Questions tagged [amiga]

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

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6
votes
1answer
267 views

Why does my Amgia 3000 show no Fast RAM even though the ZIP sockets are populated?

I am trying to get an Amiga 3000T up and running, all seems good but there's no Fast RAM. All Zips ard populated. Is there any (easy) way to test the ZIPs? Also, could something like a bad cap kill ...
3
votes
1answer
393 views

Is the 3000T's case made by Commodore, or was it stock from elsewhere?

Is the 3000T's case made by Commodore, or was it stock from elsewhere? I need a side panel for one.
14
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2answers
773 views

Can I trigger the Amiga ROM debugger from the boot prompt?

Suppose I have an Amiga computer without any working boot disks. Is it possible to trigger the built-in ROM monitor (RomWack or SAD, see https://theamigamuseum.com/amiga-kickstart-workbench-os/guru-...
13
votes
2answers
1k 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 ...
11
votes
1answer
773 views

Any Issues with running Workbench 1.3 on a Kickstart 1.2 Amiga 500?

I own a fairly early Amiga 500 with Kickstart 1.2 ROMs, Commodore Logo key and the OCS Agnus 8371. Is this system completely compatible with Workbench 1.3? Or does WB 1.3 require Kickstart 1.3 ROMs? ...
11
votes
3answers
1k views

Set keyboard layout in Amiga Workbench 3.1

I did a fresh install of the Cloanto amiga-os-310-install.adf disk to a hard drive, and then I wanted to change the keyboard layout to Swedish. I tried SYS:System/SetMap s but then I've learned that ...
14
votes
1answer
945 views

Does the Commodore CDTV-CR contain a 65C02 for some reason?

Browsing around the FS-UAE source code I discovered a 65(S)C02 emulation core, which appears to not be referenced anywhere outside of some CDTV-CR related source file. Apparently, a CDTV is ...
7
votes
1answer
441 views

Digital PCB Plans for Retro Computers

I use software like Fritzing or Autodesk EAGLE to draw my Raspberry Pi or Arduino projects and was wondering if there is a source for PCB plans of for example an Amiga 500 in a format readable for ...
11
votes
3answers
817 views

What are the Ultra-Highres registers in ECS and AGA for?

The Amiga custom chip set, in its ECS and AGA versions, seems to contain some registers for what is called an "Ultra-HighRes/DUAL" mode: DFF078 SPRHDAT W Ext. logic UHRES sprite pointer and ...
11
votes
3answers
5k views

Amiga-looking keyboard for PC

I would like to use an Amiga-looking keyboard on my PC. (I prefer not to use my old original A2000 keyboard with an adapter, partly because it lacks many keys present on modern 105-key keyboards, and ...
24
votes
10answers
4k views

Why was hardware diversification an asset for the IBM PC ecosystem?

The IBM PC was cloned very early on, and many third parties made hardware peripherals. This required users to run an OS, install drivers, manage IRQs and hardware bus addresses, etc. Why was this a ...
17
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2answers
869 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 ...
8
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2answers
2k views

What is this side-scrolling fighting game for the Amiga?

I remember playing this game on an Amiga. I have no idea what it was called.
8
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0answers
407 views

What are all the patches that SetPatch applies to Kickstart?

SetPatch runs as the first command in the Startup-Sequence when Amiga boots up. It applies patches to the code in ROM to fix bugs and also enable features if necessary. For example, I seem to remember ...
13
votes
3answers
2k views

Was there ever a Kickstart that took advantage of 68020+ instructions that would work on an A2000?

Back in the day with my A2500/30, I always wanted to get the 68030 versions of software if I could because presumably I'd be able to get a few percentage more performance in some cases. However, I get ...
54
votes
7answers
7k 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 ...
13
votes
2answers
708 views

What are all the fixed addresses of AmigaOS?

I was reading Richard Downer's excellent response about how Amiga libraries work and one sentence in particular got my attention: Yes, a pointer to exec.library is always at $4, and this is (in ...
8
votes
2answers
989 views

How to troubleshoot Amiga 600 power issue?

I have an A600 Rev 2D (schematic), which is dead as a doorknob. It was that way when I acquired it some years ago, and it's mostly been in storage since. Between the 5V rail and GND I measure a low ...
3
votes
2answers
2k 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 ...
29
votes
1answer
2k 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 ...
17
votes
2answers
1k views

What should I do when some of the keys of my Amiga 600 have stopped working?

I opened up an Amiga 600 to install a hard drive, and after reconnecting the keyboard ribbon and powering the computer up, at least one column of keys no longer works. What did I do wrong and what ...
13
votes
2answers
872 views

Protected/virtual memory support in classic AmigaOS

It is a well-known fact that AmigaOS is a single address space, totally unprotected memory operating system. The original implementation ran on a Motorola 68000, that did not support virtual memory if ...
8
votes
2answers
3k views

Repairing/Lubing/Fixing Amiga 500 floppy drive

I have acquired an Amiga 500 that seems fully functional, but the floppy disk drive seems to have mechanical issues. I could get it to read a few floppy disks until the last one wouldn't pop out when ...
6
votes
2answers
772 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 ...
13
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3answers
5k views

What is the benefit of increasing Amiga chip memory?

For example, an Amiga 500+ has 1MiB of chip memory, but it can be expanded to 2MiB. What would be the advantage?
8
votes
1answer
329 views

Are there any trapdoor slot video cards for a non-tower Amiga 1200?

Are there any trapdoor slot video cards for a non-tower Amiga 1200 ? (That excludes Zorro expansion cards, PCI mediator cards and BlizzardPPC+BVision - as all of those require tower case, also ...
30
votes
1answer
4k views

What are the Amiga 1200 timing fixes?

I have read that the Amiga 1200 may need certain "timing fixes" to be applied to the motherboard in order to use CPU accelerators. What are these timing fixes and why are they needed? Is there one ...
11
votes
1answer
814 views

HxC floppy emulator on Amiga 1200, second virtual drive disappears after reboot

I've recently purchased a HxC/Lotharek SD Card floppy drive emulator. It's working well replacing DF0: but I'm seeing some odd behaviour with its emulation of DF1:. On the first boot after power-up, ...
16
votes
2answers
3k views

Booting an Amiga 1000 directly to the hard drive without Kickstart floppy

The Amiga computers such as the Amiga 1000 required a Kickstart floppy to be able to boot directly into a hard drive. I have a Amiga 1000 as well but missing the Kickstart floppy. I would like to ...
9
votes
0answers
569 views

How many Amiga 3000's were produced?

While revisiting this question: Seeking details relating to Amiga 3000 serial numbers I began to wonder how many actual Amiga 3000's were produced by Commodore. I suspect (like most production ...
15
votes
1answer
855 views

What is the Kelly chip?

The Amiga 3000+ DevCon 1991 notes says: On the A3000+, these resources include the Amiga "Pandora" chip set (Alice, Lisa, Kelly, and Paula), However, a Kelly chip is not part of the official ...
9
votes
2answers
540 views

How many gates does each chip in OCS have?

According to Wikipedia, the original Agnus has 21000 transistors. How many gates would this be? (assuming there's a straightforward way to convert between gates and transistors). What about Denise, ...
1
vote
1answer
1k 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 ...
10
votes
1answer
917 views

Amiga 500+ rev8A, 1 MB chip RAM and 0.5 MB slow RAM

I have an 500+ rev8A, I added the missing 0.5 MB RAM and the U32 to the motherboard. I also have 512 KB in the trapdoor. This results in 1.5 MB chip RAM; but I want to have 1 MB chip RAM and 0.5 MB ...
14
votes
3answers
612 views

Who invented scrollable screens in Amiga?

A well known feature of Amiga is the ability to have multiple Intuition screens (ViewPorts in graphics.library parlance) that coexist and can be laid out on the screen so that they overlap vertically. ...
8
votes
1answer
877 views

What was Burst Mode on the 68030 and why didn't the A2630 support it?

Inspired by this question, I'm curious what burst mode was on the 68030 and why wasn't it supported on the A2630 accelerator card commonly found in the Amiga 2500/30? I had one of these machines and ...
9
votes
2answers
377 views

How did the Amiga uses compare to uses for other personal computers in 1985? [closed]

The Amiga 1000 came out in July 1985. This was an era in which personal computers were designed by their manufacturers to meet a unique set of bespoke requirements. For example, some computers came ...
7
votes
1answer
388 views

Which Amiga systems did access RAM with fast page access?

I'm pretty sure Chip and Fast RAM access on an Amiga 1000 does not support FPM access. Which Amiga system, chipset or motherboard "glue logic" first introduced FPM access to Fast RAM? Which one to ...
16
votes
2answers
1k views

Creating a new locale.library 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: ...
7
votes
1answer
336 views

How do you open an Amiga A590 Power supply?

I have an Amiga 590 hard drive, but the power supply appears to be dead on it so I want to take a look inside. I have removed three screws from the underside but it still won't open, acting like there'...
14
votes
2answers
636 views

What is the minimum set of Kickstart kernel modules to allow an Amiga to boot?

Amiga OS resident modules (libraries, devices, etc...) are location-agnostic, in that it is technically possible to compile them as location-independent code to be loaded at runtime from disk, or to ...
13
votes
3answers
4k views

Extended ROMs on the Amiga CD32 and CDTV

Continuing my series of questions about Amiga ROMs :-) The Commodore CDTV contained a normal Kickstart 1.3 ROM, plus an "extended ROM". From http://www.l8r.net/technical/cdtv-technical.html: The ...
12
votes
2answers
1k views

What was the A1200 Flash ROM support meant for?

Question inspired by this answer's last paragraph: https://retrocomputing.stackexchange.com/a/1307/2155 The Revision 1 A1200 schematics show that the system originally had support for a two internal ...
33
votes
1answer
2k views

How did the Amiga DCTV work

This is an unusual question since I'll answer it right away because it was a truly unique device and there is absolutely nothing about the technology it used on the internet. I spoke with the hardware ...
6
votes
3answers
469 views

Opening or converting GFA Basic files to something readable?

There is a bunch of GFA BASIC for Amiga files (the source code for Blender's ancestor, Traces, downloadable here: http://zgodzinski.com/blender-prehistory/) that I would like to peek at. Despite my ...
6
votes
1answer
330 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 ...
3
votes
1answer
603 views

When were other inexpensive computers able to recreate "The Amiga Juggler"? [closed]

The Amiga Juggler was the 2nd very popular demo to appear for the Amiga Computer early in its lifespan. The demo was created by Eric Graham (who went on to develop Sculpt3D) using raytracing to both ...
13
votes
2answers
2k views

What exactly are the differences between Kickstart 1.2 and 1.3?

The only very known difference is that Kickstart 1.3 fixes the silly bug that prevented Kickstart 1.2 to boot from a hard disk (a routine in the boot code uses A6 loaded with an incorrect library base,...
24
votes
1answer
5k 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,...
34
votes
3answers
10k views

What modification is required from a PC floppy for use in Amiga?

Around the end of the time of Amiga popularity, obtaining a replacement Amiga floppy drive was a nuisance, while PC drives were ubiquitous and cheap. One could install a PC drive in Amiga after ...