Questions tagged [amiga]

For questions related to the Commodore Amiga family of personal computers.

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7
votes
1answer
282 views

What is the necessity of the Signal BLS (Blitter SLow)

I am trying to understand the Amiga schematics: Question 1: What is the necessity of the Signal BLS (Blitter SLow) generated by A2000A U26 or Gary in the A2000B? Question 2: BLS is also set by ...
15
votes
4answers
1k views

Appropriate battery replacement for my A3000

I know the interwebs are full of information relating to the replacement of batteries for various computers, and the Amiga's are no different. But before I do anything rash, I wanted to ask for some ...
6
votes
1answer
1k views

Start application after Amiga Workbench 1.3 boot sequence

I want to start an application after the boot sequence of Workbench1.3: In my case an Amiga Shell application: Where are the startup files located and what are the changes to provide this?
5
votes
2answers
1k views

How hard would it be to port Amiga OS4 to x86 or ARM?

This question was raised on Facebook a few hours ago. Some say it's possible, others say impossible. What do you experts say?
10
votes
3answers
1k views

Can artifact color mode create 262,144 colors on Amiga OCS?

This is as a follow-up to my previous question on artifact colors and the excellent answers provided there. The images below show a simple example of artifact colors generated using a single bit-...
15
votes
4answers
6k views

How do I attach and use a CD-ROM drive to an Amiga?

I would like to add a CD-ROM drive to an Amiga. I have not tried this for several years and I remember things failing to work without giving any useful errors, multiple choices of device and ...
10
votes
1answer
463 views

What was the difference between the original Video Toaster and the 4000 version?

There were two versions of the Video Toaster hardware: an original one designed for the A2000 and a later one designed for the A4000 which was suitably called the Video Toaster 4000. While I can ...
28
votes
4answers
12k views

Can I image Amiga Floppy Disks on a Modern computer?

Is there any way of reading Amiga floppy disks to PC hard-drive? Can I use a standard Floppy drive with a firmware program that will translate it? Do I need an external drive or a working Amiga ...
58
votes
6answers
8k views

Reason for the Amiga clock speed

The Amiga used a CPU rated for 8 megahertz, but clocked at 7.14 megahertz. What was the reason for this number? I remember it was something to do with a multiple of the frequency of the video ...
11
votes
2answers
572 views

What's the meaning of __saveds in Amiga C code?

What's the meaning of __saveds in Amiga C code? It's applied to function prototypes, and is required for functions that are to be called by assembler code, if I understand correctly.
12
votes
2answers
994 views

How does the Amiga chipset RGA bus work?

The RGA bus is the bus that connects Agnus/Alice with Denise/Lisa and Paula. What is it used for? I guess at a minimum to write/read registers in Denise/Lisa and Paula, and I guess to feed data to ...
16
votes
2answers
3k views

How does the Kickstart ROM load and start workbench?

As I understand, on the Commodore Amigas, the kickstart copies itself into a region of memory which is later made read-only. Does kickstart also copy workbench into this region? How does kickstart ...
18
votes
1answer
2k views

Was it possible to get more than 8 sprites per scanline on an Amiga with the copper list?

I've read in the past that it was possible to overcome the 8 sprites per scanline on the Amiga (OCS) using the copper list. However, I can't seem to find any actual references to what may have used ...
11
votes
2answers
407 views

What happens when a floppy track contains multiple sync words?

This question is specifically aimed to the Amiga hardware. Let's assume a floppy track is read via DMA using sync word to trigger the start. Let's also assume the track contains the sync word ...
20
votes
2answers
2k views

How are Amiga libraries structured?

In this Crash course to Amiga assembly programming, the author loads A6 with a constant, and then regularly jumps to offsets from that constant. He explains: All functions within that library can be ...
9
votes
3answers
2k views

Replacing Amiga 9 pin D-Sub mouse cable

I have an original Amiga "tank" mouse, the PCBs are good, but the cable is clearly faulty as the Y axis and left mouse click doesn't work when it is tilted to the right. I need to replace the cable ...
11
votes
2answers
521 views

Official explanation for offering both BOOPSI and GadTools?

Was there ever an official explanation on why AmigaOS 2.0 offered two similar GUI gadget toolkits, in the form of BOOPSI and GadTools? Or, to put it in another way, why were not GadTools gadgets ...
5
votes
0answers
146 views

Can a modern 1.44MB floppy drive work with an Amiga 2000? [duplicate]

Can an Amiga 2000 (or even A500) be made to easily work with modern 1.44 MB drives? Meaning, is it just a matter of pin mappings or are the drives just too incompatible? I realize there are other ...
17
votes
1answer
2k views

I've taken my Amiga computer out of storage after several years and it doesn't work. What's the likely cause?

I've had an Amiga on a shelf for a long time. Today I took it down and tried to use it but it's not working. There's some basic activity - the power LED illuminates, and there is a video signal - but ...
17
votes
4answers
2k views

Is there a Linux client for Amiga Explorer?

I have some Amigas that I would like to be able to transfer files to/from using my primary desktop machine, a PC running Linux. My Amigas do have CrossDOS installed, but transferring things in 720K ...
9
votes
1answer
1k views

How do I add multiple internal drives to an Amiga 2000?

The default configuration of an Amiga 2000 has a single internal floppy drive. Can I add a second internal floppy drive? Can I add a third or fourth drive too?
10
votes
1answer
562 views

Why would a PAL Amiga sometimes start up in NTSC display mode?

For an OCS Amiga (Workbench 1.2 or 1.3) I remember sometimes after a Guru Meditation/software failure reboot, Workbench would be restricted to NTSC size displays (200 non-interlaced vertical lines in ...
11
votes
3answers
2k views

What advantages are there to replacing Kickstart 3.0 with Kickstart 3.1?

I have an Amiga that has the Kickstart 3.0 ROMs installed. What advantages are there to replacing the Kickstart ROMs with 3.1? Is there any software that requires Kickstart 3.1 to function?
11
votes
1answer
791 views

How did the Amiga 1000 WCS (write controlled store) for Kickstart work?

Most Amiga computers have Kickstart (the core of the operating system) on ROM. But the original Amiga 1000 instead loaded Kickstart from disk. It had boot ROM that would run some self tests and then ...
13
votes
1answer
583 views

What does Personal Paint documentation actually refer to by “unmaskable interrupt” for its “crash protection feature”?

Personal Paint was a gfx program for Amiga that introduced many novel concepts, some quite ingenious, some... controversial. Among all, it had a "crash protection" feature, that was meant to enable ...
19
votes
1answer
2k views

Change Amiga Shell keyboard layout in Workbench 1.3

I'm using Workbench 1.3 in Amiga 500. I managed to change the Spanish keyboard in "SetMap", as shown in the following figure: And I can write text with special spanish characters (ñ,ç,ó,á,...) from ...
12
votes
2answers
563 views

What did disk-validator do?

...besides relabelling the disk to 'Lazarus' and helping the Saddam virus spread? I know it was supposed to 'fix' corrupted disks that were ejected during a write operation. I don't think I've seen a ...
15
votes
1answer
2k views

How could Amiga computers play 14 bit sound?

The "Paula" chip used for sound output in all Amiga computers had 4 8bit sound channels (arguably comparable to 9bit stereo). There were programs/libraries which could play 14bit stereo on the Amiga ...

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