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back2root:ibm-pc-ms-dos:hardware:8272-pd765
Différences
Ci-dessous, les différences entre deux révisions de la page.
| Les deux révisions précédentesRévision précédenteProchaine révision | Révision précédente | ||
| back2root:ibm-pc-ms-dos:hardware:8272-pd765 [2023/02/23 22:22] – [Tableau] frater | back2root:ibm-pc-ms-dos:hardware:8272-pd765 [2023/02/23 22:30] (Version actuelle) – [Key to Abbreviations] frater | ||
|---|---|---|---|
| Ligne 339: | Ligne 339: | ||
| | command byte 1: | ? | | command byte 1: | ? | ||
| | returns nothing | | returns nothing | ||
| - | + | {{tablelayout? | |
| - | |Sense Interrupt\\ Status | + | ^ Sense Interrupt\\ Status |
| - | |command byte 0: | 0 |0 | 0| 0 | 1 |0 | 0| 0 | + | | command byte 0: |
| - | |result byte 0: |status register 0 | + | | result byte 0: | status register 0 |||||||| |
| - | |result byte 1: |present cylinder number | + | | result byte 1: | present cylinder number |
| {{tablelayout? | {{tablelayout? | ||
| ^ Specify Step & \\ Head Load ^ D7 ^ D6 ^ D5 ^ D4 ^ D3 ^ D2 ^ D1 ^ D0 ^ | ^ Specify Step & \\ Head Load ^ D7 ^ D6 ^ D5 ^ D4 ^ D3 ^ D2 ^ D1 ^ D0 ^ | ||
| Ligne 350: | Ligne 350: | ||
| | command byte 2: | ------head load time------ ND | | command byte 2: | ------head load time------ ND | ||
| | returns nothing | | returns nothing | ||
| - | + | {{tablelayout? | |
| - | |Sense Drive\\ Status | + | ^ Sense Drive\\ Status |
| - | |command byte 0: | 0 |0 | 0 |0 | 0 |1 | 0 | 0 | + | | command byte 0: |
| - | |command byte 1: | ? |? | ?| ? | ? | HD | US1| US0 | | + | | command byte 1: |
| - | |result byte 0: |status register 3 | + | | result byte 0: | status register 3 |||||||| |
| {{tablelayout? | {{tablelayout? | ||
| ^ Seek | ^ Seek | ||
| Ligne 369: | Ligne 369: | ||
| |Invalid Command | |Invalid Command | ||
| |result byte 0: | |result byte 0: | ||
| + | |||
| + | === Key to Abbreviations === | ||
| + | {{tablelayout? | ||
| + | ^ HD | Head Number Selected | ||
| + | ^ MT | Multi-Track | ||
| + | ^ MF | MFM mode | | ||
| + | ^ ND | Non-DMA mode | | ||
| + | ^ SK | SKip Deleted-data address mark | | ||
| + | ^ US0 | drive select bit 0 | | ||
| + | ^ US1 | drive select bit 1 | | ||
| + | |||
| + | * Head Load Time = 2 to 254ms in 2ms increments | ||
| + | * Head Unload Time = 16 to 240ms in 16ms increments | ||
| + | * Step Rate Time = 1 to 16ms in 1ms increments | ||
| + | |||
| <WRAP round box> | <WRAP round box> | ||
| * PS/2 systems use the 8272A diskette controller which is software and port compatible with the NEC µPD765 | * PS/2 systems use the 8272A diskette controller which is software and port compatible with the NEC µPD765 | ||
| - | * accessed through ports 3F0h-3F7h; NEC µPD765 is accessed through ports 3F2h, 3F4h and 3F5h; the 8272A uses ports 3F0h, 3F1h, 3F2h, 3F4h, 3F5h and 3F7h | + | * accessed through ports 3F0h-3F7h;\\ NEC µPD765 is accessed through ports 3F2h, 3F4h and 3F5h;\\ the 8272A uses ports 3F0h, 3F1h, 3F2h, 3F4h, 3F5h and 3F7h |
| * data, command and status registers are all accessed through port 3F5h a register stack with one address presented to the bus | * data, command and status registers are all accessed through port 3F5h a register stack with one address presented to the bus | ||
| * bit 7 of BIOS Data Area byte 40:3E can be polled to determine if a disk operation has completed; this bit is set by the interrupt handler when the operation has completed; it should be reset before continuing on with the next FDC operation | * bit 7 of BIOS Data Area byte 40:3E can be polled to determine if a disk operation has completed; this bit is set by the interrupt handler when the operation has completed; it should be reset before continuing on with the next FDC operation | ||
| Ligne 378: | Ligne 393: | ||
| * see [[back2root: | * see [[back2root: | ||
| - | * see [[back2root: | + | * see [[back2root: |
back2root/ibm-pc-ms-dos/hardware/8272-pd765.1677187343.txt.gz · Dernière modification : 2023/02/23 22:22 de frater
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