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

20
votes
5answers
1k views

Why is the Amiga ROM at a high memory location, and RAM in low memory?

When a 68000 CPU powers up, it reads a few words at memory location zero to get the initial stack pointer and program counter. That suggests to me that a computer system designer would put the system ...
18
votes
7answers
2k views

Was Amiga the last of the home retrocomputers sold?

The Commodore-Amiga was offered for sale to home users from 1985 (original A1000 in North America) until 1996, when Escom stopped selling the A1200. By 1996, Apple was selling PowerPC-based Macs for ...
3
votes
2answers
264 views

How were individual bit planes scrolled on the Amiga (OCS)?

Back in my early Amiga days (A500), I remember coding simple demos that would use the dual-playfield mode and scroll them around (at a sweet 60FPS). It was pretty trivial to do with languages like ...
1
vote
2answers
221 views

Commodore Amiga 600 Software Failure. “Error: 8000 0004 Task: 000026D0”

Software Failure on Commodore Amiga 600 when I insert a floppy in drive. Software Failure. Press left mouse button to continue. Error: 8000 0004 Task: 000026D0 Independent from the floppy I ...
7
votes
2answers
463 views

Were external floppy drives for Atari ST and Amiga inter-compatible?

Were external floppy drives for Atari ST and Amiga inter-compatible? For example, Commodore 1541* had its own serial bus protocol. But what about the external 3.5" DD floppy disk drive on 23pins D-...
6
votes
1answer
175 views

What did Commodore's AppShell and AppObject do?

Among the many developed but never released software that Commodore developed for the Amiga there should be two applications, called AppShell and AppObject. What were these? Did anyone ever saw or ...
14
votes
1answer
215 views

Seeking details relating to Amiga 3000 serial numbers

I am the original owner of my Amiga 3000. As I remember it, I purchased the machine fairly early after release. I'm cleaning and detailing the machine, and I took a quick picture of the serial ...
20
votes
1answer
674 views

Why are there two, different, Kickstart 1.3 ROMs with the same 34.5 version number?

The Kickstart 1.3 ROM file that is supplied with Cloanto's Amiga Forever (amiga-os-130.rom) is very slightly different to that which you'd get by dumping a real 1.3 ROM from an Amiga 500. ...
15
votes
1answer
252 views

How to create a switchless multi-system 2 button Atari joystick?

All systems that use the Atari 9 pin joystick standard make use of the following pins in consistent ways, with each direction and the fire button being connected to the ground pin when pushed. 1 - up ...
13
votes
1answer
264 views

How do Amiga “Monitor” drivers work?

A "Monitor" driver for an Amiga is a file which, when placed in DEVS:Monitors, enables additional screenmodes. The standard PAL or NTSC driver, which provides screenmodes compatible with consumer TV ...
12
votes
1answer
363 views

Where are the blueprints of MOS chips?

Atari historians have been able to find documents and tapes of chips and hardware developed at Atari. E.g. http://atariage.com/forums/topic/154479-new-gtia-chips/ . Nothing like this is happening ...
3
votes
0answers
104 views

Can't type angle bracket characters in AmigaOS 4.1 on WinUAE

Has anyone else experienced that when running AmigaOS 4.1 inside WinUAE that they can't type the < or > characters? I have a mostly bog-standard American QWERTY keyboard, no special emulation ...
8
votes
1answer
354 views

Why was Windows 3.1 so dreadfully slow on an Amiga A2286 bridgeboard?

Back in the day I had an Amiga 2500/30 with an A2286 as my "swiss army knife" home computer; not only did I have the ability to run MacOS (ShapeShifter) at native speed, but the 8MHz 286 bridgeboard ...
24
votes
1answer
1k views

How do Amiga 600 CPU accelerators work?

The Amiga 1200 has a trapdoor expansion for CPU accelerators. The Amiga 500 has a side expansion port and its CPU is socketed. But Amiga 600's expansion port is only useful for memory expansion ...
5
votes
2answers
245 views

How to create fast an icon file for Amiga program in WB drawer?

I have copied one program from a floppy to a hdd drawer (I created for it) and I want to start this program directly, without going through Window -> Show -> All Files first in my Amiga ...
4
votes
3answers
520 views

Amiga memory bandwidth

Looking at a timing diagram for the various kinds of memory access occurring on the Amiga http://amigadev.elowar.com/read/ADCD_2.1/Hardware_Manual_guide/node02D4.html it seems to be saying that video ...
6
votes
1answer
182 views

How to integrate an 512kB EEPROM on a A3660 accelerator board at $00F00000?

I am currently experimenting with Chucky's re-engineered A3660 accelerator board for the Commodore Amiga (3000(T) and 4000(T)). My ultimate goal is to add an additional 512kB EEPROM to the ...
13
votes
3answers
1k views

How can you connect an Amiga 500/600/1000/2000 to a modern monitor?

I have an Amiga 500 that I'd like to get up and running again, but the 1084 monitor with which I used to use it has flyback transformer issues. What options are available to hook it up to a modern ...
19
votes
1answer
4k views

Why do all the Speech Synthesizers have that same Voice?

The first time I ever played with software speech synthesis on a microcomputer (not hardware synthesis, like in TI's Speak & Spell) was around 1983, using S.A.M for the Commodore 64. A year later,...
5
votes
2answers
353 views

Transistor count of copper and blitter

According to https://en.wikipedia.org/wiki/MOS_Technology_Agnus the Agnus, one of the three custom chips in the Amiga, that included the copper and blitter among other functions, contained a total of ...
4
votes
1answer
195 views

Identify this Amiga game: It's just like Rocket League

I remember playing an Amiga game which was very similar to Rocket League, subject to the technology of the time. It was a two player game with a top-down 2D playing area. There was a large puck ...
7
votes
2answers
126 views

Question about external Gary NAND driving _BLIT in depency of _ROMEN

what is the meaning of the NAND external connected driving _BLIT in depency of _ROMEN? I cant see the need mainipulate _BLIT by accessing the ROM. Is this an Gary bugfix? Strangely A500+ does not have ...
19
votes
4answers
2k views

How did the Amiga 500 left-side expansion port work?

On the Amiga 500 there is an expansion port How did the expansion port work?
4
votes
1answer
148 views

Amiga ed removes flags

Recently I noticed a strange behavior when editing startup-sequence with ED. Unless I call protect startup-sequence rwed before editing it, ed says unable to write the file. Saving the file ...
6
votes
1answer
155 views

How do specify drives to mount when Amiga 1200 starts up

I have an Amiga 1200 with an SD card and Classic WB installed. I have four drives DH0, DH1, DH2, DH3, when I start the machine with workbench it mounts all devices. If if start the machine using skip ...
0
votes
1answer
232 views

Amiga 500+ does not start up [closed]

Amiga 500+ does not start up. It has been offline for a considerable amount of time. The machine powers up but does not move from that point. I have inserted the workbench disk. Can anyone advise the ...
9
votes
1answer
189 views

When did Great Valley Products, stop producing hardware?

I had a GVP 68040 card in my old Amiga 2000 (ah those were the days). 25Mhz 68040, 16MB of RAM, SCSI controller to my 750 MB SCSI drive (if that was even 3200rpm I was probably lucky) and it was SO ...
8
votes
3answers
441 views

What limits Amiga 68030/40/60 accelerators to 256 MiB of RAM?

Even today there are companies that still make accelerators for the 68000-based Amigas, but I've never seen any such accelerator with more than 256 MiB of RAM. If the 68030+ can address 4 GiB, then ...
0
votes
0answers
63 views

WinUAE, create a hard disk image of only boot partition?

If I have my CF Card connected in WinUAE, I am only able to create a hard disk image of the full 8GB. Is it possible to only image the boot partition? Thanks
5
votes
1answer
214 views

Should I start Amiga's copper list using COPJMP1 or is it superfluous?

According to the documentation I have ("Hardware" by J.Schimanski) after setting the copper list COP1LCx under $dff080 it should be started by writing an arbitrary value into COPJMP1 under $dff088. ...
9
votes
2answers
246 views

Version Control for AmigaOS 3.1

I owe my career as a software developer to the Amiga. I might have learned the basics of programming on the Apple II+ and Commodore 64 - but on my Amiga I learned skills I've applied to my whole ...
11
votes
1answer
579 views

Practical differences between the three Amiga 500 rev 5 motherboards?

The Big Book of Amiga Hardware lists three different versions of the Amiga 500 rev 5 motherboard which it names Type 1, Type 2, and Type 3. Were the changes made only to simplify manufacturing, or ...
6
votes
1answer
172 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
454 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
385 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?
41
votes
6answers
3k views

Are there any modern compilers that can generate Amiga/m68k executables?

I would quite like to resurrect my openkick project. As I note on that project's README.md, it is stalled because GNU GCC is not fit for purpose. Sadly, there do not seem to be any other modern ...
11
votes
2answers
462 views

What information is encoded in the 22-digit barcodes on the Amiga's case?

What information is encoded in Amiga's 22-digit barcodes? For example: 0103791363642010121234
4
votes
2answers
498 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
719 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-...
10
votes
3answers
227 views

Will using a clockport RTC card on an Amiga 1200 clash with the RTC on an accelerator card?

I have an accelerator card fitted to my Amiga 1200. The accelerator includes a real-time clock, but I noticed that the soldered-on rechargeable battery was in danger of leaking, so I cut it off before ...
9
votes
4answers
2k 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 ...
14
votes
2answers
951 views

Creating a new language support for AmigaOS

Looking through the LO (localisation) disk for Workbench 3.1, I see that the language files are binary. I'd like to create a Gaeilge (Irish) localisation file. How is this done on Amiga? Update: ...
11
votes
2answers
335 views

What interface did Video Backup System use?

I remember the Video Backup System for Amiga advertized in Polish computer magazines of late 90s, "store hundreds of diskettes on a single VHS tape!" I seriously considered buying it (and a VCR since ...
9
votes
1answer
216 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 ...
24
votes
4answers
4k 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 ...
19
votes
3answers
1k views

Why does MP3 audio decoding overwhelm retro CPU's?

Many retrocomputers from the late 80s and early 90s had audio DAC hardware support. This includes the Amiga, Classic Macintosh, and PC's with SoundBlaster add-on cards. Despite the fact that the MP3 ...
7
votes
2answers
317 views

Amiga Video Toaster support

What features of the Amiga chipset architecture and/or Amiga OS made it possible to design the Video Toaster run on the Amiga? Why weren't there similar (cost-effective) video products for the PC or ...
10
votes
1answer
332 views

What is the relationship between Amiga audio and the MOD music file format?

What is the the MOD music file format? Exactly how does it relate to the Amiga 1000 audio hardware? Did the MOD format become popular on non-Amiga computers? If so, why?
7
votes
2answers
401 views

Why did Commodore not upgrade OCS straightforwardly to 32-bit architecture?

This is somewhat of a speculative question... Amiga's 1985 Original Chip Set is inherently a 16bit architecture (the data bus is 16bit, registers are 16bit, the blitter itself is 16 state machines ...
53
votes
6answers
6k 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 ...