Questions tagged [amiga-1200]

For questions regarding the Commodore Amiga 1200 microcomputer.

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4 votes
2 answers
2k views

AmigaOS 3.9 - where can I buy it?

I've been looking all over for a source to buy AmigaOS 3.9. My A1200 has Workbench 3.2.2 and it would be nice to get OS 3.9 since I'm also adding an 68060 card and lots of RAM. Where might I find OS 3....
8 votes
1 answer
855 views

Where can I find a schematic for the Amiga 1200 PSU?

I have tried searching for "amiga 1200 psu schematic" and many variations, but haven't been able to find an A1200 power supply schematic. I was able to find an A500 PSU KiCAD schematic and ...
12 votes
3 answers
860 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 ...
2 votes
1 answer
365 views

A1200 Amitek Hawk, Guru Meditation 8000 000B when loading games from Gotek

Hardware: A1200 CF 4GB (sys part 800MB) KS 3.1 40.68 ClassicWB Amitek Hawk 4MB, FPU 68882, oscillator 28MHz Gotek, Flash Floppy 2.1.4 When Amitek is used the machine boots from Gotek USB adf file ...
29 votes
3 answers
4k views

How can I recover the contents from an Amiga HDD using modern Linux?

I have two Amiga 1200's in pieces. One of them has a 52mb HDD in it and on it is my dissertation from 1995 and all my essays. I want to retrieve the dissertation because it's the only surviving copy. ...
9 votes
1 answer
314 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 ...
8 votes
1 answer
1k 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 ...
5 votes
0 answers
160 views

CF with Workbench not loading in WinUAE but works on real A1200

I have a CF HDD with installed WB3.1, which works as expected on real A1200. Yesterday I wanted to copy over the latest ACA1221 soft, took the CF out, connected to PC just as normal. The WinUAE is set ...
4 votes
1 answer
175 views

ACA1221 cooling

I have an ACA1221 accelerator (not EC). The card is clocked at 28MHz and get's VERY hot. Even when running on default 17MHz the temperature can go as high as 65'C. Is there any way to use any of the ...
2 votes
1 answer
275 views

Software Failure after RAM upgrade Amitek Hawk

I have Amitek Hawk for my A1200, the board came with wrong RAM and apps were crashing with 8003 Guru error. After contacting the seller I was told by mistake wrong SIMM was shipped and I received a ...
12 votes
1 answer
965 views

What is this Amiga 1200 mod?

I got an Amiga 1200 off ebay and it works great, board looks perfect, no leakage, no bad traces, nothing, and yet I have this mysterious mod I've never seen before. Does anyone know what it is?
8 votes
1 answer
440 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 ...
31 votes
1 answer
7k 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
1 answer
917 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, ...
13 votes
2 answers
2k 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 ...