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Re: I have a IIgs. So now what?
Allen Bong wrote:
> On Mar 3, 8:53 am, Tristan Mumford <xtristan.xmumf...@xgmail.xcom>
> wrote:
>> William Garber wrote:
>>
>> > "Jon" <jon...@gmail.com> wrote in message
>> >1172825566.829716.159940@v33g2000cwv.googlegroups.com">news:1172825566.829716.159940@v33g2000cwv.googlegroups.com...
>> > : On Mar 2, 6:51 pm, Tristan Mumford <xtristan.xmumf...@xgmail.xcom>
-snip-
>> > The 74LS04, 74LS05, 74LS06, 74LS14 (schmitt trigger),
>> > and CD4069 (open collector), should all be compatible.
>>
>> Are you sure about the 74LS14? I have one of them readily accessible
>> (it's in my floppy adaptor board, and another in a dead 386 board I strip
>> for parts.
>>
>> Tristan.
>>
>>
>>
>> > William Garber
>> > Email Address - willy4...@garberstreet.com
>> > Alt. Email - willy4...@comcast.net
>> > Web address -http://www.garberstreet.com
>>
>> --
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>> ===== It's not pretty, it's not great, but it is mine. =====-
>> Hide quoted text -
>>
>> - Show quoted text -
>
> http://www.datasheet4u.com/html/7/4/L/74LS14_TexasInstruments.pdf.html
>
> 74LS14 is a bad substitute for LS06 or LS05 as its o/p are not open-
> collector (see datasheet above)
Thought as much. It would be okay for my adaptor card but not for a real
drive, and I'd still like to be able to use both.
>
>>From my Disk ][ circuit diagram the pullup for the /WR REQ comes from
> the disk drive's analog board. If you are not getting +5 on pin 4 of
> your 74ls06, it might be an open resistor 1K R15 on the disk drive
> card.
I'm getting a constant +5v on /WREQ. This is because there was a short on
the adaptor that connected it to -12v. The rest of the IC and board still
seems to function fine, it's just /WREQ stays high. I tested it with both a
real drive and my adaptor.
You mean a resistor on the analog card right?
It wouldn't be that. The fault is the same with two drives and my board.
Good idea though. It didn't occur to me.
I wonder if there's an '06 or '05 I can borrow from the clone.
Tristan.
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===== It's not pretty, it's not great, but it is mine. =====