A useful accessory for video streaming or gaming, this AmazonBasics DisplayPort to HDMI Cable transmits high-definition audio and video from your computer to an HD display. More specifically, the cable directly connects any laptop or desktop computer with DisplayPort (DP, DP, or DisplayPort) to a monitor, projector, or HDTV with HDMI input. 2-meter version USB-C to Lightning Cable (1m) USB-C to 4-Port USB 3.0 Hub The new MacBook Pro comes with two or four external ports, depending on the model you pick. And the new MacBook Air has a.

• Hd Port For Macbook
• Port Mac Guitars

$ ls -al /dev

total 9

dr-xr-xr-x 3 root wheel 4372 Sep 2 12:15 .

drwxr-xr-x 32 root wheel 1156 Sep 2 12:13 ..

crw------- 1 root wheel 13, 1 Sep 2 12:15 afsc_type5

crw------- 1 root wheel 8, 0 Sep 2 12:15 auditpipe

crw-r--r-- 1 root wheel 7, 3 Sep 2 12:15 auditsessions

crw------- 1 root wheel 18, 0 Sep 2 12:15 autofs

crw------- 1 root wheel 31, 0 Sep 2 12:15 autofs_control

Hd Port For Macbook

crw-rw-rw- 1 root wheel 22, 0 Sep 2 12:15 autofs_homedirmounter

crw-rw-rw- 1 root wheel 21, 0 Sep 2 12:15 autofs_notrigger

crw-rw-rw- 1 root wheel 19, 24 Sep 2 12:15 autofs_nowait

crw------- 1 root wheel 23, 0 Sep 2 12:51 bpf0

crw------- 1 root wheel 23, 1 Sep 8 22:55 bpf1

crw------- 1 root wheel 23, 2 Sep 8 22:55 bpf2

crw------- 1 root wheel 23, 3 Sep 8 19:54 bpf3

crw------- 1 root wheel 23, 4 Sep 5 08:59 bpf4

crw------- 1 grant staff 0, 0 Sep 2 12:15 console

crw-rw-rw- 1 root wheel 17, 1 Sep 2 12:15 cu.Bluetooth-Incoming-Port

brw-r----- 1 root operator 1, 0 Sep 2 12:15 disk0

brw-r----- 1 root operator 1, 1 Sep 2 12:15 disk0s1

brw-r----- 1 root operator 1, 2 Sep 2 12:15 disk0s2

brw-r----- 1 root operator 1, 3 Sep 2 12:15 disk0s3

brw-r----- 1 root operator 1, 4 Sep 2 12:15 disk1

brw-r----- 1 root operator 1, 5 Sep 2 12:15 disk1s1

brw-r----- 1 root operator 1, 6 Sep 2 12:15 disk1s2

brw-r----- 1 root operator 1, 7 Sep 2 12:15 disk1s3

brw-r----- 1 root operator 1, 8 Sep 2 12:15 disk2

brw-r----- 1 root operator 1, 9 Sep 2 12:15 disk2s1

brw-r----- 1 root operator 1, 10 Sep 2 12:15 disk2s2

brw-r----- 1 root operator 1, 11 Sep 2 12:15 disk2s3

crw-rw-rw- 1 root wheel 24, 2 Sep 2 12:15 dtrace

crw-rw-rw- 1 root wheel 25, 0 Sep 2 12:15 dtracehelper

crw-rw-rw- 1 root wheel 0, 0 Sep 2 12:15 fbt

dr-xr-xr-x 1 root wheel 0 Sep 2 12:15 fd

crw-r--r-- 1 root wheel 10, 0 Sep 2 12:15 fsevents

crw-rw-rw- 1 root wheel 14, 16 Sep 8 23:04 io8log

cr--r--r-- 1 root wheel 14, 18 Sep 2 12:15 io8logmt

crw-rw-rw- 1 root wheel 14, 19 Sep 8 23:04 io8logtemp

crw------- 1 root wheel 6, 0 Sep 2 12:15 klog

crw-rw-rw- 1 root wheel 0, 0 Sep 2 12:15 lockstat

crw-rw-rw- 1 root wheel 0, 0 Sep 2 12:15 machtrace

crw-rw-rw- 1 root wheel 33, 0 Sep 5 16:41 nsmb0

crw-rw-rw- 1 root wheel 3, 2 Sep 8 23:04 null

crw------- 1 root wheel 9, 0 Sep 2 12:15 pf

crw------- 1 root wheel 9, 1 Sep 2 12:15 pfm

crw------- 1 root operator 20, 0 Sep 2 12:15 pmCPU

crw-rw-rw- 1 root wheel 0, 0 Sep 2 12:15 profile

crw-rw-rw- 1 root tty 15, 1 Sep 8 23:05 ptmx

crw-rw-rw- 1 root wheel 5, 0 Sep 2 12:15 ptyp0

crw-rw-rw- 1 root wheel 5, 1 Sep 2 12:15 ptyp1

crw-rw-rw- 1 root wheel 5, 2 Sep 2 12:15 ptyp2

crw-rw-rw- 1 root wheel 5, 3 Sep 2 12:15 ptyp3

crw-rw-rw- 1 root wheel 5, 4 Sep 2 12:15 ptyp4

crw-rw-rw- 1 root wheel 5, 5 Sep 2 12:15 ptyp5

crw-rw-rw- 1 root wheel 5, 6 Sep 2 12:15 ptyp6

crw-rw-rw- 1 root wheel 5, 7 Sep 2 12:15 ptyp7

crw-rw-rw- 1 root wheel 5, 8 Sep 2 12:15 ptyp8

crw-rw-rw- 1 root wheel 5, 9 Sep 2 12:15 ptyp9

crw-rw-rw- 1 root wheel 5, 10 Sep 2 12:15 ptypa

crw-rw-rw- 1 root wheel 5, 11 Sep 2 12:15 ptypb

crw-rw-rw- 1 root wheel 5, 12 Sep 2 12:15 ptypc

crw-rw-rw- 1 root wheel 5, 13 Sep 2 12:15 ptypd

crw-rw-rw- 1 root wheel 5, 14 Sep 2 12:15 ptype

crw-rw-rw- 1 root wheel 5, 15 Sep 2 12:15 ptypf

crw-rw-rw- 1 root wheel 5, 16 Sep 2 12:15 ptyq0

crw-rw-rw- 1 root wheel 5, 17 Sep 2 12:15 ptyq1

crw-rw-rw- 1 root wheel 5, 18 Sep 2 12:15 ptyq2

crw-rw-rw- 1 root wheel 5, 19 Sep 2 12:15 ptyq3

crw-rw-rw- 1 root wheel 5, 20 Sep 2 12:15 ptyq4

crw-rw-rw- 1 root wheel 5, 21 Sep 2 12:15 ptyq5

crw-rw-rw- 1 root wheel 5, 22 Sep 2 12:15 ptyq6

crw-rw-rw- 1 root wheel 5, 23 Sep 2 12:15 ptyq7

crw-rw-rw- 1 root wheel 5, 24 Sep 2 12:15 ptyq8

crw-rw-rw- 1 root wheel 5, 25 Sep 2 12:15 ptyq9

crw-rw-rw- 1 root wheel 5, 26 Sep 2 12:15 ptyqa

crw-rw-rw- 1 root wheel 5, 27 Sep 2 12:15 ptyqb

crw-rw-rw- 1 root wheel 5, 28 Sep 2 12:15 ptyqc

crw-rw-rw- 1 root wheel 5, 29 Sep 2 12:15 ptyqd

crw-rw-rw- 1 root wheel 5, 30 Sep 2 12:15 ptyqe

crw-rw-rw- 1 root wheel 5, 31 Sep 2 12:15 ptyqf

crw-rw-rw- 1 root wheel 5, 32 Sep 2 12:15 ptyr0

crw-rw-rw- 1 root wheel 5, 33 Sep 2 12:15 ptyr1

crw-rw-rw- 1 root wheel 5, 34 Sep 2 12:15 ptyr2

crw-rw-rw- 1 root wheel 5, 35 Sep 2 12:15 ptyr3

crw-rw-rw- 1 root wheel 5, 36 Sep 2 12:15 ptyr4

crw-rw-rw- 1 root wheel 5, 37 Sep 2 12:15 ptyr5

crw-rw-rw- 1 root wheel 5, 38 Sep 2 12:15 ptyr6

crw-rw-rw- 1 root wheel 5, 39 Sep 2 12:15 ptyr7

crw-rw-rw- 1 root wheel 5, 40 Sep 2 12:15 ptyr8

crw-rw-rw- 1 root wheel 5, 41 Sep 2 12:15 ptyr9

crw-rw-rw- 1 root wheel 5, 42 Sep 2 12:15 ptyra

crw-rw-rw- 1 root wheel 5, 43 Sep 2 12:15 ptyrb

crw-rw-rw- 1 root wheel 5, 44 Sep 2 12:15 ptyrc

crw-rw-rw- 1 root wheel 5, 45 Sep 2 12:15 ptyrd

crw-rw-rw- 1 root wheel 5, 46 Sep 2 12:15 ptyre

crw-rw-rw- 1 root wheel 5, 47 Sep 2 12:15 ptyrf

crw-rw-rw- 1 root wheel 5, 48 Sep 2 12:15 ptys0

crw-rw-rw- 1 root wheel 5, 49 Sep 2 12:15 ptys1

crw-rw-rw- 1 root wheel 5, 50 Sep 2 12:15 ptys2

crw-rw-rw- 1 root wheel 5, 51 Sep 2 12:15 ptys3

crw-rw-rw- 1 root wheel 5, 52 Sep 2 12:15 ptys4

crw-rw-rw- 1 root wheel 5, 53 Sep 2 12:15 ptys5

crw-rw-rw- 1 root wheel 5, 54 Sep 2 12:15 ptys6

crw-rw-rw- 1 root wheel 5, 55 Sep 2 12:15 ptys7

crw-rw-rw- 1 root wheel 5, 56 Sep 2 12:15 ptys8

crw-rw-rw- 1 root wheel 5, 57 Sep 2 12:15 ptys9

crw-rw-rw- 1 root wheel 5, 58 Sep 2 12:15 ptysa

crw-rw-rw- 1 root wheel 5, 59 Sep 2 12:15 ptysb

crw-rw-rw- 1 root wheel 5, 60 Sep 2 12:15 ptysc

crw-rw-rw- 1 root wheel 5, 61 Sep 2 12:15 ptysd

crw-rw-rw- 1 root wheel 5, 62 Sep 2 12:15 ptyse

crw-rw-rw- 1 root wheel 5, 63 Sep 2 12:15 ptysf

crw-rw-rw- 1 root wheel 5, 64 Sep 2 12:15 ptyt0

crw-rw-rw- 1 root wheel 5, 65 Sep 2 12:15 ptyt1

crw-rw-rw- 1 root wheel 5, 66 Sep 2 12:15 ptyt2

crw-rw-rw- 1 root wheel 5, 67 Sep 2 12:15 ptyt3

crw-rw-rw- 1 root wheel 5, 68 Sep 2 12:15 ptyt4

crw-rw-rw- 1 root wheel 5, 69 Sep 2 12:15 ptyt5

crw-rw-rw- 1 root wheel 5, 70 Sep 2 12:15 ptyt6

crw-rw-rw- 1 root wheel 5, 71 Sep 2 12:15 ptyt7

crw-rw-rw- 1 root wheel 5, 72 Sep 2 12:15 ptyt8

crw-rw-rw- 1 root wheel 5, 73 Sep 2 12:15 ptyt9

crw-rw-rw- 1 root wheel 5, 74 Sep 2 12:15 ptyta

crw-rw-rw- 1 root wheel 5, 75 Sep 2 12:15 ptytb

crw-rw-rw- 1 root wheel 5, 76 Sep 2 12:15 ptytc

crw-rw-rw- 1 root wheel 5, 77 Sep 2 12:15 ptytd

crw-rw-rw- 1 root wheel 5, 78 Sep 2 12:15 ptyte

crw-rw-rw- 1 root wheel 5, 79 Sep 2 12:15 ptytf

crw-rw-rw- 1 root wheel 5, 80 Sep 2 12:15 ptyu0

crw-rw-rw- 1 root wheel 5, 81 Sep 2 12:15 ptyu1

crw-rw-rw- 1 root wheel 5, 82 Sep 2 12:15 ptyu2

crw-rw-rw- 1 root wheel 5, 83 Sep 2 12:15 ptyu3

crw-rw-rw- 1 root wheel 5, 84 Sep 2 12:15 ptyu4

crw-rw-rw- 1 root wheel 5, 85 Sep 2 12:15 ptyu5

crw-rw-rw- 1 root wheel 5, 86 Sep 2 12:15 ptyu6

crw-rw-rw- 1 root wheel 5, 87 Sep 2 12:15 ptyu7

crw-rw-rw- 1 root wheel 5, 88 Sep 2 12:15 ptyu8

crw-rw-rw- 1 root wheel 5, 89 Sep 2 12:15 ptyu9

crw-rw-rw- 1 root wheel 5, 90 Sep 2 12:15 ptyua

crw-rw-rw- 1 root wheel 5, 91 Sep 2 12:15 ptyub

crw-rw-rw- 1 root wheel 5, 92 Sep 2 12:15 ptyuc

crw-rw-rw- 1 root wheel 5, 93 Sep 2 12:15 ptyud

crw-rw-rw- 1 root wheel 5, 94 Sep 2 12:15 ptyue

crw-rw-rw- 1 root wheel 5, 95 Sep 2 12:15 ptyuf

crw-rw-rw- 1 root wheel 5, 96 Sep 2 12:15 ptyv0

crw-rw-rw- 1 root wheel 5, 97 Sep 2 12:15 ptyv1

crw-rw-rw- 1 root wheel 5, 98 Sep 2 12:15 ptyv2

crw-rw-rw- 1 root wheel 5, 99 Sep 2 12:15 ptyv3

crw-rw-rw- 1 root wheel 5, 100 Sep 2 12:15 ptyv4

crw-rw-rw- 1 root wheel 5, 101 Sep 2 12:15 ptyv5

crw-rw-rw- 1 root wheel 5, 102 Sep 2 12:15 ptyv6

crw-rw-rw- 1 root wheel 5, 103 Sep 2 12:15 ptyv7

crw-rw-rw- 1 root wheel 5, 104 Sep 2 12:15 ptyv8

crw-rw-rw- 1 root wheel 5, 105 Sep 2 12:15 ptyv9

crw-rw-rw- 1 root wheel 5, 106 Sep 2 12:15 ptyva

crw-rw-rw- 1 root wheel 5, 107 Sep 2 12:15 ptyvb

crw-rw-rw- 1 root wheel 5, 108 Sep 2 12:15 ptyvc

crw-rw-rw- 1 root wheel 5, 109 Sep 2 12:15 ptyvd

crw-rw-rw- 1 root wheel 5, 110 Sep 2 12:15 ptyve

crw-rw-rw- 1 root wheel 5, 111 Sep 2 12:15 ptyvf

crw-rw-rw- 1 root wheel 5, 112 Sep 2 12:15 ptyw0

crw-rw-rw- 1 root wheel 5, 113 Sep 2 12:15 ptyw1

crw-rw-rw- 1 root wheel 5, 114 Sep 2 12:15 ptyw2

crw-rw-rw- 1 root wheel 5, 115 Sep 2 12:15 ptyw3

crw-rw-rw- 1 root wheel 5, 116 Sep 2 12:15 ptyw4

Port Mac Guitars

crw-rw-rw- 1 root wheel 5, 117 Sep 2 12:15 ptyw5

crw-rw-rw- 1 root wheel 5, 118 Sep 2 12:15 ptyw6

crw-rw-rw- 1 root wheel 5, 119 Sep 2 12:15 ptyw7

crw-rw-rw- 1 root wheel 5, 120 Sep 2 12:15 ptyw8

crw-rw-rw- 1 root wheel 5, 121 Sep 2 12:15 ptyw9

crw-rw-rw- 1 root wheel 5, 122 Sep 2 12:15 ptywa

crw-rw-rw- 1 root wheel 5, 123 Sep 2 12:15 ptywb

crw-rw-rw- 1 root wheel 5, 124 Sep 2 12:15 ptywc

crw-rw-rw- 1 root wheel 5, 125 Sep 2 12:15 ptywd

crw-rw-rw- 1 root wheel 5, 126 Sep 2 12:15 ptywe

crw-rw-rw- 1 root wheel 5, 127 Sep 2 12:15 ptywf

crw-rw-rw- 1 root wheel 11, 0 Sep 8 22:55 random

crw-r----- 1 root operator 1, 0 Sep 2 12:15 rdisk0

crw-r----- 1 root operator 1, 1 Sep 2 12:15 rdisk0s1

crw-r----- 1 root operator 1, 2 Sep 2 12:15 rdisk0s2

crw-r----- 1 root operator 1, 3 Sep 2 12:15 rdisk0s3

crw-r----- 1 root operator 1, 4 Sep 2 12:15 rdisk1

crw-r----- 1 root operator 1, 5 Sep 2 12:15 rdisk1s1

crw-r----- 1 root operator 1, 6 Sep 2 12:15 rdisk1s2

crw-r----- 1 root operator 1, 7 Sep 2 12:15 rdisk1s3

crw-r----- 1 root operator 1, 8 Sep 2 12:15 rdisk2

crw-r----- 1 root operator 1, 9 Sep 2 12:15 rdisk2s1

crw-r----- 1 root operator 1, 10 Sep 2 12:15 rdisk2s2

crw-r----- 1 root operator 1, 11 Sep 2 12:15 rdisk2s3

lr-xr-xr-x 1 root wheel 0 Sep 2 12:15 stderr -> fd/2

lr-xr-xr-x 1 root wheel 0 Sep 2 12:15 stdin -> fd/0

lr-xr-xr-x 1 root wheel 0 Sep 2 12:15 stdout -> fd/1

crw-rw-rw- 1 root wheel 0, 0 Sep 2 12:15 systrace

crw-rw-rw- 1 root wheel 2, 0 Sep 2 12:15 tty

crw-rw-rw- 1 root wheel 17, 0 Sep 2 12:15 tty.Bluetooth-Incoming-Port

crw-rw-rw- 1 root wheel 4, 0 Sep 2 12:15 ttyp0

crw-rw-rw- 1 root wheel 4, 1 Sep 2 12:15 ttyp1

crw-rw-rw- 1 root wheel 4, 2 Sep 2 12:15 ttyp2

crw-rw-rw- 1 root wheel 4, 3 Sep 2 12:15 ttyp3

crw-rw-rw- 1 root wheel 4, 4 Sep 2 12:15 ttyp4

crw-rw-rw- 1 root wheel 4, 5 Sep 2 12:15 ttyp5

crw-rw-rw- 1 root wheel 4, 6 Sep 2 12:15 ttyp6

crw-rw-rw- 1 root wheel 4, 7 Sep 2 12:15 ttyp7

crw-rw-rw- 1 root wheel 4, 8 Sep 2 12:15 ttyp8

crw-rw-rw- 1 root wheel 4, 9 Sep 2 12:15 ttyp9

crw-rw-rw- 1 root wheel 4, 10 Sep 2 12:15 ttypa

crw-rw-rw- 1 root wheel 4, 11 Sep 2 12:15 ttypb

crw-rw-rw- 1 root wheel 4, 12 Sep 2 12:15 ttypc

crw-rw-rw- 1 root wheel 4, 13 Sep 2 12:15 ttypd

crw-rw-rw- 1 root wheel 4, 14 Sep 2 12:15 ttype

crw-rw-rw- 1 root wheel 4, 15 Sep 2 12:15 ttypf

crw-rw-rw- 1 root wheel 4, 16 Sep 2 12:15 ttyq0

crw-rw-rw- 1 root wheel 4, 17 Sep 2 12:15 ttyq1

crw-rw-rw- 1 root wheel 4, 18 Sep 2 12:15 ttyq2

crw-rw-rw- 1 root wheel 4, 19 Sep 2 12:15 ttyq3

crw-rw-rw- 1 root wheel 4, 20 Sep 2 12:15 ttyq4

crw-rw-rw- 1 root wheel 4, 21 Sep 2 12:15 ttyq5

crw-rw-rw- 1 root wheel 4, 22 Sep 2 12:15 ttyq6

crw-rw-rw- 1 root wheel 4, 23 Sep 2 12:15 ttyq7

crw-rw-rw- 1 root wheel 4, 24 Sep 2 12:15 ttyq8

crw-rw-rw- 1 root wheel 4, 25 Sep 2 12:15 ttyq9

crw-rw-rw- 1 root wheel 4, 26 Sep 2 12:15 ttyqa

crw-rw-rw- 1 root wheel 4, 27 Sep 2 12:15 ttyqb

crw-rw-rw- 1 root wheel 4, 28 Sep 2 12:15 ttyqc

crw-rw-rw- 1 root wheel 4, 29 Sep 2 12:15 ttyqd

crw-rw-rw- 1 root wheel 4, 30 Sep 2 12:15 ttyqe

crw-rw-rw- 1 root wheel 4, 31 Sep 2 12:15 ttyqf

crw-rw-rw- 1 root wheel 4, 32 Sep 2 12:15 ttyr0

crw-rw-rw- 1 root wheel 4, 33 Sep 2 12:15 ttyr1

crw-rw-rw- 1 root wheel 4, 34 Sep 2 12:15 ttyr2

crw-rw-rw- 1 root wheel 4, 35 Sep 2 12:15 ttyr3

crw-rw-rw- 1 root wheel 4, 36 Sep 2 12:15 ttyr4

crw-rw-rw- 1 root wheel 4, 37 Sep 2 12:15 ttyr5

crw-rw-rw- 1 root wheel 4, 38 Sep 2 12:15 ttyr6

crw-rw-rw- 1 root wheel 4, 39 Sep 2 12:15 ttyr7

crw-rw-rw- 1 root wheel 4, 40 Sep 2 12:15 ttyr8

crw-rw-rw- 1 root wheel 4, 41 Sep 2 12:15 ttyr9

crw-rw-rw- 1 root wheel 4, 42 Sep 2 12:15 ttyra

crw-rw-rw- 1 root wheel 4, 43 Sep 2 12:15 ttyrb

crw-rw-rw- 1 root wheel 4, 44 Sep 2 12:15 ttyrc

crw-rw-rw- 1 root wheel 4, 45 Sep 2 12:15 ttyrd

crw-rw-rw- 1 root wheel 4, 46 Sep 2 12:15 ttyre

crw-rw-rw- 1 root wheel 4, 47 Sep 2 12:15 ttyrf

crw-rw-rw- 1 root wheel 4, 48 Sep 2 12:15 ttys0

crw--w---- 1 grant tty 16, 0 Sep 8 23:05 ttys000

crw-rw-rw- 1 root wheel 4, 49 Sep 2 12:15 ttys1

crw-rw-rw- 1 root wheel 4, 50 Sep 2 12:15 ttys2

crw-rw-rw- 1 root wheel 4, 51 Sep 2 12:15 ttys3

crw-rw-rw- 1 root wheel 4, 52 Sep 2 12:15 ttys4

crw-rw-rw- 1 root wheel 4, 53 Sep 2 12:15 ttys5

crw-rw-rw- 1 root wheel 4, 54 Sep 2 12:15 ttys6

crw-rw-rw- 1 root wheel 4, 55 Sep 2 12:15 ttys7

crw-rw-rw- 1 root wheel 4, 56 Sep 2 12:15 ttys8

crw-rw-rw- 1 root wheel 4, 57 Sep 2 12:15 ttys9

crw-rw-rw- 1 root wheel 4, 58 Sep 2 12:15 ttysa

crw-rw-rw- 1 root wheel 4, 59 Sep 2 12:15 ttysb

crw-rw-rw- 1 root wheel 4, 60 Sep 2 12:15 ttysc

crw-rw-rw- 1 root wheel 4, 61 Sep 2 12:15 ttysd

crw-rw-rw- 1 root wheel 4, 62 Sep 2 12:15 ttyse

crw-rw-rw- 1 root wheel 4, 63 Sep 2 12:15 ttysf

crw-rw-rw- 1 root wheel 4, 64 Sep 2 12:15 ttyt0

crw-rw-rw- 1 root wheel 4, 65 Sep 2 12:15 ttyt1

crw-rw-rw- 1 root wheel 4, 66 Sep 2 12:15 ttyt2

crw-rw-rw- 1 root wheel 4, 67 Sep 2 12:15 ttyt3

crw-rw-rw- 1 root wheel 4, 68 Sep 2 12:15 ttyt4

crw-rw-rw- 1 root wheel 4, 69 Sep 2 12:15 ttyt5

crw-rw-rw- 1 root wheel 4, 70 Sep 2 12:15 ttyt6

crw-rw-rw- 1 root wheel 4, 71 Sep 2 12:15 ttyt7

crw-rw-rw- 1 root wheel 4, 72 Sep 2 12:15 ttyt8

crw-rw-rw- 1 root wheel 4, 73 Sep 2 12:15 ttyt9

crw-rw-rw- 1 root wheel 4, 74 Sep 2 12:15 ttyta

crw-rw-rw- 1 root wheel 4, 75 Sep 2 12:15 ttytb

crw-rw-rw- 1 root wheel 4, 76 Sep 2 12:15 ttytc

crw-rw-rw- 1 root wheel 4, 77 Sep 2 12:15 ttytd

crw-rw-rw- 1 root wheel 4, 78 Sep 2 12:15 ttyte

crw-rw-rw- 1 root wheel 4, 79 Sep 2 12:15 ttytf

crw-rw-rw- 1 root wheel 4, 80 Sep 2 12:15 ttyu0

crw-rw-rw- 1 root wheel 4, 81 Sep 2 12:15 ttyu1

crw-rw-rw- 1 root wheel 4, 82 Sep 2 12:15 ttyu2

crw-rw-rw- 1 root wheel 4, 83 Sep 2 12:15 ttyu3

crw-rw-rw- 1 root wheel 4, 84 Sep 2 12:15 ttyu4

crw-rw-rw- 1 root wheel 4, 85 Sep 2 12:15 ttyu5

crw-rw-rw- 1 root wheel 4, 86 Sep 2 12:15 ttyu6

crw-rw-rw- 1 root wheel 4, 87 Sep 2 12:15 ttyu7

crw-rw-rw- 1 root wheel 4, 88 Sep 2 12:15 ttyu8

crw-rw-rw- 1 root wheel 4, 89 Sep 2 12:15 ttyu9

crw-rw-rw- 1 root wheel 4, 90 Sep 2 12:15 ttyua

crw-rw-rw- 1 root wheel 4, 91 Sep 2 12:15 ttyub

crw-rw-rw- 1 root wheel 4, 92 Sep 2 12:15 ttyuc

crw-rw-rw- 1 root wheel 4, 93 Sep 2 12:15 ttyud

crw-rw-rw- 1 root wheel 4, 94 Sep 2 12:15 ttyue

crw-rw-rw- 1 root wheel 4, 95 Sep 2 12:15 ttyuf

crw-rw-rw- 1 root wheel 4, 96 Sep 2 12:15 ttyv0

crw-rw-rw- 1 root wheel 4, 97 Sep 2 12:15 ttyv1

crw-rw-rw- 1 root wheel 4, 98 Sep 2 12:15 ttyv2

crw-rw-rw- 1 root wheel 4, 99 Sep 2 12:15 ttyv3

crw-rw-rw- 1 root wheel 4, 100 Sep 2 12:15 ttyv4

crw-rw-rw- 1 root wheel 4, 101 Sep 2 12:15 ttyv5

crw-rw-rw- 1 root wheel 4, 102 Sep 2 12:15 ttyv6

crw-rw-rw- 1 root wheel 4, 103 Sep 2 12:15 ttyv7

crw-rw-rw- 1 root wheel 4, 104 Sep 2 12:15 ttyv8

crw-rw-rw- 1 root wheel 4, 105 Sep 2 12:15 ttyv9

crw-rw-rw- 1 root wheel 4, 106 Sep 2 12:15 ttyva

crw-rw-rw- 1 root wheel 4, 107 Sep 2 12:15 ttyvb

crw-rw-rw- 1 root wheel 4, 108 Sep 2 12:15 ttyvc

crw-rw-rw- 1 root wheel 4, 109 Sep 2 12:15 ttyvd

crw-rw-rw- 1 root wheel 4, 110 Sep 2 12:15 ttyve

crw-rw-rw- 1 root wheel 4, 111 Sep 2 12:15 ttyvf

crw-rw-rw- 1 root wheel 4, 112 Sep 2 12:15 ttyw0

crw-rw-rw- 1 root wheel 4, 113 Sep 2 12:15 ttyw1

crw-rw-rw- 1 root wheel 4, 114 Sep 2 12:15 ttyw2

crw-rw-rw- 1 root wheel 4, 115 Sep 2 12:15 ttyw3

crw-rw-rw- 1 root wheel 4, 116 Sep 2 12:15 ttyw4

crw-rw-rw- 1 root wheel 4, 117 Sep 2 12:15 ttyw5

crw-rw-rw- 1 root wheel 4, 118 Sep 2 12:15 ttyw6

crw-rw-rw- 1 root wheel 4, 119 Sep 2 12:15 ttyw7

crw-rw-rw- 1 root wheel 4, 120 Sep 2 12:15 ttyw8

crw-rw-rw- 1 root wheel 4, 121 Sep 2 12:15 ttyw9

crw-rw-rw- 1 root wheel 4, 122 Sep 2 12:15 ttywa

crw-rw-rw- 1 root wheel 4, 123 Sep 2 12:15 ttywb

crw-rw-rw- 1 root wheel 4, 124 Sep 2 12:15 ttywc

crw-rw-rw- 1 root wheel 4, 125 Sep 2 12:15 ttywd

crw-rw-rw- 1 root wheel 4, 126 Sep 2 12:15 ttywe

crw-rw-rw- 1 root wheel 4, 127 Sep 2 12:15 ttywf

crw-rw-rw- 1 root wheel 11, 1 Sep 2 12:15 urandom

crw-rw-rw- 1 root wheel 3, 3 Sep 2 12:15 zero

Sep 8, 2016 8:06 PM

The Macintosh Hard Disk 20 was the first hard drive developed by Apple Computer specifically for use with the Macintosh 512K. Introduced on September 17, 1985, it was part of Apple's long-awaited solution toward completing the Macintosh Office (a suite of integrated business hardware & software) announced in January 1985. It would be over a year more before Apple would release the file server software AppleShare that would link all of the hardware together. By that time the SCSI interface introduced on the Macintosh Plus in January 1986, would accommodate far faster and more efficient hard drives, rendering the Hard Disk 20 virtually obsolete.^[3]

Features[edit]

The Hard Disk 20 (or HD20, as it was known colloquially) contained a 20 MB 3.5' Rodimehard disk which provided over 50 times the data storage of the stock 400 kB disk drive. At the time when the average file size was around 10-20 kB and due to the vast number of those files the HD 20 could contain, Apple's original Macintosh File System, which did not allow for directories, would have made organizing those files unwieldy. Therefore, Apple introduced it with a new System and Finder update which included the brand new Hierarchical File System allowing the user to better organize files on such a large volume. As a result, only the Macintosh 512K could access it; the original Macintosh 128K did not have enough RAM to load the new file system. In fact, even for the Macintosh 512K to use the drive, it required an additional file in the System Folder on a special startup disk which added additional code into memory during startup. An ingenious startup routine also allowed the Mac to check for the presence of a System file on the Hard Disk, switch over to it and eject the startup disk. Unfortunately, the HD 20 could not be used as a startup disk directly without first loading the code from the floppy disk drive. With the release of the Macintosh Plus and the Macintosh 512Ke, both containing the upgraded 128 kB ROM which contained the additional code, the HD 20 could finally be used alone as a startup disk.

The drive had a rotational speed of 45.73 rotations/second (2744 rpm) and access time of 85 ms.^[2]

While other hard drives were available on the market, Apple's HD 20 was generally preferred mainly because Apple broke their own development rules when they offered it. Originally the Macintosh was designed with two serial ports which were to meet all the expansion needs of the user. It also included a dedicated floppy disk port for one external floppy disk. Most of the hard drives which were available on the market used the slower serial port to transfer data per Apple's specifications. Apple instead engineered the HD 20 to use the faster floppy disk port, enabling the user to daisy-chain an external floppy disk drive as well as an additional HD 20. With few exceptions, this along with complete compatibility with the new Hierarchical File System, gave Apple an instant edge over the competition. In addition, the HD 20 had a convenient 'zero-footprint' design which fit precisely underneath the Macintosh, merely elevating it 3 inches, but otherwise taking up no more desk-space.^[4]

History[edit]

In 1985, the HD 20 was an important step to solidifying the Macintosh as a true business computer and it was eagerly anticipated following its April announcement. Until Apple's introduction a year later of the Hard Disk 20SC, the first SCSI drive they manufactured, the HD 20 was the only Apple-manufactured hard drive available for any Macintosh except the Macintosh XL. The HD20 was not compatible with any other Apple computer or other platforms.

However, the HD 20's unique design and position in the marketplace was quickly outmoded by the advancement of the significantly faster SCSI standard which also debuted with the Macintosh Plus in January 1986. Some third party companies offered a SCSI conversion kit which replaced the controller board thus preserving the user's investment in the expensive but proprietary Rodime drive.^[5] Apple officially dropped support for the HD 20 with System 6 as well as omitting the necessary ROM code beginning with the Macintosh II.^[6] Sales of the HD 20 continued to support the Macintosh 512Ke which had no other hard drive options until it was discontinued in late 1987. Apple quickly dropped support for the HD 20 in all of its newer Macs, only to find many business users upgrading their older systems needed a way to transfer data from the unsupported drives to the newer Macs. Only Macs with legacy technology and floppy disk ports, which were eliminated entirely from Macintosh computers in 1991, were able to continue to use the older slower technology.

Manufactured in significant numbers for almost two years, the HD 20 remains as one of the few surviving hard drives a stock Macintosh 512K or 512Ke can use.

See also[edit]

References[edit]

1. ^'The Mac Plus 30 Years On'. January 24, 2016. Retrieved April 20, 2016.
2. ^ ^ab'Apple brand HD20, HD20 SC Info'. 2010. Retrieved April 20, 2016.
3. ^Macintosh 128K and 512K: SCSI Hard Drives
4. ^Lewis, Peter H (October 8, 1985). 'Peripherals; Apple gives its Macintosh a hard disk'. New York Times. Retrieved December 30, 2007.Cite has empty unknown parameter: |coauthors= (help)
5. ^Apple HD-20: How To Convert It Into A SCSI Device
6. ^System 6.0.3: Incompatible with Macintosh 512Ke and HD20

External links[edit]

• Hard Disk 20 technical specifications at apple.com at the Wayback Machine (archived May 16, 2011)
• Mac Systems Compatible with Hard Disk 20 at apple.com
• Hard Disk 20 tutorial at VintageMacWorld.com
• Hard Disk 20 Info at Mac512.com's Classic Macintosh Preservation area at the Wayback Machine (archived February 20, 2007)
• The M0001 Registry Owners of Vintage Macintosh