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BIOS Int 013h Extended
Hi, Ive got a diagnostic tool that runs in real mode and uses Int 013h extended functions. when i run it on a machine with AwardBIOS v4 it works fine and can catalogue all the drives with the correct parameters. but when i run it on a machine with an AwardBIOS v6 it failed, so i investigated... -
Switch OFF!
Whats wrong with my OFF switch! When ever (quite common) I get "BLUE SCREENS OF DEATH" my off switch no longer works. I used to think the OFF switch was the best part about the PC and with todays "quality" operating systems even more so! I have to resort to pulling the... -
PC Standards
Hi, I thought that the BIOS interface (ie interrupts) always have the same usage regardless of the manufacturer. I thought that the machine code for 80x86 series processors are always the same regardless of manufacture. I dont understand why my real mode program works on some PCs and not on... -
Stack Bizarre
I had a questionable idea of converting one of my modules from a 16bit code (task 32bit) to a 32bit code. Due to the nature of the specification I have to drop to real mode. The only difference in code is that I have to make a far jump to a 16bit code segment to drop to real mode before doing... -
Wheres my Burmuda Triangle Gone?
I put answer t0 div pr0blem and again it disappeared. i will replace 'o' with zer0s t0 see if that w0rks. with the div c0mmand dx is the high 0rder 0f ax. dx:ax f0rms a 32bit number. meaning that y0u can divide values greater than ax. the 0perati0n results ax h0lding the qu0tient (div) and dx... -
TASM bugs?
Hi, TASM v1.1? (definately not higher than 3 LOL) I am getting an 'Forward reference needs override' error when compiling in 32bit mode but it is ok in 16bit mode. I have something like 'fword ptr' before the pointer label. I wonder if this is a known bug and if anyone (AmkG) could point me... -
Encoding/Decoding
I was just browsing the instruction formats and encoding list for the 80x86 series chip and its a bit of a mine field. I was just wondering if anyone knew where i could locate a flowchart type diagram of the process of encoding and decoding? Its not the fact that I am lazy and cant be bothered... -
AmkG (for advanced programmers only)
AmkG, I have located a revised mnemonic list, read descriptions carefully to apreciate functionality. MNEMONIC INSTRUCTION ---------- ------------- -A- AAC Alter All Commands AAD Alter All Data AAO Add And... -
Portected mode BIOS
Does anyone know how to utilise the BIOS from protected mode. I have remapped the PICs to interrupt 20h onwards. I have written a handler which drops to real mode and calls the real mode interrupts and then back. It works a treat but when I access the drive interrupt (old 13h - new 33h) the... -
IO Port Usage Method
I have some lit on the PIC commands but nothing on the usage method. For example to recieve setup: send a control command mov al,[command code to get setup] IN 20h,al then get the 4 control words by 4 consecutive commands? OUT 20h,al is this how to do it? do you know where i can get difinitive... -
Can MOVSB work in 32bit mode?
How do you tell the processor to use 32bit when using the MOVSB opcode? It must be something really simple that i am overlooking, or MOVSB is only a 16bit opcode and the book of words is wrong. The opcode for MOVSB is 0A4h. I am tring to write from DS:ESI to ES:EDI but the previous opcode will...
