WD33C93, WD33C93A used in Commodore and Amiga equipment
- IC number
- WD33C93, WD33C93A
- IC function
- SCSI Bus Interface Controller
- Related components
- NCR53C710 (SCSI-II controller)
| IC number | Manufacturer | Documentation |
|---|---|---|
| WD33C93, WD33C93A |  | A590 system schematics |
| Component | Package | CBM part number | CBM part description |
|---|---|---|---|
| WD33C93-PL | 40-Pin DIP | 390206-01 | WD33C93 |
| WD33C93A-PL | 40-Pin DIP | 390206-03 | WD33C93A |
| Device | Position | Component | Package |
|---|---|---|---|
| A3000 | U800 | WD33C93 | DIP |
| A3000T | U800 | WD33C93A | DIP |
| A2090 | U49 | WD33C93 | DIP |
| A2090A | U49 | WD33C93 | DIP |
| A2091 | U4 | WD33C93 | DIP |
| A590 | U4 | WD33C93 | DIP |
| Pin | Type | Function group | Name | Signal name | ||
|---|---|---|---|---|---|---|
| A3000, A3000T | A2090, A2090A | A2091, A590 | ||||
| 1 | I/O | SCSI interface | I/O | Connected to pin 50 of internal SCSI connector and pin 20 of external SCSI connector | ||
| 2 | I/O | SCSI interface | _MSG | Connected to pin 42 of internal SCSI connector and pin 2 of external SCSI connector | ||
| 3 | Power | Miscellaneous | VSS | GND | ||
| 4 | I/O | SCSI interface | _C/D | Connected to pin 46 of internal SCSI connector and pin 15 of external SCSI connector | ||
| 5 | I/O | SCSI interface | _BSY | Connected to pin 36 of internal SCSI connector and pin 6 of external SCSI connector | ||
| 6 | I/O | SCSI interface | _SEL | Connected to pin 44 of internal SCSI connector and pin 19 of external SCSI connector | ||
| 7 | Input | Processor/DMA interface | CLK | 14M | _7M | 7M |
| 8 | I/O | Processor/DMA interface | _DRQ/DRQ | _DREQ | _DRQ | _SDREQ |
| 9 | I/O | Processor/DMA interface | _DACK/_RCS | _DACK | _SDACK | |
| 10 | Output | Processor/DMA interface | INTRQ | INTS | _INTP via U6 | INTS |
| 11..18 | I/O | Processor/DMA interface | D0..D7 | Connected to PD0..PD7 of Super DMAC | HD0..HD7 | SD0..SD7 |
| 19 | Input | Processor/DMA interface | A0 | A(1) | SA0 | SA(1) |
| 20 | Power | Miscellaneous | VSS | GND | ||
| 21 | Input | Processor/DMA interface | _CS | _CSS | ||
| 22 | I/O | Processor/DMA interface | _WE | _IOW | _WE | _IOW |
| 23 | I/O | Processor/DMA interface | _RE | _IOR | _RE | _IOR |
| 24 | Input | Processor/DMA interface | ALE | GND | ||
| 25 | I/O | SCSI interface | _DBP | Connected to pin 18 of internal SCSI connector and pin 20 of external SCSI connector | ||
| 26..27 | I/O | SCSI interface | _DB0.._DB1 | Connected to pins 2,4 of internal SCSI connector and pins 8,21 of external SCSI connector | ||
| 28 | Power | Miscellaneous | VSS | GND | ||
| 29..34 | I/O | SCSI interface | _DB2.._DB7 | Connected to pins 6,8,10,12,14,16 of internal SCSI connector and pins 22,10,23,11,12,13 of external SCSI connector | ||
| 35 | Power | Miscellaneous | VSS | GND | ||
| 36 | Input | Processor/DMA interface | _MR | _IORST | _MRESET | _RESET |
| 37 | I/O | SCSI interface | _ATN | Connected to pin 32 of internal SCSI connector and pin 17 of external SCSI connector | ||
| 38 | I/O | SCSI interface | _ACK | Connected to pin 38 of internal SCSI connector and pin 5 of external SCSI connector | ||
| 39 | I/O | SCSI interface | _REQ | Connected to pin 48 of internal SCSI connector and pin 1 of external SCSI connector | ||
| 40 | Power | Miscellaneous | VCC | +5V | VCC | |
- On the A590 SA(1) is buffered using U10, the resulting signal is called BUFRD_A1
Copyright © 2003-2004 Ronald van Dijk - All rights reserved
Last update: 4 January 2004