| IC number | Manufacturer | Documentation |
|---|---|---|
| 6526, 8521 | MOS Technology / CSG | Not available |
| IC number | Package | Speed | CBM part number | CBM part description |
|---|---|---|---|---|
| MCS6526 | 40-Pin Ceramic DIP | 1 MHz | 906108-01 | 6526 |
| MPS6526 | 40-Pin Plastic DIP | 1 MHz | ||
| MCS6526A | 40-Pin Ceramic DIP | 2 MHz | 906108-02 | 6526A |
| MPS6526A | 40-Pin Plastic DIP | 2 MHz |
| Device | Positions | Package | Speed |
|---|---|---|---|
| C64 | U1, U2 | DIP | 1 MHz |
| C64C | U1, U2 | DIP | 1 MHz |
| SX 64 I/O board | UB2, UB3 | DIP | 2 MHz |
| C128 | U1, U4 | DIP | 1 MHz |
| C128D CR | U1, U4 | DIP | 1 MHz |
| CBM II lo-profile | U1 | DIP | 2 MHz |
| CBM II hi-profile | U11 | DIP | 2 MHz |
| 1571 | U20 | DIP | 2 MHz |
| Pin | Type | Name | Signal name | |||
|---|---|---|---|---|---|---|
| C64 U1, C64C U1, SX 64 I/O board UB3, C128 U1, C128D CR U1 | C64 U2, C64C U2, SX 64 I/O board UB2, C128 U4, C128D CR U4 | CBM II lo-profile, CBM II hi-profile | 1571 | |||
| 1 | Power | VSS | GND | GND | GND | |
| 2 | I/O | PA0 | COL0 (JOYB0) | VAI4_ | connected to P1 and U3 | unused |
| 3 | I/O | PA1 | COL1 (JOYB1) | VAI5_ | connected to P1 and U3 | unused |
| 4 | I/O | PA2 | COL2 (JOYB2) | PA2 | connected to P1 and U3 | unused |
| 5 | I/O | PA3 | COL3 (JOYB3) | ATN_OUT | connected to P1 and U3 | unused |
| 6 | I/O | PA4 | COL4 | CLK_OUT | connected to P1 and U3 | unused |
| 7 | I/O | PA5 | COL5 | DATA_OUT | connected to P1 and U3 | unused |
| 8 | I/O | PA6 | COL6 | CLK | connected to P1 and U3 | unused |
| 9 | I/O | PA7 | COL7 | DATA | connected to P1 and U3 | unused |
| 10 | I/O | PB0 | ROW0 (JOYA0) | PB0 | connected to P1 | unused |
| 11 | I/O | PB1 | ROW1 (JOYA1) | PB1 | connected to P1 | unused |
| 12 | I/O | PB2 | ROW2 (JOYA2) | PB2 | connected to P1 | unused |
| 13 | I/O | PB3 | ROW3 (JOYA3) | PB3 | connected to P1 | unused |
| 14 | I/O | PB4 | ROW4 (BTNA/LP) | PB4 | connected to P1 | unused |
| 15 | I/O | PB5 | ROW5 | PB5 | connected to P1 | unused |
| 16 | I/O | PB6 | ROW6 | PB6 | connected to P1 | unused |
| 17 | I/O | PB7 | ROW7 | PB7 | connected to P1 | unused |
| 18 | Output | PC | unused | PC2_ | connected to P1 | unused |
| 19 | Input | TOD | 60Hz | TODCLK | unused | |
| 20 | Power | VCC | +5 | +5V | +5 | |
| 21 | Output | IRQ_ | IRQ_ | NMI_ | CIAIRQ_ | _IRQ |
| 22 | Input | R/W | R/W_ | SR/W_ | R/_W | |
| 23 | Input | CS_ | CIA1_ | CIA2_ | CIACS_ | connected to U5 |
| 24 | Input | FLAG_ | CASS_RD (SRQ_IN_) | FLAG2_ | CASREAD | unused |
| 25 | Input | Ø2 | Ø2 | SØ2 | PHI_2 | |
| 26..33 | I/O | DB7..DB0 | D7..D0 | BD7..BD0 | D7..D0 | |
| 34 | Input | RES_ | RESET_ | RES_ | _RES | |
| 35..38 | Input | RS3..RS0 | A3..A0 | BA3..BA0 | A3...A0 | |
| 39 | I/O | SP | SP1 | SP2 | connected to P1 | connected to U19 |
| 40 | I/O | CNT | CNT1 | CNT2 | connected to P1 | connected to U19 |
Copyright © 2003-2004 Ronald van Dijk - All rights reserved
Last update: 10 January 2004