All Questions
10 questions
7votes
2answers
1kviews
Help understanding TAIPAN source code for the Apple II
I am trying to run the source code found at https://taipangame.com/BASIC.txt on Epple 2 (with Apple II+ roms) to eventually run on my own Apple II+, but the program keeps crashing. First, I used a ...
6votes
2answers
349views
6502 Assembly on Apple IIe: GETLN fails with 'syntax error' under ProDOS
I'm writing a text adventure in assembly for the Apple IIe (using Merlin). I'm also using ProDOS 8 v2.0.3. At some point, I have a subroutine to read user input from the keyboard using the GETLN1 call....
0votes
1answer
348views
Apple II mixed mode cursor placement
I've been playing on my recently resurrected Apple IIs, a //e, IIc, and IIgs (mostly the //e), tinkering with assembly. I'm reading the paddles and plotting a colored block on the screen, kind of an ...
- 93
8votes
2answers
2kviews
Asking explanation of 65C02 assembler code
From Gary B. Little's "Apple ProDOS: Advanced Features for Programmers", pages 176 - 188: "Since the ONLINE command handler is not inherently relocatable, all references to internal ...
- 93
5votes
1answer
409views
Apple II Assembly DSECT
I'm trying to define a section of data in a program. The Apple 6502 Assembler/Editor mentions an assembler directive called "DSECT" but I can't tell if I'm using it correctly or not. Here is ...
- 53
7votes
3answers
2kviews
Apple II Toggles between 40 and 80 columns in assembly language (Apple IIc)
To switch from 80-column to 40-column display, what is the difference between the following two actions: lda #$11 jsr COUT ; $FDED and sta $C00C ; 80coloff switch In the first case, I do not ...
- 193
4votes
1answer
324views
Apple IIc : displaying HGR page 1 in AUX memory
I need to display HGR page 1 ($2000 to $3FFF) located in AUX memory (not in MAIN memory). According to the "Apple IIc Reference Manual - Volume 1", page 45, I must first turn 80Store on by ...
- 193
6votes
3answers
450views
Apple II: ProDOS, zero length prefix and MLI calls
I have a simple program on my Apple IIc written in assembly language. It starts by getting a filename from the user (just the file name, not the full path), then it opens the corresponding file with a ...
- 193
3votes
3answers
786views
How to transfer the address of a data block into zero page using the Merlin 8 assembler on my Apple //e?
I've been fooling around with the Merlin 8 (v2.58) assembler on my Apple IIe and ran into a small snag. Basically, I would like to load the address of a block of data into a two-byte pair in zero ...
- 10.4k
11votes
2answers
2kviews
Best learning path for Apple IIe assembly language [closed]
I have an emulator up and running and access to the asimov ftp site, and I want to learn how to program assembly language on the Apple IIe. What assembler should I use (Merlin? LISA?) and what book or ...
- 133
