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Title: Dotmation checksum error chksum Post by: cfh on February 06, 2009, 01:56:15 AM Just for the notes, on the dotmation, when you get a checksum error:
PROM0 = xu10 PROM1 = xu3 PROM2 = xu4 EPROM speed on the xu3 and xu4 seem to be an issue. I have burned ROMs with good checksums, but the game complains "PROM1 chksum error" type thing. reburn on a different EPROM and the problem goes away. seems like 100ns or faster is needed for the dotmation. Not nearly an issue for the CPU board EPROMs. Title: Re: Dotmation checksum error Post by: knagl on February 06, 2009, 07:36:28 AM Good info -- thanks Clay! :3-
Title: Re: Dotmation checksum error chksum Post by: Randy0777 on May 20, 2009, 11:11:59 AM Thanks Clay. Just switched chips and Prom1 error is what I'm getting...atleast I know what it is now.
Title: Re: Dotmation checksum error chksum Post by: knagl on May 20, 2009, 07:10:14 PM You'll also get checksum errors if you use different size EPROMs and don't change the jumpers. Some games require different sized dot EPROMs and jumper changes to go with them. :71-
Title: Re: Dotmation checksum error chksum Post by: Randy0777 on May 20, 2009, 07:29:19 PM Thanks knagl . I thought about that when the error came up ,but for some reason I did not think that was it :25- . I did a search for "Prom1 error" and seen what Clay said and figured I needed to burn another chip. After reading your comment,I checked the chips....Sure enough u3 on the one I took out was a 4 and the one I installed was a 8 :52- . Anyway,I just installed a differnt game all together (at least I learned the juristiction RN3 jumpers today :89- ) Off to pool league,so I'll try the game again when I get home.
Title: Re: Dotmation checksum error chksum Post by: Randy0777 on May 27, 2009, 02:25:52 AM Finally got around to fixing the problem.... burnt a new chip and all was well. (Sorta :103-,)
Title: Re: Dotmation checksum error chksum Post by: cfh on May 27, 2009, 08:16:03 AM On the dotmation display board, EPROM speed (or lack or it)
can often cause a checksum error. reburning the chip usually fixes the problem (assuming the 4/8meg jumper is set correctly.) Title: Re: Dotmation checksum error chksum Post by: Billythekid on March 09, 2010, 01:22:08 AM I'm having the same problem, I couldn't find any documentation on the jumper positions for 1 vs. 4meg chips.... they are 3 prong jumpers so you can connect center to top or center to bottom or completely off... anyone know which way is which?
Also there are two jumpers next to the OS chip on the dotmation controller... where should those be? My OS boots up just fine... just getting checksum on XU3.. Title: Re: Dotmation checksum error chksum Post by: knagl on March 09, 2010, 02:33:09 AM ...without being near my machine, I'd try moving the jumper for the XU3 (in the Dot box) to the "other" position and try booting it.
Title: Re: Dotmation checksum error chksum Post by: Billythekid on March 09, 2010, 03:07:24 AM I have the newest OS version running in the top box and when testing a known set of good game display chips the jumper postion does not matter. The known chips at 4001's for Big Bang. I'll have to get a new set of game chips for the game I'm trying to install.
Title: Re: Dotmation checksum error chksum Post by: Neonkiss on March 09, 2010, 11:53:03 PM I have the newest OS version running in the top box and when testing a known set of good game display chips the jumper postion does not matter. The known chips at 4001's for Big Bang. I'll have to get a new set of game chips for the game I'm trying to install. Remember top game chips MUST match the game chips on the MPU. For trouble shooting purposes you can not change just the top dot box chips with another set of game chips in the MPU. |