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INT 11 - EQUIPMENT DETERMINATION
Return: AX = equipment flag bits
            0     diskette installed
            1     8087 present
            2     mouse installed (PS2 only)
            2,3   number of 16K banks of RAM on motherboard (PC only)
                  number of 64K banks of RAM on motherboard (XT only)
                  always = 11 on AT and above
            4,5   initial video mode
                  01 = 40x25 color
                  10 = 80x25 color
                  11 = 80X25 IBM monochrome
            6,7   number of diskette drives (only if bit 0 = 1)
                  00 = 1, 01 = 2, 10 = 3, 11 = 4
            8     0 = DMA present
                  1 = no DMA on system (PCjr, some Tandy 1000s, 1400LT)
            9-11  number of RS232 cards
            12    game I/O attached
            13    serial printer installed (PCjr)
                  internal modem installed (PC/Convertible)
            14,15 number of printers
---Compaq and many other 386/486 machines--
        EAX bit 23: page tables set so that Weitek coprocessor addressable in
                        real mode
            bit 24: Weitek math coprocessor present
---Compaq Systempro
        EAX bit 25: internal DMA parallel port available
                26: IRQ for internal DMA parallel port (if bit 25 set)
                    0 = IRQ5
                    1 = IRQ7
             27,28: parallel port DMA channel
                    00 DMA channel 0
                    01 DMA channel 0 ???
                    10 reserved
                    11 DMA channel 3
SeeAlso: INT 12