Questions tagged [operating-system]

For general questions regarding operating systems on retrocomputers.

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2
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0answers
232 views

Ancient browser media photo [closed]

Perhaps 15 years ago, I saw a photo which looked professional showing multiple media types all with labels for either Netscape v4 or the integrated Mozilla suite (which became SeaMonkey). At the very ...
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1answer
230 views

Why does Linux not show you an asterisk when you enter a character for a password? [closed]

I have enjoyed Linux for about two years now, but I laugh at how hard I failed when I first started my Linux journey. I would try and enter a password and then nothing would happen. I first thought ...
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2answers
201 views

AST Laptop With No OS

I work in network design/IT for a church, and a someone came in with a AST Advantage Explorer 486SX/33. It looks like it has no OS. After failing to boot, it requests to go to the BIOS to look for an ...
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1answer
2k views

Processor and operating systems for automatic lifts/elevators

Most automatic elevators have an algorithm that optimises travel between floors and users. Presumably this can be tailored to a particular building. The first elevators were hand-operated purely by ...
2
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2answers
303 views

What tricks or techniques were used to speed up AmigaOS boot

I did an installation of Workbench 3.1 grounds up. The system takes a moment to boot, well over a minute. I've watched a YouTube video where the system booted in seconds. I have another image of ...
3
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2answers
373 views

The “hidden” flag on partitions and Microsoft

On this website (and others, of course) you could be informed that there is a special partition flag (“hidden”) to avoid detection by Microsoft operating systems. First: Is this a convention by/with ...
6
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2answers
295 views

Amiga OS 3.1 vs 3.5 vs 3.9 system difference

I'm trying to find some resources on different versions of Amiga OS (aka Workbench) especially if there were any major changes to the OS architecture, resource use and drivers (with a goal to make ...
9
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2answers
3k views

What was this OS / Application on a 80286?

I was hoping, that someone could help me find the name of the operating system that was originally (I guess) used on the 80286 (the later ones with 12MHz). Before I eventually installed DOS-5.0 and ...
10
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2answers
713 views

Trying to understand some assembly syntax in the Unix v7 write system call

so here is the code: (which comes from here, I've also verified this source is in my unix v7 distribution). For reference, this is running on a PDP-11 simulated with the simh program (so please keep ...
2
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1answer
237 views

How to implement a 'write' function in pdp-11 / MACRO-11 / ODT using simh?

So, I'm working on a project where I'm aiming to get the first winner of the IOCCC (obfuscated c code contest) dissected down to the last detail... The program is mullender.c which you can find by ...
2
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0answers
75 views

What does a “DK” signature at the start of track 0 sector 3 of a Dragon 32/64 floppy disk?

I'm looking at disk image files for the Dragon 32 / Dragon 64 computers. The Dragon computers are very similar to the Tandy TRS-80 Color Computer "CoCo" but are not clones and are not the ...
6
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4answers
735 views

What’s the most advanced os I can run on a non memory management pdp11 (ie 11/20)

Building my own emulator. I only have the basic , no memory management, model going (11/20?). I started with caps11. What’s my best choice for a disk based os. EDIT: and of course if anybody has the ...
3
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0answers
29 views

On the TRS-80 models I and III when is the directory track number written in the third byte of sector zero, and when in the second byte?

Earlier I had found that many but not all TRS-80 Model I and Model III disks begin with the three bytes 00h FEh 11h. This is the beginning of the boot sector where the CPU interpets it as a NOP ...
3
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1answer
108 views

Converting Apple II ProDOS blocks to DOS tracks and sectors

The 8-bit Apple II had two disk operating systems with different disk access semantics. DOS used tracks and sectors. A sector is 256 bytes. ProDOS used blocks. A block is 512 bytes. But mapping ...
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3answers
222 views

What exactly has the windows OS relationship been towards MS server offerings?

This question is related to this one. I always was understanding that windows the OS was a companion app of sort in regards to the server offerings and that, yes you could use it for home use, but it'...
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7answers
10k views

How exactly did Windows become the OS of the home PC?

As far as I understand it, the whole personal computing revolution that Microsoft Windows did was not entirely by its own design. Is it true that the Windows OS at its core was originally designed to ...
38
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6answers
9k views

How should we interpret Dave Cutler's criticism of Unix?

Dave Cutler is well known for his contributions to operating systems, having led the effort on VAX VMS at DEC and Windows NT at Microsoft. According to his Wikipedia page, he is also known for ...
10
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3answers
674 views

What happened to the S1 operating system?

(Computerworld, Vol. 17, No. 41, 1983, p. 49) Additions: Robert Knight, formerly of Princeton's computer laboratories, is [...] the creator of S1, which he had running on an IBM Instruments ...
4
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1answer
106 views

Version list for TOPS-10?

So, does anybody have a list of TOPS-10 versions? I haven't been able to find any information aside from versions 7.03, and 7.04. are these lost to time? To clarify, I'm not asking for the software, ...
4
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7answers
465 views

Static memory partitioning

Does anyone know of any operating system that used static memory partitioning: contiguous physical memory allocation with one process per partition, one partition per process, partitions generated at ...
24
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1answer
6k views

What was the first operating system called DOS?

MS-DOS a.k.a. PC-DOS nee QDOS, was commonly just referred to as DOS. But 'disk operating system' is a very obvious acronym; there must have been previous operating systems so called. What was the ...
14
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12answers
4k views

Late 1970s and 6502 chip facilities for operating systems

I'm quite unfamiliar with how operating systems used to be written but its clear to me that operating systems were clearly written for these systems. I'm particularly interested in how operating ...
7
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1answer
807 views

How to read Microware OS-9 RBF Filesystem under Windows / Linux?

I have a virtual disk image file os9000-xibase.img and Windows can't read it nor mount it. With ImDisk Virtual Disk, I'm able to mount it, but not read it, because it is a Random Block File System ...
32
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6answers
16k views

Why did Windows 95 crash the whole system but newer Windows only crashed programs?

Example situation. You are using a program in Windows 95 and screen goes blue only for you to restart the whole computer You are using a program in Windows 7 and the program stops responding only to ...
14
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2answers
2k views

Why has Novell never written its own boot loader?

I've never used NetWare 5.x 6.x but if I remember correctly versions 3 and 4 required you to boot to DOS partition and then load NetWare server files from it. I could never understand the logic behind ...
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6answers
2k views

Single level file directory

Have there actually been any commercial operating systems with a single-level, limited capacity file directory? I remember vaguely that the early versions of MS-DOS FAT12 may have had a single layer, ...
2
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1answer
201 views

How to load into FAST RAM on Apple IIgs?

The Apple IIgs (last, ROM03 version) came with 128K of standard RAM and 1M of FAST RAM. The distinguishing characteristic of the FAST RAM is that code running from there can run at 2.8 MHz instead of ...
12
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1answer
1k views

Why the DOS extender and DPMI were unavailable to DOS programs on 286 standard mode of Windows 3.0

An old article on Windows 3.0 from PC Magazine (June 11, 1991, page 348) said that: Using standard mode, the Windows DOS extender and DOS Protected Mode Interface (DPMI) are available to Windows ...
8
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0answers
320 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 ...
10
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2answers
531 views

What is the difference between CTSS and ITS?

I learned from the history of Multics that in the early days of computers, Time Sharing System (TSS) was used at MIT, and then Compatible Time Sharing System (CTSS) was developed in 1961, also at MIT. ...
13
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2answers
681 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 ...
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2answers
521 views

Why did Steve Jobs say that Darwin is a kernel? [closed]

In this video, Steve Jobs introduces Mac OS X (in the year 2000), this is a snapshot from the video: He says that Darwin is the kernel for Mac OS X. Now the following is a diagram of the Mac OS X ...
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4answers
514 views

In what way could the Sperry Univac BC-7 computer “speak and understand” English?

Researching for this question I ran across this 1978 advertisement for Sperry: The computer is nicknamed "B.C." and the actor says (in part): What I really like about BC is he speaks and ...
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4answers
545 views

Operating systems which have non-x86 instruction set architecture [closed]

What are the most famous operating systems for non-x86 computers? I mean, most famous OS which have different instruction set architecture. Background (to better understand my task): I ask this ...
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8answers
1k views

Are there any old and nowadays active Operating Systems which has only BASIC Programming Language?

Some old Operating Systems I hear have only BASIC Programming Language. Are there any active and old operating systems which includes only BASIC Programming Language?
4
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1answer
321 views

Operating systems (on support or recent) to install on a i486 processor computer [duplicate]

What operating systems would you recommend for this type of hardware? Though I keep the question text generic because answers can work for many others, but my specific case is a Laptop Siemens ...
32
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2answers
3k views

How many OS/2 viruses were there?

When I was in college, I remember IBM representatives trying to sell OS/2 Warp to students and teachers by saying that there were no (known) viruses for OS/2. (Of course, that didn't stop the makers ...
4
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1answer
320 views

What happened to EYRX?

In 2001, Eyring Corporation released a 32-bit reconfigurable RTOS called EYRX. I remember downloading the documentation and programmer guide from their Web site. Strangely, no traces of that OS can be ...
21
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1answer
2k views

Process model in early UNIX

I heard recently that the process model in very early variants of UNIX was quite a bit different to the fork/exec model used nowadays. How did it differ from the current state?
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1answer
3k views

Emulating IRIX on a modern system [closed]

Has there been any attempt to emulate a system that could run the IRIX operating system?
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2answers
610 views

Starting a multi core CPU as single core [closed]

Is it possible to use a system with a modern, multi-core CPU with older operating systems that only support single core operation? Is this something that needs to be set in the BIOS? Does it depend ...
6
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2answers
914 views

What is the highest version of System 7 that can be run on a Mac SE/30?

My recently restored Mac SE/30 has System 7.0 running on it at present, booting from an original SCSI HDD. I’m missing a few key features, like disk image mounting, which I understand were added in ...
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1answer
2k views

Which operating systems for 80286 computers allowed a process to use more than 128k data?

Out of all the operating systems for the 80286 processor I found, only two make use of the protected mode's ability to load more than one segment for text and one for data. These are MS-DOS (through ...
7
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1answer
2k views

How to install System 7.5.5 on a Macintosh SE/30 using floppies?

I have a Macintosh SE/30 with a formatted Disk. I'd like to install the latest System 7 on it that will run. According to Wikipedia that should be 7.5.5. According to several sources Apple has made it ...
61
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13answers
15k views

Were later MS-DOS versions still implemented in x86 assembly?

Recently, Microsoft published the source code of old MS-DOS versions on GitHub. What is odd in my opinion is the use of x86 assembly language for everything. The assembly language would not be my ...
6
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2answers
432 views

Can anyone help provide more information regarding an operating system called I/OS by Infosoft in the early 1980's?

The title pretty much says it all. I'm looking for information about an operating system called I/OS by a company called Infosoft in the early 1980's. I think it might have been a CP/M variant and ...
49
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10answers
9k views

Why was preemptive multitasking so slow in coming to consumer OS's?

Preemptive (rather than cooperative) multitasking was a highly-touted feature for PC's in 1996, with its inclusion in Windows 95 for the first time. It was also highly-touted for 2001 Macs when ...
19
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1answer
2k views

Where does the hierarchical directory structure originate from?

Windows, Macintosh, Unix/Linux: today, they all support a hierarchical directory structure. The differences are in the details (mount points vs drive letters), but all use a hierarchical directory ...
6
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1answer
516 views

Which DOS for a TRS-80 Model 4P?

Looking at the TRS-80 Disk Software Page, there's a rather extensive selection of DOS options that seem to work with the 4P and also claim high compatibility with the Tandy "TRSDOS" option. ...
23
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2answers
3k views

The origins of fork()

Is fork() older than C? What are its origins? I might think that fork() was created along with C (1970s) but I recently read a reference to a 1963 paper where fork() was mentioned.