Apple II

Looking for one ii plus short Alps keyswitch

Submitted by mochatea396 on January 5, 2023 - 9:27pm

Hello group,

Would any member have a good short Alps keyswitch for a ii plus they’d be willing to part with? These are the ones with the cream colored stems.  I don’t even care if the switch is working, I just need the stem.

Thanks

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Replacing NiCad battery on Timemaster HO cards

Submitted by skate323k137 on January 3, 2023 - 1:07pm

Hello all,

 

I have a couple Timemaster HO cards with the original Data Sentry branded NiCad batteries sodlered on. One of the PCBs appears to have fared pretty well, with just a little corrosion on the solder pads. The other though appears to have some trace damage perhaps from the battery leaking.

 

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Apple II

Apple2 memory map for Cubbyhole optimizations?

Submitted by Harry Potter on January 2, 2023 - 9:13am

Hi!  When I program in cc65 C, I usually use an optimization technique.  It states that I can use parts of the OS's memory, a.k.a. Low memory, that aren't used during the course of a cc65 program can be used for a program's code and data.  I like this technique, as it buys me a little extra space.  AFAIK, the range from $0200-$02FF is used to read a line of keyboard input and can be used if a program doesn't use the ROM's routines for such, and the range $0300-$03FF is used by DOS 3.3 and is available when using ProDOS.  Am I right?  Where can I find a memory map for the Apple2 series?

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Apple II

wDrive not working & teardown

Submitted by djc6 on January 2, 2023 - 12:01am

I have a ROM3 IIGS and I wanted a wDrive to complement my BOOTI card for track/sector ordered disk images, which the BOOTI card doesn't support. The thing that intrigued me about the wDrive vs Floppy Emu is that the wDrive has a menu system you can use via the computer's monitor & keyboard, versus having to look at the tiny OLED display. Not a fan of the tiny OLED on my Pi1541 for my C64.

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Apple II

Happy New Year

Submitted by magnusfalkirk on January 1, 2023 - 12:03pm

Happy New Year to all the members of Applefritter! Hopefully everyone had a safe and enjoyable New Year's celebration. Here's to an Apple II rich 2023!

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Apple II

Apple2 control characters?

Submitted by Harry Potter on December 31, 2022 - 4:07pm

Hi!  A while ago, I ported some cc65 code from CBM to Apple2.  While I was porting the code, I forgot to clean up the control characters, and the results were random attribute changes, i.e. inverse characters and a switch back to 40-column mode.  This leads me to believe that, like the CBM models, the Apple2 also had control characters.  Where online can I find a list of Apple2 control characters?

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Apple II

Help identifying a game

Submitted by tony359 on December 28, 2022 - 12:04pm

Hi all

 

I need your help in identifying a game I used to play when I was a kid - I am assuming it was on the Apple //e, I hope I am not mistaking it with my friend's C64.

Memory is blurry but it was played on different levels, all shown on screen as "floors". You could use some lifts to go from one level to another. If not mistaken you could walk "out of the screen" and another whole set of floors would appear.

The lifts used to make some weird noise and, as a kid, I was a bit scared by that! Maybe it's incorrect but robots were involved?

 

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Apple II

LZ77: trying to understand hash tables...other ideas?

Submitted by Harry Potter on December 26, 2022 - 2:44pm

Hi!  I'm trying to understand hash tables.  From what I understand, every time I process a string of data, look for the first four bytes in a hash table.  If a match is found, scan starting there for a better match.  If only the first two or three match, scan to there, as I do better on smaller offsets.  If the match is at least four bytes, add it to the hash table.  I thought of a derivative: keep an 8k array of bits, where each bit determines if an associated word was used.  If a word in the input was not already encountered, skip the LZ77 scan.

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Apple II

Help needed debugging text adventures!

Submitted by Harry Potter on December 26, 2022 - 11:47am

Hi!  I'm working on a text adventure for the C64 and two text adventure codes for cc65 around which others can build text adventures.  The latter includes a version for the Apple3enh.  I fixed the bug with the former while optimizing, but the latter still have the bug.  :(   The bug is mainly displaying garbage for room descriptions and some other texts.  The programs are called AdvSkel65 and AdvSkelVic65 and can be found at c65 additions - Manage /game at SourceForge.net.  It seems to happen when the printtok() function i

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Apple II

Need to Downsize the Collection

Submitted by jwg1962 on December 26, 2022 - 10:09am

So I went down to the basement to start working on some projects that I have been saving all year for our Christmas break and have finally realized as I am getting older and collecting more and more projects, that I now have enough projects to work on well past my 100th birthday.  (I am 60 now, so that's about 40 years worth. :-) LOL!)   It hit me that I now need to prioritize them and start letting some of them go, so that others may share in the joy of restoring vintage Apple equipment.   So far this break I have: 

 

-  Recapped 34 Macintosh LC power supplies.  

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