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Questions tagged [apple-iigs]

For questions related to the Apple IIgs computer.

4
votes
2answers
131 views

Can you replace an Apple IIgs battery with regular AA alkalines?

I have a IIgs that I clipped the battery out of a few years back. I'm thinking I want to replace a battery in there, but before I spend money on a product like this one, I'm trying to figure out if I ...
14
votes
1answer
801 views

How does Apple ][gs hardware dithering work?

I haven't been able to find an easily comprehensible description of the super hi-res, dithered 16-color, 640x200 mode of the Apple ][gs. I can tell from the references I did locate, this is a ...
10
votes
1answer
637 views

Help identify old Apple game from 80s (Apple II, Apple IIGS)

I am trying to remember the name of a game I played on Apple II or Apple IIGS. From what I can remember, the beginning of the game you are looking for your lost uncle or something. You to another ...
4
votes
0answers
119 views

How to use IIgs enhanced graphics modes in AppleSoft BASIC with System 6?

There are many packages that let you use the enhanced graphics modes of the IIgs in AppleSoft BASIC. However most packages like Iconix do not like System 6 so they have to run off disks and not the ...
3
votes
1answer
113 views

What is stored in IIgs PRAM?

What is stored in the IIgs PRAM? I'm going to replace my PRAM battery in a ROM 03 IIgs and that got me thinking about what is stored in PRAM. I know that date and time are stored, but not if all the ...
16
votes
1answer
874 views

Apple IIgs: Hardware implementation of RAM shadowing

On the Apple IIgs, the 256K of built-in main memory is divided into two sections: The "fast" RAM, banks 00 and 01, and the "slow" RAM, banks E0 and E1. CPU access to slow RAM required the CPU to slow ...
8
votes
2answers
589 views

Apple II GS versus Mac Plus cost

I just came across a fascinating video https://www.youtube.com/watch?v=7h4tepFbMso&t=78s which makes a coherent case - I don't feel I can pass a final verdict on whether he's right or wrong, but a ...
15
votes
5answers
3k views

Reason for popularity of Apple IIGS

According to https://en.wikipedia.org/wiki/Apple_IIGS the Apple IIGS, in its year of introduction, outsold the Macintosh, without being substantially cheaper than it. This is somewhat counterintuitive:...
7
votes
1answer
270 views

How can I tell if an Apple II disk image is bootable?

I have around 500 floppy disk images from an Apple II and IIgs BBS/usergroup that closed down recently. Some of the disks are bootable, but many aren't. Is there an easy way to tell if a disk boots ...
6
votes
2answers
247 views

Checklist for powering up an Apple IIgs?

I've just been given an Apple IIgs that hasn't been turned on since 1999. What's a reasonable set of checks to go through to make sure I don't toast the thing the first time I plug it in? The machine ...
12
votes
1answer
638 views

How did Apple's 'CYA' chip function to “Control Your Apple”?

Unlike the original Apple ][, the Apple IIGS was built from highly-integrated custom chips. Among these were the Mega II and the CYA (which, apparently stands for "Control Your Apple"). From what I ...
6
votes
1answer
202 views

How many cards can safely be put in a IIgs?

The Apple IIgs can have the usual seven cards an Apple II can have plus RAM which has an additional slot. Other devices can end up inside the IIgs such as an adapter for the Game I/O socket or the ...
8
votes
3answers
1k views

What is the maximum amount of memory that can be added to an Apple IIGS?

I thought it was 4 Megabytes but I can see there are 8 Megabyte expansion cards. Is that the maximum? And is that an addressing/bank limit or a limit of the slot?
13
votes
1answer
291 views

What FSTs (File System Translators) exist for the Apple IIGS?

Apple supplied some, were there others that other people wrote? What is the complete list of FSTs available?
12
votes
1answer
182 views

Inserting NOPs to improve IIgs shadow copy performance

The answer to this question discussed a technique on the Apple IIgs for copying memory onto itself. The motivation for the technique was to maximize use of "fast" (2.8MHz) RAM over "slow" (1MHz) RAM ...
6
votes
2answers
171 views

How do I interpret the old Mac character set?

Older Macintoshes and the Apple IIgs used a custom character set for documents and filenames. Each character was held in an 8-bit byte, using 0x00-0x7F for ASCII, and 0x80-0xFF for various symbols ...
21
votes
2answers
524 views

How do I use shadowed memory to render Super Hi-Res quickly?

The Apple IIgs video memory is controlled by the 1MHz Mega II chip, so directly accessing the Super Hi-Res page in bank $E1 is slower than accessing other memory. How can I render in "fast" memory, ...