home *** CD-ROM | disk | FTP | other *** search
- Path: uwm.edu!msunews!raine
- From: raine@msupa.pa.msu.edu (Robert Owen Raine)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: Green Screen
- Date: Fri, 05 Jan 96 14:12:49 GMT
- Organization: Michigan State University
- Message-ID: <4cjbjq$12rs@msunews.cl.msu.edu>
- References: <damocles.2voa@nostromo.gate.net>
- NNTP-Posting-Host: raine.pa.msu.edu
- X-Newsreader: News Xpress Version 1.0 Beta #3
-
- In article <damocles.2voa@nostromo.gate.net>,
- damocles@nostromo.gate.net (Randy Vice) wrote:
- >I've just bought a used Supra 28Mhz Turbo. I have have an early model A500,
- >ECS, WB 2.21 with ICD 14Mhz Accelerator and a Base Board RAM belly expansion
- >(4 Megs) and a Expansion Sys SCSI controller with RAM card.
- >
- >I've plugged in the Supra and all I get is a green screen that will flash off
- >and then back on again. I've removed both the Option and the Machine jumpers
- >and with the Expansion System controller/RAM card off and I still get the
- >green screen.
- >
- >Any suggestions on this one?
- >
- -----------------------------------------
- Power-up operation summary (tests, LED blinks, screen colors)
- (Hans Hansen)
- Newsgroups: comp.sys.amiga
- Subject: Screen colors and other boot things
- Date: 16 Jul 87 01:42:24 GMT
-
- Dark gray Ok Hardware
- Light gray Ok Software
- Red Bad ROM Checksum
- Green Bad RAM
- Blue Bad Custom Chips
- Yellow Exception
-
- (INITIALIZATION FROM OS ROMS)
- Clear Chips
- Disable DMA and Interrupts
- Clear the Screen
- Check the Hardware
- Pass or fail the Hardware to the Screen (BLUE|BAD) (DarkGray|OK)
- Checksum the ROMs
- Pass or fail the ROMs to the Screen (RED|BAD) (LightGray|OK)
- System setup (..is finished)
-
- Check the RAM at $C00000
- Move SYS_BASE to $C00000 if it exists
- RAM Test ; hummm.... not very good though needs to indicate hex location
- Pass or fail the RAM to the Screen (LED Blinks 9short 1long | GREEN | BAD)
- Check the Software
- Pass or fail the Software to the Screen (Yellow|BAD) (LightGray|OK)
- Set up the RAM
- Link the Libraries
- Find External RAM and link it to the list
- Set up Interrupts and DMA (for boot drive especially)
- Start default Task
- Check for 68010, 68020, and 68881
- Check for an Exception (System Alert?)
- System Reset (..Let the good times roll!)
-
- Tips:
- 1) Bad RAM with an internal OPEN circuit can be checked by
- "piggy-backing" the ram chip with the same type of RAM
- 2) Bad RAM with an internal SHORT circuit can be hotter to the touch
- than the rest of the RAMs
- 3) Improper removal of chips from sockets with a screwdriver can cut
- circuit traces under the chip; always check under chips and for
- damaged socket connections.
-
- 3) Push all chips down fully into sockets. Some chips may not be seated
- properly or even have bent pins. Straighten bent chip pins with a pair of
- smooth pliers.
-
- Here are some things to try. hope they help with you ram Problem.
-
-
-
- >Thanks in advance.
- >
- >: damocles@nostromo.gate.net : Bruce Morrow,a man before and after his
- time:
- >:"The Constitution shall never be construed to prevent the people of the
- :
- >:United States who are peaceable citizens from keeping their own arms."
- :
- >: - Samual Adams : Morrow Project Science: Postholocaust Party Animals
- :
-
- \|/
- @ @
- ------------------------------------------------------oOO-(_)-OOo--------------
- Only Amiga Makes it Happen Bob Raine
- The computer for the creative mind Michigan State University
- Make Up Your Own Mind Physics Astronomy Dept.
- Amiga / The Alternative Raine@msupa.pa.msu.edu
- Escom: " ANYTHING IS POSSIBLE "
- ------------------------------------------------------------------------------
-