* PCI card plugged into connector figure

DEBUGGER-2 for PCI bus

* Could modify BIOS port 80h(POST code decode address) to other port address,

example 80h+84h, each piece plus U$5.-

Single step function must execute immediately after Power-On,

execute on the other status, system will be halted.

CV-25P DEBUGGER-2

Function Description:

* Suitable for PC 486/586/PII/PIII... PCI-BUS compatible system.

* LED inductor: CBE0, CBE1, CBE2, CBE3, RST(RESET), FRAME, IRDY, TRDY,

VCC, GND, +12V, -12V.

* Chose "POST"(POST=Power-On-Self-Test), ERROR CODE DISPLAY:

(1) DIGITs display for hexadecimal.

(2) Offer two I/O PORT 80H and 300H check point.

A. Hardware Debug: Read BIOS check point value, compare with BIOS ERROR CODE

MESSAGE, will know defective position.

B. Software Debug: Use CV-25P for CHECK POINT display, can WRITE value to it,

no need to interrupt program execution.

* Chose "STEP" for Step by step(trace) function:

(Must connect one signal to ISA-BUS I/O channel ready, see picture)

Use 32pcs LED display PCI-BUS AD0-AD31 in binary system.

(1) When ERROR CODE display nonsense code 00 or FF, can use CV-25P to check

PCI-BUS circuit correct or not.

(2) Can trace BIOS operation.

(3) Can check PCI-BUS circuit Open Short or not.

(4) Can check PCI-BUS shortage with other signals or not.

(5) Will know real address when system halted.

Combine CBE0, CBE1, CBE2, CBE3, FRAME signals, select different BUS COMMAND,

trace different status AD-BUS signal.

CV-26P DEBUGGER-2

* All functions, operations, testing same as CV-25P.

* Difference: DIGITs display PCI AD-BUS codes in hexadecimal for easy view.

CV-27P DEBUGGER-2

* All functions, operations, testing same as CV-25P.

* Difference: With LED and DIGITs synchronous display PCI AD-BUS easier to know

all the status.

* Could modify BIOS port 80h(POST code decode address) to other port address,

example 80h+84h, each piece plus U$5.-

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Start: 21/04/1998 Update: 07.19.2013