Home  Back
Last update: 10 January 2004

IC number:6526 / 8521 ¹
IC function:CIA (Complex Interface Adapter)
Related components:8520 (successor)
¹ Many times a 8521 is actually marked 6526. When this is the case, the code 216A will also be printed on the component.

Component documentation
IC numberManufacturerDocumentation
6526, 8521MOS Technology / CSGNot available

Component versions
IC numberPackageSpeedCBM part numberCBM part description
MCS652640-Pin Ceramic DIP1 MHz906108-016526
MPS652640-Pin Plastic DIP1 MHz
MCS6526A40-Pin Ceramic DIP2 MHz906108-026526A
MPS6526A40-Pin Plastic DIP2 MHz

Positions
DevicePositionsPackageSpeed
C64U1, U2DIP1 MHz
C64CU1, U2DIP1 MHz
SX 64 I/O boardUB2, UB3DIP2 MHz
C128U1, U4DIP1 MHz
C128D CRU1, U4DIP1 MHz
CBM II lo-profileU1DIP2 MHz
CBM II hi-profileU11DIP2 MHz
1571U20DIP2 MHz

Pinout
PinTypeNameSignal name
C64 U1, C64C U1, SX 64 I/O board UB3, C128 U1, C128D CR U1C64 U2, C64C U2, SX 64 I/O board UB2, C128 U4, C128D CR U4CBM II lo-profile, CBM II hi-profile1571
1PowerVSSGNDGNDGND
2I/OPA0COL0 (JOYB0)VAI4_connected to P1 and U3unused
3I/OPA1COL1 (JOYB1)VAI5_connected to P1 and U3unused
4I/OPA2COL2 (JOYB2)PA2connected to P1 and U3unused
5I/OPA3COL3 (JOYB3)ATN_OUTconnected to P1 and U3unused
6I/OPA4COL4CLK_OUTconnected to P1 and U3unused
7I/OPA5COL5DATA_OUTconnected to P1 and U3unused
8I/OPA6COL6CLKconnected to P1 and U3unused
9I/OPA7COL7DATAconnected to P1 and U3unused
10I/OPB0ROW0 (JOYA0)PB0connected to P1unused
11I/OPB1ROW1 (JOYA1)PB1connected to P1unused
12I/OPB2ROW2 (JOYA2)PB2connected to P1unused
13I/OPB3ROW3 (JOYA3)PB3connected to P1unused
14I/OPB4ROW4 (BTNA/LP)PB4connected to P1unused
15I/OPB5ROW5PB5connected to P1unused
16I/OPB6ROW6PB6connected to P1unused
17I/OPB7ROW7PB7connected to P1unused
18OutputPCunusedPC2_connected to P1unused
19InputTOD60HzTODCLKunused
20PowerVCC+5+5V+5
21OutputIRQ_IRQ_NMI_CIAIRQ__IRQ
22InputR/WR/W_SR/W_R/_W
23InputCS_CIA1_CIA2_CIACS_connected to U5
24InputFLAG_CASS_RD (SRQ_IN_)FLAG2_CASREADunused
25InputØ2Ø2SØ2PHI_2
26..33I/ODB7..DB0D7..D0BD7..BD0D7..D0
34InputRES_RESET_RES__RES
35..38InputRS3..RS0A3..A0BA3..BA0A3...A0
39I/OSPSP1SP2connected to P1connected to U19
40I/OCNTCNT1CNT2connected to P1connected to U19

Copyright © 2003-2004 Ronald van Dijk - All rights reserved