Thanks to Skagon for pointing me in the direction of retroclinic.com - it looks as though WD1772 chips are still available out there (well the VL1772) - although he had to buy 250 last time he bought some.
Cost is around $8 USD per chip (plus import duties, VAT and postage and the handling charge for the import duty and VAT) - so works out at about $10 USD per chip
Would be hard to justify this many unless someone does come up with a new disk interface (although the excess stock could of course then be sold for other retro machines)....
Mark of retroclinic pointed me to 2 dealers he has used:
http://www.bermanelectronic.com/
and
http://www.utsource.net/VL1772.html
WD1770 /2 Chips
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- RWAP Master
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WD1770 /2 Chips
Rich Mellor
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Re: WD1770 /2 Chips
Standby alert
“There are four lights!”
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer in Somerset later in the year
QL, Falcon, Atari 520STFM, Atari 1040STE, more PC's than I care to count and an assortment of 8 bit micros (Sinclair and Acorn)(nearly forgot the Psion's)
“There are four lights!”
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer in Somerset later in the year
QL, Falcon, Atari 520STFM, Atari 1040STE, more PC's than I care to count and an assortment of 8 bit micros (Sinclair and Acorn)(nearly forgot the Psion's)
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- RWAP Master
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Re: WD1770 /2 Chips
Any ideas on what the extra letters are after the 1770 or 1772 - the ones in the Trump Card do not have letters after them so far as I recall.
I know you have to be careful with some of the early interfaces - I had a couple where the 1770 chip had failed - I tried replacing it with a 1772 chip from a Trump Card, and they would not even initialise - presumably due to timing differences.
I know you have to be careful with some of the early interfaces - I had a couple where the 1770 chip had failed - I tried replacing it with a 1772 chip from a Trump Card, and they would not even initialise - presumably due to timing differences.
Rich Mellor
RWAP Software
RWAP Adventures
SellMyRetro
Retro-Printer Module - add a USB printer to your QL
Also Involved in:
Icephorm
RWAP Software
RWAP Adventures
SellMyRetro
Retro-Printer Module - add a USB printer to your QL
Also Involved in:
Icephorm
- 1024MAK
- Super Gold Card
- Posts: 592
- Joined: Sun Dec 11, 2011 1:16 am
- Location: Looking forward to summer in Somerset, UK...
Re: WD1770 /2 Chips
IIRC the 1770 and 1772 have different step rates, the 1772 being more suitable for 3½ drives.
The WD1772-PH02-02 is a faster rated WD1772 so on machines that can handle faster disk transfers, you can feed in a faster clock signal to the WD1772 and can then read and write to HD disks in a HD FDD
I cannot find my copy of a data sheet ATM, but these Atari Wiki pages contain some info:-
Programming information for the Western Digital 1770-00 and 1772-00 floppy disk drive controllers
WD1770/1772 5 1/4 " Floppy Disk Controller/Formatter
Mark
The WD1772-PH02-02 is a faster rated WD1772 so on machines that can handle faster disk transfers, you can feed in a faster clock signal to the WD1772 and can then read and write to HD disks in a HD FDD
I cannot find my copy of a data sheet ATM, but these Atari Wiki pages contain some info:-
Programming information for the Western Digital 1770-00 and 1772-00 floppy disk drive controllers
WD1770/1772 5 1/4 " Floppy Disk Controller/Formatter
Mark
Standby alert
“There are four lights!”
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer in Somerset later in the year
QL, Falcon, Atari 520STFM, Atari 1040STE, more PC's than I care to count and an assortment of 8 bit micros (Sinclair and Acorn)(nearly forgot the Psion's)
“There are four lights!”
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer in Somerset later in the year
QL, Falcon, Atari 520STFM, Atari 1040STE, more PC's than I care to count and an assortment of 8 bit micros (Sinclair and Acorn)(nearly forgot the Psion's)
- 1024MAK
- Super Gold Card
- Posts: 592
- Joined: Sun Dec 11, 2011 1:16 am
- Location: Looking forward to summer in Somerset, UK...
Re: WD1770 /2 Chips
The P means plastic DIP package, the H means 28 lead / pin package.
Data sheet for the WD1772-02 here
Also here is an edited version
See also:-
http://www.datasheetarchive.com/WD1770-datasheet.html
http://www.datasheetarchive.com/WD1772-datasheet.html
Mark
Data sheet for the WD1772-02 here
Also here is an edited version
See also:-
http://www.datasheetarchive.com/WD1770-datasheet.html
http://www.datasheetarchive.com/WD1772-datasheet.html
Mark
Standby alert
“There are four lights!”
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer in Somerset later in the year
QL, Falcon, Atari 520STFM, Atari 1040STE, more PC's than I care to count and an assortment of 8 bit micros (Sinclair and Acorn)(nearly forgot the Psion's)
“There are four lights!”
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer in Somerset later in the year
QL, Falcon, Atari 520STFM, Atari 1040STE, more PC's than I care to count and an assortment of 8 bit micros (Sinclair and Acorn)(nearly forgot the Psion's)