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SuperMax |
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Сообщение
#1
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![]() Администратор ![]() ![]() ![]() ![]() ![]() Группа: Root Admin Сообщений: 6 286 Регистрация: 7.1.2006 Из: Красноярск Пользователь №: 1 ![]() |
Какие разъемы бывают: внешние ![]() The SCSI standard can be divided into SCSI1, SCSI2, SCSI wide and so on. SCSI advantages includes flexible device attachment (up to 7-15 devices per SCSI bus), support for almost any peripheral type (disk, tape, CDROM, scanner etc), greater speed. All SCSI commands can overlap with commands on other devices. SCSI is widely used in servers, but due to it cost less used in end-user computers (ATA devices are cheaper and offer comparable perfomance).
Ultra3 features the same base frequency as Ultra2 (40MHz) but transmits 2 bytes per data clock thus doubling the total throughput. This is the same technique used in SDRAM, DDR and RAMBUS Memory where one data word (8 or 16 Bits) is transmitted at the raising edge and one at the falling edge. Ultra4 doubles the base frequency of Ultra2 (80MHz) and like U3 transmits 2 bytes per data clock thus doubling the total throughput vs U3. Ultra4 also features AAF (Adjustable Active Filter), QAS (Quick Arbitration and Selection). This enables these fast speeds at these long cable lengths and decreases the overall latencies due to the protocol overhead. Fast-Wide SCSI is actually SCSI-2, however many cable manufacturers refer to the 68-pin plugs as SCSI-3.
-------------------- Живы будем - Не помрем !
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SuperMax |
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Сообщение
#2
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![]() Администратор ![]() ![]() ![]() ![]() ![]() Группа: Root Admin Сообщений: 6 286 Регистрация: 7.1.2006 Из: Красноярск Пользователь №: 1 ![]() |
Соответствие внутреннего IDC 50 pin и внешнего DB25
![]() Код 25 PIN D-SUB MALE to the Amiga/Mac. 50 PIN HI-DENSITY D-SUB MALE to the peripheral. DSub HiDSub Request 1 49 Message 2 46 Input/Output 3 50 Reset 4 45 Acknowledge 5 44 Busy 6 43 Data Bus 0 8 26 Data Bus 3 10 29 Data Bus 5 11 31 Data Bus 6 12 32 Data Bus 7 13 33 Control/Data 15 48 Attention 17 41 Select 19 47 Data Parity 20 34 Data Bus 1 21 27 Data Bus 2 22 28 Data Bus 4 23 30 Term. Power 25 38 Note: All the other pins (7+9+14+16+18+24) at the DSub should be connected to pins 1-25 at the Hi-density D-Sub connector. Код D-Sub Hi D-Sub IDC Reqest 1 49 48 Message 2 46 42 I/O 3 50 50 Reset 4 45 40 Acknowledge 5 44 38 Busy 6 43 36 D0 8 26 2 D3 10 29 8 D5 11 31 12 D6 12 32 14 D7 13 33 16 Control/Data 15 48 46 Attention 17 41 32 Select 19 47 44 Data Parity 20 34 18 D1 21 27 4 D2 22 28 6 D4 23 30 10 Term Power 25 38 26 Gnd 7,9,14,16,18,24 1-25 25 ![]() Note: All the other pins (7+9+14+16+18+24) at the DSub should be connected to the all odd pins except 25 at the IDC connector. -------------------- Живы будем - Не помрем !
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SuperMax |
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Сообщение
#3
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![]() Администратор ![]() ![]() ![]() ![]() ![]() Группа: Root Admin Сообщений: 6 286 Регистрация: 7.1.2006 Из: Красноярск Пользователь №: 1 ![]() |
DB25 и Hi D-sub
![]() Note: All the other pins (7+9+14+16+18+24) at the DSub should be connected to pins 1-25 at the Hi-density D-Sub connector. -------------------- Живы будем - Не помрем !
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