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- POST - INITIAL RELIABILITY TESTS
-
- TEST.01
- 80286 PROCESSOR TEST (REAL MODE)
- Description
- Verify Flags, Registers, and Conditional Jumps.
- Check for Processor ShutDown (0 to A)
- SHUT0:
-
- TEST.02
- ROM CHECKSUM TEST 1
- Description
- A Checksum is done for the 32K ROM modules (two)
- containing POST, BASIC and BIOS.
-
- TEST.03
- VERIFY CMOS SHUTDOWN BYTE
- Description
- Rolling Bit Written and Verified at Shutdown address.
-
- TEST.04
- 8254 CHECK TIMER 1 ALL BITS ON
- Description
- Set Timer Count
- Check that Timer 1 all bits on
-
- TEST.05
- 8254 CHECK TIMER 1 ALL BITS OFF
- Description
- Set Timer Count
- Check that Timer 1 all bits off.
-
- TEST.06
- 8237 DMA 0 INITIALIZATION
- CHANNEL REGISTER TEST
- Description
- Disable the 8237 DMA Controller 0.
- Write/Read the current DMA 0 address and Word Count Redisters
- for all channels.
-
- TEST.07
- 8237 DMA 1 INITIALIZATION
- CHANNEL REGISTER TEST
- Description
- Disable the 8237 DMA Controller 1.
- Write/Read the current DMA 1 address and Word Count Redisters
- for all channels.
-
- TSET.08
- DMA PAGE REGISTER TEST
- Description
- Write/Read all Page Registers.
-
- TSET.09
- STORAGE REFRESH TEST
- Description
- Verify Refresh is occurring.
-
- TEST.10
- 8042 INTERFACE TEST
- READ CONFIGURATION JUMPERS
- Description
- Isuue a self test to the 8042.
- Insure a 55H is received.
- Read Manufacturing and Display Jumpers and Save in MFG_TEST.
-
- TEST.11
- BASE 64K READ/WRITE MEMORY TEST
- Description
- Write/Read/Verify data patterns AA, 55, FF, 01, and 00
- to 1st 64K of storage. Verify storage Addressability.
-
- TEST.11A
- VERIFY 286 LGDT/SGDT/LIDT/SIDT INSTRUCTIONS
- Description
- Load GDT and IDT Registers with AA, 55, 00 and Verify correct.
-
- TEST.12
- VERIFY CMOS CHECKSUM/BATTERY OK
- Description
- Determine if Config Record can be used for initialization.
-
- TEST.13
- PROTECTED MODE TEST AND MEMORY SIZE DETERMINE (0 --> 640K)
- Description
- This Routine runs in Protected Mode in order to address all of
- storage. It checks the Machine Status Word (MSW) for Protected Mode
- and the Base Memory Size is determined and saved. Bit 4 of the CMOS
- Diagnostic Status Byte is set if 512K --> 640K memory is installed.
- During a Power Up sequence the Memory Size determine is done with
- Plannar and I/O Parity Checks Disabled. During a Soft RESET the
- Memory Size Determine will check for Parity Errors.
- SHUT8:
-
- TEST.13A
- PROTECTED MODE TEST AND MEMORY SIZE DETERMINE (ABOVE 1024K)
- Description
- This routine runs in Protected Mode to address above 1M.
- The Memory Size is Determined and Saved in CMOS.
- During a Power Up sequence the Memory Size determine is done with
- Plannar and I/O Parity Checks Disabled. During a Soft RESET the
- Memory Size Determine will check for Parity Errors.
- SHUT1:
-
- TEST.14
- INITIALIZE AND START CRT CONTROLLER (6845)
- TEST VIDEO READ/WRITE STORAGE
- Description
- Reset the Video Enable Signal.
- Select Alphanumeric Mode, 40 * 25, B & W.
- Read/Write Data Patterns to memory. Check Storage Addressability.
- ERROR = 1 Long and 2 Short Beeps
-
- TEST.15
- SETUP VIDEO DATA ON SCREEN FOR VIDEO LINE TEST
- Description
- Enable Video Signal and Set Mode, Display a horizontal bar on screen.
-
- TEST.16
- CRT INTERFACE LINES TEST
- Description
- Sense ON/OFF Transition of the Video Enable and
- Horizontal SYNC Lines.
-
- TEST.17
- 8259 INTERRUPT CONTROLLER TEST
- Description
- Read/Write the Interrupt Mask Register (IMR) with all ones and zeros.
- Enable System Interrupt. Mask Device Interrupts Off.
- Check for Hot Interrupts (Unexpected).
-
- TEST.18
- 8254 TIMER CHECKOUT
- Description
- Verify that the System Timer (0) doesn't count too fast or too slow.
-
- TEST.19
- ADDITIONAL READ/WRITE STORAGE TEST (MUST RUN IN PROTECTED MODE)
- Description
- Write/Read Data Patterns to any Read/Write Storage after the 1st 64K.
- Storage Addressability is checked.
-
- SHUT3: Memory Error Reporting (R/W Memroy or Parity Errors)
-
- TEST.20
- ADDITIONAL PROTECTED (VIRTUAL MODE) TEST
- Description
- The Processor is put in Protected Mode and the following functions
- are verified
-
- 1.Verify Protected Mode
- The Machine Status is check for Virtual Mode.
- 2.Programmed Interrupt Test
- An Programmed Interrupt 32 is issued and verified.
- 3.Exception Interrupt 13 Test
- A Descriptor Segment Limit is set to zero and a write to that
- Segment is attempted and Exception 13 is expected and verified.
- 4.LDT/SDT LTR/STR Test
- Load LDT Register and Verify correct.
- Load TASK Register and Verify correct.
- They are verified via the STORE Instruction.
- 5.The Control Flags of the 286 for Direction are verified via the
- STD and CLD Commands in Protected Mode.
- 6.BOUND Instruction Test (Exception INT 5)
- Create a Signed Array Index within and outside the limits.
- Check that no EXC INT if within limit and that and EXC INT 5 occurs
- if outside the limits.
- 7.PUSH ALL POP ALL Test
- Set General Purpose Registers to different values, issue a PUSH ALL,
- Clear the Rigisters then issue a POP ALL and verify correct.
- 8.Check the VERR/VERW Instructions
- The Access Byte is set to Read Only then to a Write Only and the
- VERR/VERW Instructions are verified.
- 9.Cause an Interrupt 13 via a Write to a Read Only Segment
- 10.Verify the ARPL Instruction Functions
- Set the RPL Field of a Selector RPL and verify that current Selector
- RPL is set correctly.
- 11.Verify the LAR Instruction Functions
- 12.Verify the LSL Instruction Functions
- 13.Low MEG Chip Select Test
-
- SHUT2:
- SHUT7:
- SHUT6:
-
- TEST.21
- KEYBOARD TEST
- Description
- Reset the Keyboard and Check that Scan Code "AA" is Returned to the
- Processor. Check for Stuck Keys.
-
- TSET.22
- CHECK FOR OPTIONAL ROM FROM C800->E000 in 2K BLOCKS
- Description
- A Valid Module has "55AA" in the first 2 locations, Length Indicator
- (Length/512) in the 3rd location, and Test/Initial Code Starting in
- the 4th location.
- <NOTE:> this routine is after the TEST.23.
-
- TEST.23
- DISKETTE ATTACHMENT TEST
- Description
- Check if IPL Diskette Drive is attached to System. If attached, verify
- Status of NEC FDC and check Status. Complete System Initialization
- then Pass Control to the Boot Loader Program.
-
- BOOTSTRAP - INT 19H
- BOOT STRAP LOADER
- Description
- Track 0, Sector 1 is Read into the Boot Location (0:7C00) and
- Controll is Transferred there.
- If there is a Hardware Error, Control is Transferred to the
- ROM BASIC entry point.
- FLOW:
- 1.Reset the Disk Parameter Table Vector (INT 1EH)
- 2.Clear @BOOT_LOCN (0:7C00)
- 3.Load System From Diskette -- CX has Retry Count 4
- 4.If read successful and Boot Record is valid,
- then go to @BOOT_LOCN (0:7C00),
- else loop 3.
- 5.Attempt Bootstrap from Fixed Disk -- CX has Retry Count 3
- 6.If read successful and Boot Record is valid,
- then go to @BOOT_LOCN (0:7C00),
- else loop 5.
- 7.INT 18H -- Go to RESIDENT BASIC
-
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