DEBUGGER-4

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

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

CV-40 DEBUGGER-4 

Function Description:

* CV-40 is the development of DEBUGGER-2 CARD model: CV-25, 26, 27.

* Suitable for PC 286/386/486/586/PII/PIII... compatible system.

* LED inductor: RST(RESET DRV), RDY(I/O CHECK READY), MEMR, MEMW, IOR,

IOW, +5V, -5V, +12V, -12V.

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

(1) DIGITs display for hexadecimal.

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

(3) Setup AEN signal HIGH/LOW or ENABLE/DISABLE.

A. Hardware Debug:

Read BIOS check point value, compare with BIOS ERROR CODE MESSAGE, will

know defective position.

B. Software Debug:

Use CV-40 for CHECK POINT display, can WRITE value to it, no need to interrupt

program execution.

* Chose SL(SeLect step) for Step by step(trace) function:

Use 40pcs LED display A0-A23 ADDRESS BUS and D0-D15 DATA BUS in binary

system.

(1) When ERROR CODE display nonsense code 00 or FF, can use CV-40 to check

ADDRESS BUS and DATA BUS circuit correct or not.

(2) Can trace BIOS operation.

(3) Can check ADDRESS BUS or DATA BUS circuit open/short or not.

(4) Can check ADDRESS BUS or DATA BUS shortage with other signals or not.

(5) Will know real address when system halted.

CV-41 DEBUGGER-4 

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

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

easy view.

CV-42 DEBUGGER-4 

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

* 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