Gilderfluke&Co old MACs 8 bit Digital Audio System - Manual (Page 13)

memory they need to use and adjust their speeds as often as thirty-five times each second.
Although this 'downshifting' saves the amount of memory you need to use, it can make it darned
difficult to estimate the number of EPROMs your recording will need until it has actually been digitized.
The following charts show the capacities with a variety of sounds using different sized EPROMs:
Approximate Play Times:
Estimated Playing Times For Various Types Of Sounds
High Voices
Music
High Music Voices
1.7 Sec.
30 Sec.
7.5 Min.
2 Khz 3 Khz 4 Khz 5 Khz 7.5 Khz 10 Khz 15 Khz
each Repeater (16 chips) 3.7 Min. 2.5 Min. 2 Min. 89.5 Sec. 1 Min. 44.6 Sec
each Expansion (32 chips) 5 Min. 4 Min. 3 Min. 2 Min. 89.5 Sec. 1 Min.
Low Rumbles
Sharp Sound Effects
Each Chip (1 chip) 14 Sec. 9.3 Sec. 7.5 Sec. 5.6 Sec. 3.7 Sec. 2.8 Sec.
Number Of 27C512
Memory Chips
High Voices
Music
High Music Voices
3.7 Sec.
1 Min.
14.9 Min.
2 Khz 3 Khz 4 Khz 5 Khz 7.5 Khz 10 Khz 15 Khz
each Repeater (16 chips) 7.4 Min. 4.9 Min. 4 Min. 2.75 Min. 2 Min. 1.5 Min.
each Expansion (32 chips) 9.9 Min. 8 Min. 5.5 Min. 4 Min. 3 Min. 2 Min.
Low Rumbles
Sharp Sound Effects
Each Chip (1 chip) 28 Sec. 18.6 Sec. 14.9 Sec. 11.2 Sec. 7.5 Sec. 5.6 Sec.
Number Of 27C010
Memory Chips
High Voices
Music
High Music Voices
7.5 Sec.
2 Min.
29.8 Min.
2 Khz 3 Khz 4 Khz 5 Khz 7.5 Khz 10 Khz 15 Khz
each Repeater (16 chips) 14.9 Min. 9.9 Min. 8 Min. 6 Min. 4 Min. 3 Min.
each Expansion (32 chips) 19.9 Min. 16 Min. 12 Min. 8 Min. 6 Min. 4 Min.
Low Rumbles
Sharp Sound Effects
Each Chip (1 chip) 55.9 Sec. 37.3 Sec. 30 Sec. 22.4 Sec. 14.9 Sec. 11.1 Sec.
Number Of 27C020
Memory Chips
High Voices
Music
High Music Voices
14.9 Sec.
4 Min.
59.6 Min.
2 Khz 3 Khz 4 Khz 5 Khz 7.5 Khz 10 Khz 15 Khz
each Repeater (16 chips) 29.8 Min. 19.9 Min. 15.9 Min. 11.9 Min. 8 Min. 6 Min.
each Expansion (32 chips) 39.8 Min. 31 Min. 23 Min. 16 Min. 12 Min. 8 Min.
Low Rumbles
Sharp Sound Effects
Each Chip (1 chip) 111.8 Sec. 74.6 Sec. 59.7 Sec. 44.7 Sec. 29.8 Sec. 22.3 Sec.
Number Of 27C040
Memory Chips
High Voices
Music
High Music Voices
29.8 Sec.
8 Min.
119.3 Min.
2 Khz 3 Khz 4 Khz 5 Khz 7.5 Khz 10 Khz 15 Khz
each Repeater (16 chips) 59.6 Min. 39.8 Min. 32 Min. 24 Min. 16 Min. 12 Min.
each Expansion (32 chips) 79.5 Min. 64 Min. 48 Min. 32 Min. 24 Min. 16 Min.
Low Rumbles
Sharp Sound Effects
Each Chip (1 chip) 223.7 Sec. 149.1 Sec. 119.3 Sec. 89.5 Sec. 59.7 Min. 44.7 Sec.
Number Of 27C080
Memory Chips
Each DR-50 or AB-50 MiniRepeater holds one EPROM. There is no expansion available on these
repeaters.
Each DR-100, DR-300, or AB-100 Digital Audio Repeater Card holds 16 EPROMs. If your recording
needs more space than this, you can add memory expansion cards to the Repeater cards. Each
expansion card holds another 32 EPROMs. The difference between a MX-100 and a MX-200 is their
height. A Digital Audio Repeater / Mixer card with one MX-200 memory expansion board can fit into the
same 1 inch wide space as the Digital Audio Repeater / Mixer alone. With two or more memory
expansion cards, additional 1 inch wide spaces will be needed and you can use MX-100 expansion
cards. Each Digital Audio Repeater / Mixer card can support unlimited amount of data storage. The only
limitation is the physical mounting of the memory expansion cards. Seven expansion cards on a
Repeater card is the normal physical limit for card cage mounted systems. This forms a package which
takes up 4 inches of card cage space.
In audio bricks (AB-100) there is room for up to three memory expansion cards.
The Digital Audio Repeater / Mixer cards can support any type of EPROM memory chips from 27C512
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