Revised : 28/9/91@20:15EST Info on DTC-5150 CRH : MFM Hard disk controller ------------------------------------------------------------------- =========== ========================= J2 J1 =========== J3 ************** ********** ** FIRMWARE ** ** BIOS ** ************** ********** J4 W2 | | W7 W1 W4 W3 W5 - -- -- -- -- 1 1 1 1 ------------------------------------------------------------------- W1 1-2 : 8k ROM 2-3 : 16k ROM W2 3-4 2-5 1-6 PROM address OUT - - disabled IN OUT OUT C800 IN OUT IN CA00 IN IN OUT D800 IN IN IN F400 If I/O = 0x320 to 0x323, only C800 or F400 allowed 0x324 to 0x327, only CA00 or D800 allowed W3,W4 Standard DMA channel :- W3: 3-2 (DACK3) W4: 1-2 (DREQ4) Alternate DMA channel :- W3: 1-2 (DACK1) W4: 3-2 (DREQ1) W5 : Interrupt selection 3-2 : IRQ5 (standard) 1-2 : IRQ2 W7 : I/O port address installed : 0x320 to 0x323 not installed : 0x324 to 0x327 === File ends