PCN-1098 (Neologue Electronics (now PC technology)) Digital I / O board for C bus. Two μPD8255AC-5 mounted, byte unit (8 bits) 6-bit 8-bit parallel port for word input / output (16 bits) Power can use 3 16-bit ports.Supply current is +5 V, 160 mA (TYP), but Without the optional buffer (SN74LS245).Operating temperature 0 to 35 °.The connector is Two 34-pin males, CN1 (corresponds to "AL") and CN2 (corresponds to "AH") on the board.Fit Connectors are Yamaichi FAS-34-03B or equivalent.4 stations dip switch on the board There is one and one 8-link jumper switch. The address configuration is as follows: (MBS) (LBS) 　A7-A6-A5-A4-A3-A2-A1-A0 　A7: System code (always 1) 　A6 to A3: Device number (set by dip switch) 　A2 to A0: Order code Order code: Below, A2-A1-A0 ■ Port and register name ■ Designation of μPD8255 AC-5 ■ Order of connector 0-0- 0 ■ A port ■ AL ■ CN1 0-0-1 A port AH CN2 0-1-0 B port AL CN 1 0-1-1 B port AH CN2 1-0-0 ■ C port AL AL CN CN1 1-0-1 C port AH CN2 1-1-0 ■ Control register ■ AL ■ CN1 1-1-1 ■ Control register ■ AH ■ CN2 I / O operation 1. 8-bit input / output 　 Set the control word of the μPD8255 AC-5 separately on the AL and AH sides. 2. 16-bit input / output 16-bit data is high-order (D15 to D8) and μ-side on μPD8255AC-5 on the AH side. 　 It is divided and output to the μPD8255AC-5 in the lower order (D7 to D0).Therefore, μPD8255AC-5 　 Set the same control word on AL and AH side. The following is the order of the 16-bit port name ■ upper (CN 2) ■ lower (CN 1) 　 A 16-bit port AH A port AL A port 　 B 16-bit port AH B port AL B port 　 C 16-bit port AH C port AL C port Other combinations are not allowed for 16-bit ports. ・ 4 stations dip switch SW: I / O address setting 　OFF-OFF-OFF-OFF: 80H ~ 87H 　OFF-OFF-OFF-ON: 88H-8FH 　OFF-OFF-ON-OFF: 90H to 97H 　OFF-OFF-ON-ON: 98H to 9FH 　OFF-ON-OFF-OFF: A0H to A7H 　OFF-ON-OFF-ON: A8H to AFH 　OFF-ON-ON-OFF: B0H to B7H 　OFF-ON-ON-ON: B8H to BFH 　ON-OFF-OFF-OFF: C0H to C7H 　ON-OFF-OFF-ON: C8H to CFH 　ON-OFF-ON-OFF: D0H to D7H 　ON-OFF-ON-ON: D8H to DFH Normally set to any of D0H to D7H and D8H to DFH. ・ 8 series jumper switch J1: setting of interrupt level _________ | | INT 4 ----- --------- · ------ + ------ INTR A (CN 1, 33 pins) INT 5 ---- + -------------------- INT 6-+-| -------------------- 　　　 | | | | ・ ・ | |　　 　　　 | | | | ・ ・ | | | |----------+--------INTR B (CN2, 33 pins) --------------+ 　　　 ------------------ 　　　　　　　　| | 　　　　　　 ~~~~~~~~ Buffer area (optional) A buffer area is provided between each port and connector of the μPD8255AC-5. If you need a buffer, implement the SN74LS245.The SN74LS245 is bi-directional It can not be either input or output. The following is the specification of μPD8255 AC-5 ■ Port name ■ Buffer area name ■ Pull-up module Resistance ■ Cut pattern name (solder side) ■ Order of ceramic capacitor mounting position AL A RA 1 JV 4, JG 4 RM 1 RA 1 C 7 AL B 1 RB 1 JV 5, JG 5 RM 2 RB 1 C 8 AL C RC 1 JV 6 JG 6 RM 3 RC 1 C 9 AH, A, RA2, JV1, JG1, RM4, RA2, C10 AH B B RB 2 JV 2, JG 2 RM 5 RB 2 C 11 AH C C RC 2 JV 3, JG 3 RM 6 RC 2 C 12 Implementation method of SN74LS245: (1) Remove the pull-up module resistance of the port requiring the buffer.Nipper 　 Use a solder wicker or cut off the leg with a hand. (2) Cut the pattern on the solder side of the buffer area where the buffer is to be mounted. The pattern cut is the eight patterns inside the square marked CUT on the solder surface. (3) Implement the SN74LS245.After confirming the direction of the IC, soldering. (4) Determine the SN74LS245 input / output direction.JV corresponding to each buffer area or 　 Jump on JG. 　 Jumper JV: Output only 　 Jumper JG: input only (5) A 0.01 μF or 0.1 μF ceramic capacitor is mounted where the buffer is mounted. ID 1 GND 2 GND 3 port A0 4 port A1 5 port A2 6 port A3 7 port A4 8 port A5 9 port A6 10 port A7 11 GND 12 GND 13 port B0 14 port B1 15 port B2 16 port B3 17 port B4 18 port B5 19 port B6 20 port B7 21 GND 22 GND 23 port C0 24 port C1 25 port C2 26 port C3 27 port C4 28 port C5 29 port C6 30 port C7 31 GND 32 GND 33 INTR A (CN1) / INTR B (CN2) 34 NC