DEBUGGER-4

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

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

CV-40L DEBUGGER-4 

Function Description:

* CV-40L is the development of DEBUGGER-3 CARD model: CV-31, 32, 33.

* Most functions same as CV-40 addition;

(1) Auto step by step(trace) function.

(2) Latch function: can use two DEBUGGERs to compare signals for mother board repair;

A. One install in good motehr board, another to bad board, after power on two mother

boards will latch at the same borken point;

B. After latch, measure mother board's circuit signals by OSCILLOSCOPE, will find all

HIGH-LEVEL, LOW-LEVEL signals except CLK, these are great helpful for you to

compare exactly with every circuit signals, and to know OPEN/SHORT or not.

C. After latch, change two DEBUGGERs to execute step by step function, and compare

value of ADDRESS and DATA, will know open/short or not.

(3) Addition one I/O PORT 80H-8FH decode:

A. In I/O PORT 80H-8FH address with IOW, IOR signals can run 8bit data LATCH

function, after latch can do step by step function again.

B. Software debug, use DEBUGGER card I/O PORT 80H-8FH for check point display,

can write value to DEBUGGER, or or read value from DEBUGGER, no need interrupt

program execution.

CV-41L DEBUGGER-4 

* All functions, operations, testing same as CV-40L.

* Difference: DIGITs display ADDRESS BUS and DATA BUS codes in hexadecimal for

easy view.

CV-42L DEBUGGER-4 

* All functions, operations, testing same as CV-40L.

* Difference: With LED and DIGITs synchronous display ADDRESS BUS and DATA 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.-

Start: 23/04/1998 Update: 09.29.2009