• DE Jurassic Park froze during game now does not boot

    From Cliff@Cliff2C@aol.com to rec.games.pinball on Friday, January 22, 2021 16:27:01
    From Newsgroup: rec.games.pinball

    When it happened I was having a great game!
    Machine froze during stampede and I shut it down.
    After that, it would occasionally show the version of the DMD and the dinosaur gives one roar on power up.
    The blanking light never lights up.
    I have removed the board and tested it with a power supply at 5.01 volts and it will not boot.
    I have purchased the DE test rom from Marco and I am waiting its arrival.
    I also purchased a new ( to me) 6802 from PBL and the newest rom from Matts Basement.
    I am waiting for all of this to arrive.
    If I cannot solve my problem with the test eprom, I will be poking around with a logic probe. I own one but have not yet used it.
    I also am waiting for some stuff from GPE. I got all the caps on the original PS and the sound board. I ordered some 6821s and some peripheral chips in the blanking circuit according to the schematic.
    Has anyone else been thru this?
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  • From Cliff@Cliff2C@aol.com to rec.games.pinball on Saturday, March 06, 2021 14:23:42
    From Newsgroup: rec.games.pinball

    On Friday, January 22, 2021 at 7:27:07 PM UTC-5, Cliff wrote:
    When it happened I was having a great game!
    Machine froze during stampede and I shut it down.
    After that, it would occasionally show the version of the DMD and the dinosaur gives one roar on power up.
    The blanking light never lights up.
    I have removed the board and tested it with a power supply at 5.01 volts and it will not boot.
    I have purchased the DE test rom from Marco and I am waiting its arrival.
    I also purchased a new ( to me) 6802 from PBL and the newest rom from Matts Basement.
    I am waiting for all of this to arrive.
    If I cannot solve my problem with the test eprom, I will be poking around with a logic probe. I own one but have not yet used it.
    I also am waiting for some stuff from GPE. I got all the caps on the original PS and the sound board. I ordered some 6821s and some peripheral chips in the blanking circuit according to the schematic.
    Has anyone else been thru this?
    Turned out to be a bad NVRAM chip.
    I should have bought the test chip first. Figured it out right away. No boot, installed original ram and it booted right up.
    Bought new NVRAM and we are off to the races....
    --- Synchronet 3.18c-Win32 NewsLink 1.113
  • From John Robertson@spam@flippers.com to rec.games.pinball on Saturday, March 06, 2021 14:39:16
    From Newsgroup: rec.games.pinball

    On 2021/03/06 2:23 p.m., Cliff wrote:
    On Friday, January 22, 2021 at 7:27:07 PM UTC-5, Cliff wrote:
    When it happened I was having a great game!
    Machine froze during stampede and I shut it down.
    After that, it would occasionally show the version of the DMD and the dinosaur gives one roar on power up.
    The blanking light never lights up.
    I have removed the board and tested it with a power supply at 5.01 volts and it will not boot.
    I have purchased the DE test rom from Marco and I am waiting its arrival.
    I also purchased a new ( to me) 6802 from PBL and the newest rom from Matts Basement.
    I am waiting for all of this to arrive.
    If I cannot solve my problem with the test eprom, I will be poking around with a logic probe. I own one but have not yet used it.
    I also am waiting for some stuff from GPE. I got all the caps on the original PS and the sound board. I ordered some 6821s and some peripheral chips in the blanking circuit according to the schematic.
    Has anyone else been thru this?
    Turned out to be a bad NVRAM chip.
    I should have bought the test chip first. Figured it out right away. No boot, installed original ram and it booted right up.
    Bought new NVRAM and we are off to the races....


    The NVRAM might have gotten invalid data. If you have a suitable EPROM programmer try clearing the NVRAM to all FFs and see if it works again.

    John :-#)#
    --
    (Please post followups or tech inquiries to the USENET newsgroup)
    John's Jukes Ltd.
    MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
    (604)872-5757 (Pinballs, Jukes, Video Games)
    www.flippers.com
    "Old pinballers never die, they just flip out."
    --- Synchronet 3.18c-Win32 NewsLink 1.113
  • From Cliff@Cliff2C@aol.com to rec.games.pinball on Saturday, March 06, 2021 15:50:28
    From Newsgroup: rec.games.pinball

    On Saturday, March 6, 2021 at 5:39:27 PM UTC-5, John Robertson wrote:
    On 2021/03/06 2:23 p.m., Cliff wrote:
    On Friday, January 22, 2021 at 7:27:07 PM UTC-5, Cliff wrote:
    When it happened I was having a great game!
    Machine froze during stampede and I shut it down.
    After that, it would occasionally show the version of the DMD and the dinosaur gives one roar on power up.
    The blanking light never lights up.
    I have removed the board and tested it with a power supply at 5.01 volts and it will not boot.
    I have purchased the DE test rom from Marco and I am waiting its arrival. >> I also purchased a new ( to me) 6802 from PBL and the newest rom from Matts Basement.
    I am waiting for all of this to arrive.
    If I cannot solve my problem with the test eprom, I will be poking around with a logic probe. I own one but have not yet used it.
    I also am waiting for some stuff from GPE. I got all the caps on the original PS and the sound board. I ordered some 6821s and some peripheral chips in the blanking circuit according to the schematic.
    Has anyone else been thru this?
    Turned out to be a bad NVRAM chip.
    I should have bought the test chip first. Figured it out right away. No boot, installed original ram and it booted right up.
    Bought new NVRAM and we are off to the races....

    The NVRAM might have gotten invalid data. If you have a suitable EPROM programmer try clearing the NVRAM to all FFs and see if it works again.

    John :-#)#

    --
    (Please post followups or tech inquiries to the USENET newsgroup)
    John's Jukes Ltd.
    MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
    (604)872-5757 (Pinballs, Jukes, Video Games)
    www.flippers.com
    "Old pinballers never die, they just flip out."
    Thanks John,
    Unfortunately, I do not have the access to a programmer; the machine or a person to do it.

    The failure of the NVRAM is unusual in that it happened mid game.
    I am still not convinced that the failure of the NVRAM was not a symptom of another issue.
    The NVRAM was in the game for 18 months with about 200 plays or so. Probably booted up 50 to 100 times. It was never really left on for any extended time.
    I recapped the power supply though the 5 volts remained the same before and after.
    I also recapped the sound board. These repairs were done because I have owned the game for 14 years and have had to do nothing to it.
    I have other games with NVRAM in them. Just seems odd.
    --- Synchronet 3.18c-Win32 NewsLink 1.113
  • From John Robertson@spam@flippers.com to rec.games.pinball on Saturday, March 06, 2021 16:48:01
    From Newsgroup: rec.games.pinball

    On 2021/03/06 3:50 p.m., Cliff wrote:
    On Saturday, March 6, 2021 at 5:39:27 PM UTC-5, John Robertson wrote:
    On 2021/03/06 2:23 p.m., Cliff wrote:
    On Friday, January 22, 2021 at 7:27:07 PM UTC-5, Cliff wrote:
    When it happened I was having a great game!
    Machine froze during stampede and I shut it down.
    After that, it would occasionally show the version of the DMD and the dinosaur gives one roar on power up.
    The blanking light never lights up.
    I have removed the board and tested it with a power supply at 5.01 volts and it will not boot.
    I have purchased the DE test rom from Marco and I am waiting its arrival. >>>> I also purchased a new ( to me) 6802 from PBL and the newest rom from Matts Basement.
    I am waiting for all of this to arrive.
    If I cannot solve my problem with the test eprom, I will be poking around with a logic probe. I own one but have not yet used it.
    I also am waiting for some stuff from GPE. I got all the caps on the original PS and the sound board. I ordered some 6821s and some peripheral chips in the blanking circuit according to the schematic.
    Has anyone else been thru this?
    Turned out to be a bad NVRAM chip.
    I should have bought the test chip first. Figured it out right away. No boot, installed original ram and it booted right up.
    Bought new NVRAM and we are off to the races....

    The NVRAM might have gotten invalid data. If you have a suitable EPROM
    programmer try clearing the NVRAM to all FFs and see if it works again.

    John :-#)#
    Thanks John,
    Unfortunately, I do not have the access to a programmer; the machine or a person to do it.

    The failure of the NVRAM is unusual in that it happened mid game.
    I am still not convinced that the failure of the NVRAM was not a symptom of another issue.
    The NVRAM was in the game for 18 months with about 200 plays or so. Probably booted up 50 to 100 times. It was never really left on for any extended time.
    I recapped the power supply though the 5 volts remained the same before and after.
    I also recapped the sound board. These repairs were done because I have owned the game for 14 years and have had to do nothing to it.
    I have other games with NVRAM in them. Just seems odd.


    Ah, then it was FM in other words... Friggin Magic!

    John :-#)#
    --
    (Please post followups or tech inquiries to the USENET newsgroup)
    John's Jukes Ltd.
    MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
    (604)872-5757 (Pinballs, Jukes, Video Games)
    www.flippers.com
    "Old pinballers never die, they just flip out."
    --- Synchronet 3.18c-Win32 NewsLink 1.113