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Re: Dead II+ Rev.7 motherboard
- Subject: Re: Dead II+ Rev.7 motherboard
- From: "Bryan Parkoff" <nospam@nospam.com>
- Date: Sun, 13 Aug 2006 15:10:22 GMT
- Newsgroups: comp.sys.apple2
- Organization: SBC http://yahoo.sbc.com
- References: <44df2c91$0$6992$9b4e6d93@newsspool1.arcor-online.net> <44df3073$0$20029$9b4e6d93@newsspool4.arcor-online.net> <ebncpm$b9s$1@theodyn.ncf.ca>
- Reply-to: "Bryan Parkoff" <nospam@nospam.com>
- Xref: g2news2.google.com comp.sys.apple2:11451
"Michael Black" <et472@FreeNet.Carleton.CA> wrote in message
news:ebncpm$b9s$1@theodyn.ncf.ca...
> Linards Ticmanis (ticmanis@gmx.de) writes:
>> Linards Ticmanis wrote:
>>
>>> Replacing the LS11 didn't help.
>>
>> I should add that I only had a 74HCT11 available as a replacement, which
>> maybe is not close enough in timing to a real 74LS11 to accurately
>> create the LD194 signal.
>>
> That HCT is CMOS, and the issue may be incompatibility with the lower
> power schottkey devices already in the II. Before you panic too much,
> get the proper 74LS11.
>
> Michael
>
Hello,
When you look at several chips at Apple II+'s motherboard. It is not
wise to combine HCT chip and LS chip. It requires to use the same power
where it is flowing on the logic circuit. All S and LS chips are used.
Bryan Parkoff