Questions tagged [apple-ii]
The Apple II series of personal computers and related software and hardware. Use [apple-iigs] for the Apple IIgs in particular, or [apple] for Apple hardware in general.
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Did any DOS 3.3 variants relocate start of BASIC?
A common annoyance when programming in BASIC on the Apple II is that 6K of BASIC storage area falls before the start of the first hires screen, with another big chunk of storage falling after it. On ...
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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 ...
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What were the differences of the various AE RamWorks cards?
Applied Engineering (AE) produced some 80-Column cards for the Apple //e that, unlike Apple's offering which only brought the machine up to 128KB, would allow a user to install up to 3MB in addition ...
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Defective Apple IIe motherboard
I have a PAL Apple IIe, put in service in 1982. Components C9, C12, C15, and C17 on the 820-0073-B motherboard are burnt out. I originally thought they appear to be power diodes, but seem to be 10 µF ...
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What's the correct Unicode code point for the Apple IIe's "delete" symbol?
I was writing an essay today about using the Apple IIe I grew up on, and I wanted to add some examples that included the "delete" symbol that was used for the cursor:
But try as I might, I ...
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Apple ][ nibble disk format specification
Is there an official specification for .nib format disks for the Apple? I'm currently debugging through a CP/M boot disk for a Cirtech //e Z80 which works fine on real hardware but fails in an ...
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Were the Apple II patents, obstacles to cloning?
The Apple II was a simple design relative to its retail price, so attractive to cloners. This naturally led to many lawsuits, at least one of which actually established new copyright law. https://en....
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How to change what program Apple ProDOS 'starts' when booting
I finally have my Apple //e booting from my SCSI2SD but I'm missing something regarding how ProDOS knows what program to start when it boots.
As I understand it, ProDOS will look for the first .SYSTEM ...
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What's the name of this Apple monitor
Browsing through retrocomputing resources, I recently stumbled upon this picture:
I'm familiar with quite a few Apple II monitors, but it's the first time I saw this one. There's an Apple logo, so it ...
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Is it possible to write unit tests in Applesoft BASIC?
It's been decades since I wrote anything in BASIC. But I'm curious: If I were to go back and start playing around with it, would my test coverage be essentially zero percent by necessity? Or is there ...
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How to read copy protected Apple II floppies / NIB images
I've got a game on Apple II 140k 5,25" floppy that does not exist in the archives yet. I would like to read it into an image. But ADTpro just shows read errors on all sectors in spite always ...
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Is it possible to detect Vertical Blanking on an Apple III
The Apple IIe, IIc, IIc plus, and IIgs had ways to detect when the video signal was in the vertical blanking period. These were:
Setting a soft-switch in the mouse interface that triggers an ...
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How do I make an Apple II disk image with the sectors in physical order?
As far as I understand:
a .do or .dsk file extension indicates that the sectors in a disk image are in AppleDOS order (i.e. the physical sectors are in order 0, 13, 11, 9 etc).
a .po file extension ...
- 1,290
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What exactly was the intent and implementation of Apple DOS 3.3's volume concept?
Inspired by this question, it got me thinking about how DOS 3.3 for the Apple II had the 'DISK VOLUME 254' at the top of every CATALOG listing. The default was always 254, but you could make your ...
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Does anybody have information on this tube?
I need to know if this is a color or monochrome tube. It’s in an applecolor A2M6020
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What is the VTOC format for an AppleDOS disk with more than 50 tracks?
I am trying to read files of an AppleDOS 3.3 disk. The documentation I've found, both from Inside AppleDOS and also from Archiveteams' website (which I believe was taken from Inside AppleDOS): http://...
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A2M6020 AppleColor monitor not showing color
When I got my Apple IIc computer, it came with an A2M6020 AppleColor 13" NTSC composite monitor. However, I have not been able to get color working on it.
I don’t know if it just has a monochrome ...
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What were the Apple II artifact colors?
A simplified version of the question in the title is "is lo-res color #1 red, or is it purple?" because that's the color that shows the most obvious variation. Color #1 was usually called &...
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Did any AppleSoft language enhancements patch CHRGOT?
Some BASIC language enhancements for Commodore 8-bit machines, such as the 1982 DOS Wedge, worked by patching the CHRGOT routine. Even though BASIC is in ROM, every byte that is fetched from a ...
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Why did ProDOS trace Applesoft?
When running an Applesoft program under ProDOS, BASIC.System watches for OS commands by looking for PRINT statements that start with Ctrl+D. This is similar, but not equivalent, to the DOS behavior. ...
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Motivation for DOS 3.3 using I/O hooks rather than ampersand-hook
AppleSoft BASIC is designed so that if it encounters an ampersand while processing a program, it will jump to address $03F5, allowing code there to examine what follows and process it suitably. While ...
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How are the randomizer values on the Apple II maintained?
Looking at a comment on this question, it reminded me of how there are two memory locations in the Apple II zero page that are used for random number generation: 0x4E and 0x4F (78 and 79, respectively)...
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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....
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Which wires need to be changed to use a Gotek floppy emulator on an Apple Mac?
Preamble
I own a Gotek floppy emulator that I use with my BBC Model B. It is the latest model with the Artery AT32F435 MCU1, so there is a lot of memory space and processing power for future features ...
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What exactly were those large orange chips on the Hayes Micromodem II interface card?
I've had a Hayes Micromodem II for the Apple ][ a very, very long time. I've seen a lot of interface cards over the years since then and have never seen anything quite like it: there are giant orange, ...
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Why would a Reset key bounce disconnect Apple DOS?
This answer stated that hitting the Apple II Reset key twice, in quick succession, could cause DOS to be disconnected from the I/O hooks. I don't understand why that would happen.
Quick background: ...
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Apple IIe problem (can’t save and load files anymore)
I recently bought an Apple IIe at an auction. It was extremely cheap but worked. I have no experience with such old computers.
I just started the computer and wrote some BASIC programs for fun. ...
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How can one do bitwise Boolean operations in later versions of Applesoft BASICs?
According to this answer, Apple changed the AND, OR, NOT operators in later versions of BASIC to perform Boolean instead of bitwise logic, so for example (1 AND 2) = 1. Which raises the question, how ...
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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 ...
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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 ...
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Apple II floppy drive, pressure pad cleaning or replacement?
This is related to the following question: Cleaning 5¼" floppy drives
Is there a proper way to clean the pressure pad that simply presses against the back side of a single-sided 5.25-inch ...
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Information about the Hollywood Hardware Graphics Card for Apple II+
I still have a Hollywood Hardware graphics card that I used in my Apple II+ back-in-the-day. It was my understanding that this was the graphics card used for the special effects in the first three ...
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I found an apple IIe without a power supply where can i find one [closed]
I found an apple IIe without a power supply where can i find one also any tips on where i can find other parts for it. Btw i know nothing about Retrocomputers.
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How to make a maximally compatible Integer BASIC (Apple II) game disk for the Internet Archive?
I'd like to get an old Apple II Integer BASIC game running on archive.org's embedded MAME in such a way that it just runs without the user having to choose anything from a menu or type any commands to ...
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Where can I find the awesome programs from Apple II's Beagle Bros's Uncle Louie's two-line programs contest?
Back in the old nostalgic 1980's there were these very cool guys making fantastic programs for the Apple II, the Beagle Bros.
Among the very cool stuff they publish there were these amazing two-line ...
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How can I get reasonably-priced APPLE-II manuals? [closed]
I am making a emulated apple-ii based on a raspberry pi and a custom chassis. I would like to have physical manuals to go along with it.
Obvious approaches are to download and print one of, or to pay ...
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Was any commercial end-user software written in PROMAL?
PROMAL is a procedural programming language from the 1980s. Its designer, Systems Management Associates, released compilers for the Commodore 64, Apple II, and IBM PC. The language and development ...
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Disk copy protection schemes for Apple II
I have a vague recollection back in the late 70s of using a wonderful program called Locksmith (from memory, so I could be wrong).
It apparently could handle all the different ways that disk-based ...
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Extensions to Apple BASIC with ampersands
I have a vague recollection of some early software that extended the Apple II BASIC language, though I'm not sure if this was Integer or Applesoft BASIC.
It provided more features for the language by ...
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Can someone make a photograph of the original Apple 1 Integer BASIC cassette?
I'm wondering if anyone here has an original Integer BASIC cassette and might be willing to upload an image of it to the wiki commons? There's a serious lack of imagery in the article in en.wiki, and ...
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Can you read the character definitions (font) in an Apple II using PEEK in Applesoft BASIC?
Can you read the character definitions (font) from ROM in an Apple II using PEEK in Applesoft BASIC? You can do this on some other computers e.g. Sinclair ZX81, Commodore 64, and Amstrad PC1512, but ...
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Commodore / Apple II GEOS Document Cross-Platform Compatibility
As I have never used Graphic Environment Operating System (GEOS) on an Apple II (only I on a Commodore 64), I have always wondered were the documents created (from programs such as GeoWrite and ...
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Could a Saturn 128K card be used as a /RAM device under ProDOS?
For starters, the Saturn 128K card was a RAM expansion card produced during the Apple ][+ era. From what I recall, unlike the later AUX slot RAM expansions for the Apple //e, it did not provide bank ...
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Apple II c repair keyboard and check disk driver error [closed]
I'm new in this forum and I want to say hello to all and sorry my bad English!
I'm trying to repair an Apple II c computer that was stored in my house for many years. When I stored it, like 15 years ...
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Copy content between floppy disks on Apple II
I own an Apple IIe with the Apple DuoDisk device. I've been trying to find out if it is possible to copy content from a floppy disk inserted into the disk 1 slot into a floppy inserted on the disk 2 ...
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How are Apple II address lines mapped to DRAM rows and columns?
The Apple II's MK4096 (4 Kbit) and MK4116 (16 Kbit) DRAM chips have
6 and 7 (respectively) address line inputs that are multiplexed: first the
row address bits and then the column address bits are ...
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Does the Apple II's non-linear frame buffer layout help DRAM refresh?
The Apple II uses non-linear frame buffers for text and graphics. Rather
than storing each line in sequence at
lines 0-23: $400, $428, $450, $480,¹ ..., $7D0
it stores them at
lines 0- 7: $400, $...
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How did Apple IIe software handle 64K bank switching?
The early microcomputers were well served by 8-bit CPUs with 16-bit address bus width, but later generations of these machines tended to run out of address space, and had to resort to some form of ...
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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 ...
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How did Apple IIc daughtercard expansions work?
I've been doing a lot of reading about the ways Apple IIc owners expanded their machines in the absence of the IIe's slots, and it's very intriguing stuff. The ones that I'm most curious about are the ...
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