with the wrong prom.
Also this game has a lot of secret rooms and stuff... so lots of play needed to 'get' everything.
Good job the code is full of funny bits like checking P . BRAIN copied to the ram successfully as some sort of security check haha.
You can find this one written to ram around 78800 on set 1. The check does not seem to be in phantasm set.
Any of these jaleco will port to any other mega system 1 platform, the ram is not a problem.
To be honest the older hardware looks better to make the multigame at this point, it's less work porting games, less destructive and the overall job will be a lot neater in end.
So avenging spirit will be the last one for the Mega 1C.
I think porting the mega A games to mega C & B may also introduce input lag with the MCU and slowdown to the main code where the data requests will be added.
With the A system's setup the B & C game controls can only get faster inputs and gameplay (don't need to waste time sending data requests to the mcu).
The z system Legend of makai.... had the pcb in for a bit not long ago, not an amazing game but worth a play and the time porting to the rom board based system A but not worth the time porting to the C system.
Can have it play some kind of sound maybe not the correct / perfect thing due to sound chips.
The other oddball hardware is a porno game that uses a spinner, not worth the time converting either way.
It's a scroll layer fault, but you need to know what scroll layer and it's 'easy' from there.
The 'scroll rom' each has it's own set of 2 customs and 2 ram (a bit like a mini version of mid era konami video setups). check the ram, bad soldering on those customs or a dead chip/line or maybe lucky the rom / socket is bad that's all it can be basically.
If you have problems with more than one scroll layer (text layer counts as scroll 2) then the issue will be further back to the processor before the rom / customs.
A very long post there, hopefully helps out people on jaleco boards.
Twisted has had this hack running with the correct p-rom and played to the end with no errors.
You can see my testing above with the wrong prom, it's the same but with sound at the moment.
Just need to clean up the code and fix the test mode that got broken sometime near the end of the hacking it was running fine at early stages.
I also have avenging spirit running but only to the end of level 1.
This game is tricky because there's loads of stuff in there and all the addresses are read from tables (not my favorite, but can be quicker at times)
Whats more, with the wrong prom the character layer is obscured by scroll 1 so it's more or less unplayable past lev 1 with the wrong prom.
Also this game has a lot of secret rooms and stuff... so lots of play needed to 'get' everything.
Good job the code is full of funny bits like checking P . BRAIN copied to the ram successfully as some sort of security check haha.
You can find this one written to ram around 78800 on set 1. The check does not seem to be in phantasm set.
Any of these jaleco will port to any other mega system 1 platform, the ram is not a problem.
To be honest the older hardware looks better to make the multigame at this point, it's less work porting games, less destructive and the overall job will be a lot neater in end.
So avenging spirit will be the last one for the Mega 1C.
I think porting the mega A games to mega C & B may also introduce input lag with the MCU and slowdown to the main code where the data requests will be added.
With the A system's setup the B & C game controls can only get faster inputs and gameplay (don't need to waste time sending data requests to the mcu).
The z system Legend of makai.... had the pcb in for a bit not long ago, not an amazing game but worth a play and the time porting to the rom board based system A but not worth the time porting to the C system.
Can have it play some kind of sound maybe not the correct / perfect thing due to sound chips.
The other oddball hardware is a porno game that uses a spinner, not worth the time converting either way.
You posted a pic somewhere of this problem, it is NOT prom related. Post a video and maybe i can help.
It's a scroll layer fault, but you need to know what scroll layer and it's 'easy' from there.
The 'scroll rom' each has it's own set of 2 customs and 2 ram (a bit like a mini version of mid era konami video setups). check the ram, bad soldering on those customs or a dead chip/line or maybe lucky the rom / socket is bad that's all it can be basically.
If you have problems with more than one scroll layer (text layer counts as scroll 2) then the issue will be further back to the processor before the rom / customs.
A very long post there, hopefully helps out people on jaleco boards.
xodaraP
Legendary
Interesting, ok. I'll take a video, it's not the ROM or the socket (I've tried replacing both already)
It's only happening with one of the 2 layers, which is why I thought it might be the PROM.
It's only happening with one of the 2 layers, which is why I thought it might be the PROM.
so which games other than big striker are able to be donor or is only big striker.
only Big Striker
keep in mind that there are only 4 games on this hardware platform
1. Big Striker - an uncommon but usually cheap soccer game
2. 64th Street Detective - an uncommong but very expensive (>$400) beat-em-up
3. Cybattler - an uncommon by very expensive (>$400) SHMUP
4. Chimera Beast - A prototype SHMUP (probably >$1000, but I've never seen one for sale)
so yeah. Big Striker and only Big Striker
Damn I need to find it.
We need a multi
For now
A wise man waits because
In the long run it's going to a mega system 1A multi, the best you will get on the 1c is a 6 in 1 switcher.We need a multi
Mega 1A you're talking around 20 games including the above 6 ported over lol will take some time tho.
Do you really think the MS1C games will work on the MS1A hardware? the CPU is clocked at half the speed?
MS1B games wont even really need to be ported since there are already MS1A variants available.
But yes, MS1A Multi will be the better option in the long run.
MS1B games wont even really need to be ported since there are already MS1A variants available.
But yes, MS1A Multi will be the better option in the long run.
The mega 1c had half the ram, but that did not stop anything did itDo you really think the MS1C games will work on the MS1A hardware? the CPU is clocked at half the speed?
MS1B games wont even really need to be ported since there are already MS1A variants available.
But yes, MS1A Multi will be the better option in the long run.
This check is part of the debug / monitoring system
Sounds sweet to me, so sounds like a multi for the Mega System 1 is doable
