Apple II

Having trouble inserting disks in dual disk drive

Submitted by gordonf on June 22, 2022 - 8:30am

I managed to clean up and repair an Apple IIe bought from a local owner. The progress of that is here:

https://youtube.com/playlist?list=PLG3aeorKmd7ajZHmgkbCI0g-k7w1ObaUc

I'm stuck with the dual disk drive not letting me insert some disks. This started after I removed the disk mechanisms from the case for retrobrighting, and it seems disks get stuck right in the middle on the leading edge.

I'm prepared to send this drive to an expert, but are there obvious things I should look for?

The drives themselves appear to read and write disks fine otherwise.

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Interchangeablility of 74LS and 74HCT logic

Submitted by profdc9 on June 21, 2022 - 7:22pm

A quick question.  Back in the day when 74LS was the primary logic family used for microcomputers, the output of 74 bipolar TTL logic typically sinks current much more than it sources (for example can sink 2-3 mA whereas it might only be able to source 0.5 mA).  It seems that a lot of manufacturers are using HCT thresholded logic for many inputs as these are compatible with 3.3 and 5 volt logic thresholds for input and output, where the typical low threshold is 0.8 V and high threshold is 2.0 V.  This is similar to NMOS, however, as far as I know there are no more NMOS process chips made. 

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Floppy card and Saturn 128K Clone Available

Submitted by Stargeezer on June 21, 2022 - 10:22am

Hi All:

I hope everyone is doing well and happy summer to our Northern Hemisphere friends.

I am continuing to clean out extra items in my collection.  I have two cards avaiable for trade or sale.

1) A non-Apple branded floppy controller card : Untested

2) A Satrun 128k clone : NO CHIPS, Untested.

I would love to find an Apple II+ keyboard encoder to trade these for.

As for $$ DM me with an offer.  I have no specific amount in mind.

Cheers,

mark

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Apple II AppleTalk II interface card A2B2080 - ROM Dump

Submitted by ggb on June 21, 2022 - 7:21am

Does anyone have an A2B2080 Apple II AppleTalk II interface card.

I know there was discussion here on Applefritter of one that was list and sold on eBay in 2013.

link to original Applefritter discussion

 

If someone does have one could they dump the ROM and make it available.

 

 

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Apple II

Stereo Speech for Mockingboard and Phasor Sound Cards

Submitted by noxakalabeth on June 20, 2022 - 12:41pm

In an article written by Steve Ciarcia entitled "Build a Third-Generation Phonetic Speech Synthesizer" (BYTE, March 1984, Vol. 9, No. 3), he mentions stereo speech for a Mockingboard equipped with 2 SSI-263 ICs. However, this feature appears to have been a curiosity for engineers and advanced hobbyists. Does anyone know of Apple II applications which utilized stereo speech? I am especially interested in hearing from former Sweet Micro Systems and/or Applied Engineering--for the Phasor--employees!

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Apple II

Apple ii ][ 2 clone no longer booting

Submitted by Zonared on June 20, 2022 - 12:17am

My Apple ii used to work but I broke it

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Apple II

Apple II GS, System 6 and RAM

Submitted by HisMajestyBOB on June 19, 2022 - 4:21pm

I have an Apple II GS, ROM 1, with the original motherboard and RAM. I've tried booting GS OS via Floppy EMU and System 6.0.1 via the Apple2Online Store floppy, and each time I get the error message "RAM disk too large or not enough memory. Error = $0201."

The computer used to boot using the original hard drive with System 6 (though I could be mistaken which OS was installed), so I would think there's enough RAM to boot using Floppy EMU or an actual boot floppy. I'm reluctant to use the original hard drive until I'm ready to back it up, since it is 40 years old at this point.

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Apple II

Apple II (euro)Plus Keyboard of hell

Submitted by CedsRepairs on June 18, 2022 - 2:35am

Hello girls,

 

I don't know if my house is haunted or if I should quit this hobby, but I'm facing the Keyboard of Hell on my Apple II Europlus repair.

Or maybe the whole thing is cursed, as it's the 5th thing in a row I repair and it's not yet fully functional.

 

Anyway ; symptoms are bizarre

- Nearly EACH key I type is immediatly followoed by an underscore (a key that is not on the keyboard by the way)

- If i barely touch the cable, it registers underscores as well (I think it's like the 50Hz noise my fingers carry that make it regsiter that)

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Apple II

ProDOS, Apple ][+, and Autostart ROM Language Card

Submitted by profdc9 on June 17, 2022 - 10:49pm

I have an Apple ][+ with what I believe is the Autostart ROM Language Card.  When I try to boot ProDOS 2.4.2 date 18-JAN-18, it reports "REQUIRES 64K."  I know ProDOS places itself into the Language Card space.  Does ProDOS recognize this card as memory?  I tried to write to all of the memory locations $C080 to $C08F and I could not crash the computer while in the monitor, which I do not know if it's a good test.

Thanks,

Dan

 

 

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Apple II

snacks

Submitted by mmphosis on June 17, 2022 - 2:07pm
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