94 lines
4.0 KiB
Plaintext
94 lines
4.0 KiB
Plaintext
Amiga 'Boot' Sequence
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After getting a number of inquiries from fellow Amiga users about what's
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wrong with their Amigas when their Caplock key starts flashing, or, why
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the screen flashed odd colors, I decided to create this file.
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The Amiga goes through a rather elaborate startup sequence which is a
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series of diagnostic tests the Amiga goes through during each 'cold' or
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'warm' boot. The following is a list of what happens during each and
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every 'boot':
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1. Clear all old data in RAM
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2. Disable DMA and interrupts
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3. Clear the screen
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4. Check hardware (is the 680x0 working?)
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5. Change screen color indicating pass/fail
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6. Perform checksum test of all ROMs
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7. Change screen color indicating pass/fail
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8. Begin system startup
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9. Check RAM at $C0000..move SYSBASE there
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10. Test CHIP RAM
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11. Change screen color indicating pass/fail
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12. Check if software is coming in OK
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13. Change screen color indicating pass/fail
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14. Set up CHIP RAM to receive data
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15. Link libraries
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16. Check for any additional RAM and link it
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17. Turn on DMA and interrupts
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18. Start default task
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19. Check processor and MMU type
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20. Check for an Exception (processor error)
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21. If found, do a reset
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22. If not, normal 'boot'
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As these tests are running, the Capslock key will normally 'flash' once,
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and the screen will cycle colors. The chart below used in conjunction
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with the above steps indicates both a 'normal' and an 'abnormal' boot.
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NORMAL Fault Condition
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Sreen color:
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Dark Grey Red (indicates error in ROM)
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Light Grey Green (error in CHIP RAM)
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White Blue (error in a Custom Chip)
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Yellow (680x0 found an error)
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Capslock Key:
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Stays on for several secs One blink (ROM checksum failed)
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Two blinks (RAM test failed)
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Three blinks (Whatchdog timer)
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Four blinks (A short exists between
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2 lines or one of the
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special keys)
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Please note that the capslock 'blinks' are short in duration (about one
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second) and that your screen colors may falsely indicate a problem when
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you do a 'warm' boot depending on what state the Amiga was in before the
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warm boot. Its best to watch for these diagostic errors upon initial
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startup. If your Amiga exhibits any of these errors frequently, you should
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take it to an Authorised Service Center for service. The most common
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error you will encounter is that you'll see a bright green screen at the
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initial boot..this usually indicates that an addon RAM board is not
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seated in its socket properly. Try reseating it before you take it all to
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your dealer. You may save yourself some money;)
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X-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-X
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Another file downloaded from: NIRVANAnet(tm)
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& the Temple of the Screaming Electron Jeff Hunter 510-935-5845
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Rat Head Ratsnatcher 510-524-3649
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Burn This Flag Zardoz 408-363-9766
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realitycheck Poindexter Fortran 415-567-7043
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Lies Unlimited Mick Freen 415-583-4102
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Specializing in conversations, obscure information, high explosives,
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insane speculation, and wild rumours. ALL-TEXT BBS SYSTEMS.
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Full access for first-time callers. We don't want to know who you are,
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where you live, or what your phone number is. We are not Big Brother.
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"Raw Data for Raw Nerves"
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X-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-X
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