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For questions related to the Apple IIgs computer.

4
votes
0answers
101 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
104 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
827 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
472 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
219 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
213 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
534 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
183 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
973 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
270 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
172 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
152 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
498 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, ...