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31:
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The WD1770, WD1772, and WD1773 added an internal digital data separator and write precompensator, eliminating the need for external passive components but raising the clock rate requirement to 8 MHz. They supported double density, despite the apparent regression of the part number, and were
154:
which supported high density (500 kbit/s) operation. After production at WD could not be sustained, Atari decided to license the design and modify it to get high density and extra density (1 MBit/s) operation. The chip was codenamed "Ajax", had the number C302096 and was produced by
127:
for single density and 250 kbit/s for double density, thus preventing them from being used for 8-in (200 mm) floppy drives or the later "high-density" 5.25-inch (133 mm) or 90 mm floppy drives. These were sold at a lower price point and widely used in
326:
283:"The FD1771 is a single-chip floppy disk formatter/controller that interfaces with most available disk drives and virtually all types of computers."
430:
322:
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69:
and increasingly added onboard circuitry that formerly had to be implemented in external components. Originally packaged as 40-pin
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143:. They took a 1 MHz or 2 MHz clock and were intended for 8-inch (203 mm) and 5.25-inch (133 mm) drives.
17:
679:
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109:
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58:
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265:
Michalopoulos, Demetrios A (October 1976). "New
Products: Single-chip floppy disk formatter/controller".
119:
The WD1761-WD1767 series were versions of the FD179x series rated for a maximum clock frequency of 1
444:
535:
545:
365:
The FD1781 was announced on
September 21, 1977. Supported Dual density; accommodates MFM, M2FM.
73:(DIP) format, later models moved to a 28-pin format that further lowered implementation costs.
47:
54:. It is the first in a line of floppy disk controllers that Western Digital produced. It uses
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98:
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70:
8:
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136:
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209:
89:, but required external modulation and demodulation circuitry, so it could support
81:
The FD1771 was succeeded by many derivatives that were mostly software-compatible:
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The FD1771 was announced on July 19, 1976, and sold for $ 60 each in lots of 100.
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The WD2791-WD2797 series added an internal data separator using an analog
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The WD1772PH02-02 was a version of the chip that Atari fitted to the
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Western
Digital datasheet for the FD1771 floppy disk controller
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638:
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94:
217:
164:
Many compatible chips were available from other vendors:
139:, with some external passive components required for the
120:
116:
disk format. They required an external data separator.
431:
Western
Digital Storage Management Produces Handbook
104:
The FD1791-FD1797 series added internal support for
340:
286:
184:Soviet KR1818WG93 (КР1818ВГ93) was a WD1793 analog
661:
258:
65:. Later models in the series added support for
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387:
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502:
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433:- describes the entire line of products.
123:, resulting in a data rate limit of 125
29:
375:"Dual Density Floppy Controller Chip".
168:FD179x series from SMC Microelectronics
14:
662:
440:
320:
466:
159:
24:
424:
112:) modulation, compatible with the
101:or other double-density encodings.
25:
691:
355:(12). IEEE: 140. December 1977.
321:Guzis, Charles P. (2009-09-13).
147:packaged in 28-pin DIP packages.
329:from the original on 2017-03-25
409:
398:
314:
301:(10). IEEE: 66. October 1976.
76:
13:
1:
251:
670:Floppy disk computer storage
85:The FD1781 was designed for
7:
347:"Recent IC Announcements".
293:"Recent IC Announcements".
10:
696:
416:WD177X-00 datasheet images
606:
559:
518:
511:
500:
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171:MB8876A and MB8877A from
680:Western Digital products
224:disk interfaces for the
188:These were used in many
361:10.1109/C-M.1977.217618
307:10.1109/C-M.1976.218417
279:10.1109/C-M.1976.218414
567:Portable media players
48:floppy disk controller
35:
27:Floppy disk controller
383:(3): 216. March 1978.
246:Atari 8-bit computers
33:
394:FD 179X-02 datasheet
71:dual in-line package
18:Western Digital 2797
675:Integrated circuits
405:WD279X-02 datasheet
177:VL177x series from
61:introduced in the
36:
657:
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602:
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216:, as well as the
137:phase-locked loop
50:chip produced by
16:(Redirected from
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649:Virident Systems
629:Paradise Systems
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273:(10). IEEE: 64.
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210:Acorn Archimedes
160:Compatible chips
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619:Arkeia Software
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179:VLSI Technology
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52:Western Digital
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12:
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230:Commodore 157x
198:Acorn Electron
192:including the
190:microcomputers
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133:
132:floppy drives.
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106:double density
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87:double density
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56:single density
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323:"Durango GCR"
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130:home computer
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114:IBM System/34
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607:Acquisitions
531:Media Center
525:
492:Professional
411:
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389:
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352:
348:
342:
331:. Retrieved
316:
298:
294:
288:
270:
266:
260:
238:Commodore 64
187:
163:
80:
67:MFM encoding
43:
42:, sometimes
39:
37:
541:My Passport
242:Atari XF551
226:ZX Spectrum
77:Derivatives
59:FM encoding
664:Categories
333:2017-03-25
252:References
212:, and the
202:BBC Master
614:Amplidata
325:. Sydex.
214:SAM Coupé
152:Atari STE
594:StartKey
512:Products
349:Computer
327:Archived
295:Computer
267:Computer
244:for the
240:and the
236:for the
222:DISCiPLE
206:Atari ST
155:Toshiba.
63:IBM 3740
634:SanDisk
560:SanDisk
536:My Book
487:SanDisk
173:Fujitsu
46:, is a
546:Raptor
526:FD1771
475:Brands
228:, the
194:TRS-80
125:kbit/s
44:WD1771
40:FD1771
587:Fuze+
551:WD TV
639:sTec
624:HGST
582:Fuze
577:e200
572:c200
377:Byte
234:1581
220:and
95:M2FM
38:The
357:doi
303:doi
275:doi
141:VCO
121:MHz
110:MFM
99:GCR
91:MFM
666::
519:WD
482:WD
379:.
353:10
351:.
297:.
269:.
248:.
218:+D
208:,
204:,
200:,
196:,
97:,
93:,
460:e
453:t
446:v
381:3
363:.
359::
336:.
309:.
305::
299:9
281:.
277::
271:9
232:/
181:.
108:(
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
