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- From: rforster@galaxy.gov.bc.ca (Russ Forster)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: My AMIGA is now CYAN ONLY!!!
- Message-ID: <1992Aug28.172100.926@galaxy.gov.bc.ca>
- Date: 28 Aug 92 17:21:00 -0700
- References: <jyork.714365075@pv343d.vincent.iastate.edu>
- Organization: BC Systems Corporation
- Lines: 104
-
- In article <jyork.714365075@pv343d.vincent.iastate.edu>, jyork@iastate.edu (Justin York) writes:
- >
- > Can anyone out there tell me what has happened to my Amiga? I moved it up
- > to college (no more bumps than normal...) and when I hooked it up, the
- > monitor displays only shades of cyan! I have tried re-setting the monitor
- > controls, and have tried different cables, so my conclusion is that it it
- >
- > A) The 1084S telling me it will soon be leaving me :(
- >
- > or
- >
- > B) The Denise chip telling me it is time to upgrade :)
- >
- >
- > SO, if this sounds familiar, please tell me what you did to solve it...
- >
- > Thanks,
- > Justin York
- > jyork@iastate.edu
-
- Here is some documentation that may help you. I've kept this around
- for ever, I hope the information is not out of date.
-
- $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
-
- Actually, green is meaningful in the right context. On initial powerup, the
- first meaningful color displayed is dark grey, which indicates the system
- has passed the "hardware test". The 68000 is running, and some hardware
- registers are seen. Next is the light grey screen, the "software test",
- where the system software is starting to come up. Finally, the "white"
- screen comes up indicating that the machine is just about ready to ask for
- a disk everything has checked out OK.
-
- Failures come up as colors. Green indicates a CHIP RAM failure of some kind.
- Red indicates a ROM/WCS failure. Blue indicates a custom chip failure.
- And yellow indicates that a 68000 exception trap has occurred before the
- normal OS trap handler (the GURU code) has been installed. When a failure
- is detected, the OS will often retry, so you can see cycling from failure to
- test, at least for the right kind of failures.
-
- Dark gray Ok Hardware
- Light gray Ok Software
- Red Bad ROM Checksum
- Green Bad RAM
- Blue Bad Custom Chips
- Yellow Exception
-
- >What does the Amiga do when you reboot?
-
- This should be in the 'most asked questions' posting, along with
- "what does color X mean on startup?"
-
- - Clear Chips (screen turns blue on custom chip failure)
- - Disable DMA and Interrupts
- - Clear the Screen
- - Check the Hardware
- - Pass or fail the Hardware to the Screen (dark grey if OK)
- - Checksum the WCS (OS does not checksum the ROM)
- - Pass or fail the WCS to the Screen (displays "Insert Kickstart" screen)
- - System setup
- - Check the for RAM at $C00000
- - Move SYS_BASE to $C00000 if it exists
- - RAM Test
- - Pass or fail the RAM to the Screen (green if bad)
- - Check the Software
- - Pass or fail the Software to the Screen (light grey if OK)
- - Set up the RAM
- - Link the Libraries
- - Find External RAM and link it to the list
- - Set up Interrupts and DMA
- - Start default Task
- - Check for 68010, 68020, and 68881
- - Check for an Exception (screen yellow if found and GURU handler not set up)
- - System Reset
-
-
- The Keyboard has it's own processor, RAM and ROM. A selftest is
- peformed on power-up in the following sequence.
-
- 1. Performs checksum on ROM's
- 2. Checks 64 bytes of RAM.
- 3. The timer is tested.
- 4. Performs handshake with computer and gives results of selftest.
-
- If the keyboard does not pass the test it will notify you that it is
- not working properly. This information is indicated with the blinking
- of the CAPS-LOCK light.
-
- One Blink Keyboard ROM check failed.
-
- Two Blinks Keyboard RAM checked failed.
-
- Three Blinks Watchdog timer failed
-
- Four Blinks A short between two row lines or special control keys.
-
- $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
-
- --
- Regards,
-
- Russ Forster (postmaster), Sr. Technical Analyst, MultiVendor Group
- BC Systems Corp., 4000 Seymour Place, Victoria, B.C., V8X 4S8
- Internet: RForster@Galaxy.Gov.BC.CA Phone: (604) 389-3186
-