4-10 Troubleshooting and Repair
Table Section 4-3 Diagnostic Output and Beep Codes
Diagnostic Port Output Beep Codes Description of Test or Failure
E_MBIT EQU 16h 2-2-3 1st 64K RAM chip or data line failure - bit 6
E_MBIT EQU 17h 2-2-4 1st 64K RAM chip or data line failure - bit 7
E_MBIT EQU 18h 2-3-1 1st 64K RAM chip or data line failure - bit 8
E_MBIT EQU 19h 2-3-2 1st 64K RAM chip or data line failure - bit 9
E_MBIT EQU 1Ah 2-3-3 1st 64K RAM chip or data line failure - bit A
E_MBIT EQU 1Bh 2-3-4 1st 64K RAM chip or data line failure - bit B
E_MBIT EQU 1Ch 2-4-1 1st 64K RAM chip or data line failure - bit C
E_MBIT EQU 1Dh 2-4-2 1st 64K RAM chip or data line failure - bit D
E_MBIT EQU 1Eh 2-4-3 1st 64K RAM chip or data line failure - bit E
E_MBIT EQU 1Fh 2-4-4 1st 64K RAM chip or data line failure - bit F
E_DMAS EQU 20h 3-1-1 Slave DMA register test failure
E_DMAM EQU 21h 3-1-2 Master DMA register test failure
E_PIC0EQU 22h 3-1-3 Master interrupt mask register test failure
E_PIC1EQU 23h 3-1-4 Slave interrupt mask register test in progress or
failure
E_IVLDQU 25h * Interrupt vector loading in progress
E_KEYC EQU 27h 3-2-4 Keyboard controller test in progress or failure
E_CVER EQU 28h * CMOS power-fail and checksum checks in
progress
E_CCON EQU 29h * CMOS config info validation in progress
E_CRTM EQU 2Bh 3-3-4 Screen memory test failure
E_CRTI EQU 2Ch *
E_CRTR EQU 2Dh 3-4-1 Screen retrace tests failure
E_VROM EQU 2Eh 3-4-2 Search for video ROM in progress
E_OK EQU 30h * Screen believed operable w/video ROM
E_OK EQU 31h * Monochromatic screen believed operable
E_OK EQU 32h * 40-column color screen believed operable
E_OK EQU 33h * 80-column color screen believed operable
*No beep code.
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