Arcade Collecting > Merit/JVL Touchscreen
Megatouch XL - motherboard ??
cush:
Ok I will get a proper meter and try again tomorrow as I used a small pocket thing.
now on your 2nd points: where you say 2banks of 4 and 1 bank of 8 this is what Im getting confused with, as I stated in first post I think it is the older style I/o card as it has the blue volume disc but has ds2 (which is 1 to 8) & ds3 (which is 1 to 8), the classic pdf states that the older board with volume disc should have a ds1 but mine doesn't.
pic:
http://i128.photobucket.com/albums/p187/HuMpH_02/Arcade/IMG_0133.jpg
http://i128.photobucket.com/albums/p187/HuMpH_02/Arcade/IMG_0136.jpg
I have some compound so I can redo the micro, but this machine has no hard drive from what I can make out it uses the u12 rom on I/o card as the c: drive then uses the cd rom.
I think I may also have some spare battery too so can change that.
Thanks for your help I appreciate it.
ed12:
i will chk my riser cards when i go the warehouse tomrow
and get back to u..
i will also chk this no hard drive thing as i have never seen that before
maybe shawn can chime in here on that point?
ok your's has 2 banks of 8
i will dig out the proper setings
i c u12 but i was always under the thought that is where the o/s for game type was stored,the chip above it is your :key-chip:,and it is plenty bad enough to cause u this problem,if u can replace it,it is a simple dallas chip.
ed
ed
smartbomb2084:
DIP switches on an XL I/O board are not used...they should all be OFF.
cush:
--- Quote from: smartbomb2084 on January 15, 2014, 09:20:53 am ---DIP switches on an XL I/O board are not used...they should all be OFF.
--- End quote ---
ok thanks, must have bigger problems then :banghead:
ed12:
ok brought home to complete mobo's with riser's and i/o's
now i see where the confusion comes in
on the i/o board u will c
u11=dallas ds1230 barrtey back-up ram
u12=sa3014-xx your key chip and part of the lower level game
u13=29f040 atmel chip >your main game rom<
now also which i am clear this has never been told to u
but these unit's are j-tag-able
ie look at the far side of u13 u will find
a set of row of pins,these are called :bed of mails test point:
u can read/write or do any thing u want to the board,even at the lowest level..
i can bet i can dump both the atmel >no brainer and the key chip<..
i would love to know what the machine would do if u just run it without a cd in it ?
ed
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