Impulse 8004e - Manual (Page 18)

Register Description
All ports are set to input after reset or power up.
Address Mode D7 D6 D5 D4 D3 D2 D1 D0
Base+0 Input Port A RD PAD7 PAD6 PAD5 PAD4 PAD3 PAD2 PAD1 PAD0
Base+1 Input Port B RD PBD7 PBD6 PBD5 PBD4 PBD3 PBD2 PBD1 PBD0
Base+2 Output Port C RD/WR PCD7 PCD6 PCD5 PCD4 PCD3 PCD2 PCD1 PCD0
Base+3 Output Port D RD/WR PDD7 PDD6 PDD5 PDD4 PDD3 PDD2 PDD1 PDD0
Base+4 RD 0 0 0 0 0 0 0 0
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