DEBUGGER-4

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

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

CV-43L DEBUGGER-4 

Function Description:

* CV-43L is the development of DEBUGGER-3-4 CARD model: CV-36, 37, 38,

40L, 41L, 42L.

* Most functions same as CV-43 addition;

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

(2) Latch function: Can use ADDR(ADDRESS), D0-7(DATA), IOW, IOR, MEMR,

MEMW, AEN(H/L), AEN(DISABLE/ENABLE) setup to latch, also can execute step by

step function after latch.

A. Latch function: can use two DEBUGGERs to compare signals for motherboard repair;

1. One install in good motehr board, another to bad board, after power on two motherboards will latch at the same borken point;

2. After latch, measure motherboard'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.

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

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

B. Latch function to ADD_ON card debug:

1. Connect ADD_ON card's D-SUB connector to RS-232 TESTER or CHECK TESTER.

2. Setup I/O PORT address.

3. Run read/write command, or execute test program, after latch compare data code of

CV-43L and ADD_ON card, will know ADD_ON card decode circuit and data

read/write circuit correct or not.

C. Latch function to Software debug:

1. Setup debug address.

2. After latch to execute step by step function, will know ADDRESS, DATA correct .or not.

CV-44L DEBUGGER-4 

* All functions, operations, testing same as CV-43L.

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

easy view.

CV-45L DEBUGGER-4 

* All functions, operations, testing same as CV-43L.

* 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: 04.01.2011