Apple II

IC question

Submitted by kchrister on June 25, 2018 - 8:56pm

Hi I am fairly sure these questions have been asked before, but I am unable to find the correct thread.
I am trying to find the parts for an empty (totally stripped Apple IIe motherboard). I have questions about to chips. I am reading the Apple IIe Repair Guide by Double Density on A2OL, in the inventory list they mention IC MC741 (OpAmp) in location A11, is this the correct chip, or can it be replaced my an LM741? I know I will most likely not ever need it, as it is the amplifier for the cassette player, still I like the board complete.

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Apple II

Apple IIGS ROM03 with "Turbo->28"

Submitted by NewtonMike on June 23, 2018 - 11:22pm

Hi, all

Any one has idea on Apple IIGS ROM03 with boot screen first line "Turbo->28" rather than "Apple IIGS"? Is it an early ROM03 unit, developer unit or?
I couldn't find any information from the web.

Thanks,
Michael

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Apple II

FPGA Apple IIGS - Latest 2018 news?

Submitted by ringquest on June 20, 2018 - 10:45pm

To date, how far has an Apple IIgs FPGA or core for any FPGA platform come to fruition?

I must say I have great fun with the MIST Apple IIc core. I wish it got an update for write support or GS features.

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Apple II

New ProTerm BBS Game

Submitted by skipper1947 on June 18, 2018 - 10:42am

I thought I had submitted this a day or so ago, it looks like I goofed something up, so I will try again. Smile
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Apple II

Modern day methods to upgrade a Rom 00 IIgs to 01 or 03?

Submitted by ringquest on June 17, 2018 - 8:04am

Questions on Rom revisions:

1. Is Rom 3 the best and fully compatible with all software or have it's quirks? Is there some reason people would want to stick with Rom 01?
2. What are my options to upgrade a Rom 00?

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Apple II

Apple IIe Diagnostics Card 2018 version!!!

Submitted by jwg1962 on June 16, 2018 - 6:13pm

Well,

I soldered the prototype of the Apple IIe diagnostics together today with the parts I sourced and it works!!!!

I included a picture of the screen and the card.

I soldered Machined sockets on the card so I can use it as a test Jig. Also, I didn't solder the black ROM socket either.

I am going to put a few more of these together this weekend, but you will see them soon on Henry's RM page to buy.

WooHoo!!!

Thanks,
Jay

I added another board I made from another fabricator and it worked too!!!

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Apple II

USB serial to Apple II ASCII keyboard connector

Submitted by grimmware on June 11, 2018 - 9:30am

tl;dr: Skip to the bottom for link to the video.

Hello! I'm new here because my dad found an Apple II Europlus that he has no recollection of ever owning in his attic, and I promptly pinched it saying that I would get it up and running for him.

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Apple II

BBS Documentaries

Submitted by wishtoknow on June 9, 2018 - 1:28am

Some great Apple II BBS documentaries are now released
on archive.org

Here is one about "The Freeze"

https://archive.org/details/bbs-20030520-freeze/Frank+Segler+-+The+Freeze+-+Tape+3+of+3.avi

and here is one about the MidWest Pirates Guild

https://archive.org/details/20040125-bbs-612

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Apple II

Replacing RTC battery in Woz Edition GS

Submitted by ringquest on June 6, 2018 - 5:41pm

Perhaps your Apple expertise would know more about this Apple IIGS product:
https://www.reactivemicro.com/product/battery-iigs-rom0-1-caddy

My Rom1 Woz Edition GS: Online guides and videos say to ONLY use original PART NO: TADIRAN BATTERIES TL-5902/P 1.2 Ah, 3.6 V, 1/2AA. Prior to that tidbit, I ordered someone's suggested Tadiran TL-5101/P at 3.6V 0.95Ah 2-Pin. I'm concerned about the 0.95Ah if the original is 1.2 Ah. Other guides say NOT to use alternative brands like SAFT and GMPower, etc. I know the battery is just for RTC but:

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Apple II

Apple IIgs 3.5 Floppy problem

Submitted by ringquest on June 6, 2018 - 5:39pm

Hi! Recently got a IIGS Woz Edition and cleaning it nicely. My 3.5 drive from the IIGS wasn't working so I watched some tutorials and opened it up: not too dirty but I cleaned it anyway. I discovered I had a broken cog wheel and have a replacement on the way - I re-did the moving parts lubrication with new silicone grease and cleaned the read/write head with alcohol on a cotton swab. Still won't read disks. So far my 5.25 drive works but I can't load GS stuff until I sort the 3.5 drive.

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