All Questions

290 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
19 votes
0 answers
465 views

Is an X Window System older than release 10 available online?

I'm looking for any copy of the X Window System older than release 10. The oldest on x.org is X10R3. Bob Scheifler doesn't have anything. Jim Gettys may have something, but has yet to retrieve it ...
Lars Brinkhoff's user avatar
19 votes
0 answers
1k views

Oxford C compiler for Commodore 64

I kept one floppy from my Commodore 128 (which I used mostly in C64 mode), labelled ‘Oxford C compiler’. It is a 5.25″ floppy. Don't ask me why I kept just this one; probably because I thought I ...
Michel Keijzers's user avatar
17 votes
1 answer
586 views

When was an image of an apple first used to promote the APL language

The APL community is contemplating the adoption of a common logo but some are worried about trouble from Apple lawyers. Now, IBM and others have been using apple motifs in promoting APL for a long ...
Adám's user avatar
  • 668
16 votes
0 answers
835 views

Was there a cartoon series in the UK computer press called "Computability Brown"?

My dad was a computing professional in Scotland in the 1970s. He received a couple of industry trade magazines every week, such as Computer Weekly and Computing. In one of them, I remember there being ...
scruss's user avatar
  • 21.7k
14 votes
0 answers
476 views

Is it possible to trap 387 FPU opcodes on a 287 connected to a 386?

The 8087 and 287 FPUs were designed before the IEEE 754 standard was released. Because of this, they contain some instructions which are not compliant with it. When the 387 was released in 1987, it ...
DarkAtom's user avatar
  • 2,337
14 votes
0 answers
239 views

68060 CLKEN and CLK pins

Using an 68060 to 68040 Amiga adapter on another brand. The adapter ties the 68040 BCLK to the 68060 CLKEN. The CLK pin on the adapter is left floating. To run the CPU with 1/2 bus will I need to ...
M Grove's user avatar
  • 141
14 votes
0 answers
490 views

Is there a simple BASIC program that demonstrates SID6581 distortion?

Many songs use a SID6581 design "flaw", distortion, as an effect. I tried experimenting with the filter and resonance registers, but was unable to reproduce the sound. What conditions are necessary ...
rcntxtlztn's user avatar
  • 2,217
13 votes
0 answers
624 views

Original instruction set for the first ARM processor

I'm studying ISAs and would really like to see the very first ISA that Sophie Wilson chose/put together when designing the very first ARM CPU while at Acorn Computers around 1983 or so. From what I ...
dvanaria's user avatar
  • 341
13 votes
0 answers
433 views

Unix on the H11?

I'm curious if anyone is aware of actual uses of Unix on the Heathkit H11? I don't see any technical reason a memory-expanded H11 couldn't run Unix, but can't find any examples of it doing so.
Maury Markowitz's user avatar
13 votes
0 answers
574 views

Who owns the intellectual property of Thinking Machines today?

Who owns the intellectual property regarding the Connection Machine and other products from Thinking Machines? I believe the remnants were bought by Sun, so possibly Oracle, but does anyone know?
Jan Mattsson's user avatar
13 votes
0 answers
903 views

In search of.... SeaWar -- NOT Battleship!

Hopefully, sufficient background Many years ago (40-45), I used to play "Sea War" on a good sized time-share system. It was a text/adventure war game between a couple remote players, played over a ...
user2338816's user avatar
12 votes
1 answer
1k views

1990s BBS game featuring mining elements from a planet

Sometime in the 90s (sorry, can't be more specific) I used to dial in to a BBS and play a multi-player game that involved manually mining elements from a planet. It was very detailed, you got employed ...
timbitsaregood's user avatar
11 votes
0 answers
381 views

When was the asterisk first used for "unsaved changes" and why?

The asterisk itself has been around as a symbol since literally (pun intended) before the earliest writing systems. Among its many uses, in some user interfaces it denotes unsaved changes to a file or ...
TypeIA's user avatar
  • 211
11 votes
0 answers
235 views

Anyone know of older mentions of the word "trap" for software interrupts than the IBM 704 manual from 1955?

I've dug into the origin of the word "trap" in computer engineering. The older documented mentions of the term I can find, is the "trapping mode" in the IBM 704, specifically in ...
BipedalJoe's user avatar
10 votes
0 answers
268 views

How was BOS on the Apple III different from SOS?

The original operating system for the Apple III was SOS, a.k.a. "Sophisticated Operating System". Though the Apple III and SOS didn't last very long as the platform was considered a failure, ...
bjb's user avatar
  • 16.4k
10 votes
0 answers
294 views

What used EBCDIC code pages 1 thru 5?

For US English, the most commonly used EBCDIC code page is 37, which is one of the CECP code pages (Country Extended Code Page). The old IBM globalisation database has a 1986 copyright date for code ...
Simon Kissane's user avatar
10 votes
0 answers
224 views

What was IBM's internal Specification Language of the 1980s?

Within IBM's internal Development community, there was a move in the 1980s to bring our skills up to date. As part of this, we were introduced to a specification language, independent of the ...
iainH's user avatar
  • 201
10 votes
0 answers
393 views

What's so different about Super Mario Brothers World T-1 that it doesn't look like level data at all?

Youtube video here: https://youtu.be/E6qRbk5Cscw?t=1127 Most of the glitched worlds are clearly ROM fragments of world data being loaded, most of them out-of-alignment and being rather messed-up. This ...
Joshua's user avatar
  • 1,839
10 votes
0 answers
373 views

Everex Systems EV1250: Perhaps a 286 accelerator? I need its manual

Recently I got an unknown card named EV1250 that I couldn't find any information on what it was. I assume it's probably a 286 accelerator. There are some memory chips on the left side of the card and ...
Sung's user avatar
  • 509
10 votes
0 answers
395 views

Was the RPL language for the Commodore PET ever used other than by its author?

Note that this question is about the programming language RPL for the Commodore PET, not the HP language with the same name. RPL was developed by Tim Stryker and sold through his company Samurai ...
WimC's user avatar
  • 1,076
10 votes
0 answers
234 views

Which versions of StuffIt introduced backwards-incompatible changes to the file format?

In order to help people who want to integration-test tools which shell out to The Unarchiver's lsar and unar utilities, I'm trying to build a legally clean repository of test archives in StuffIt SIT ...
ssokolow's user avatar
  • 7,095
10 votes
0 answers
288 views

What happened to the Speakeasy computational environment?

After reading his interview with the Computer History Museum , Cleve Moler (creator of MATLAB), mentioned that the Speakeasy Computational Environment was a precursor to MATLAB, and served as some ...
user avatar
10 votes
0 answers
498 views

How would toggling a bit in the POWCNT1 register cause hardware damage on the Nintendo DS?

From GBATEK, writes to a certain I/O port for power management may damage hardware: 4000304h - NDS9 - POWCNT1 - Graphics Power Control Register (R/W) 0 Enable Flag for both LCDs (0=Disable) (...
forest's user avatar
  • 2,029
10 votes
0 answers
355 views

How much did Atari pay for GEM?

Atari licensed Digital Research's GEM graphic user interface for the ST. As https://www.filfre.net/2015/04/the-68000-wars-part-2-jack-is-back/ puts it: And of course in the wake of the Macintosh the ...
rwallace's user avatar
  • 62.4k
10 votes
0 answers
426 views

What is the timeline of NASA ground control computers?

In the movie "Hidden Figures", NASA receives an IBM 7090 in 1961. What is the subsequent timeline of the primary computing means for flight planning and orbit calculation? Specifically, what was the ...
Leo B.'s user avatar
  • 19.4k
9 votes
0 answers
275 views

Why must the Amiga 1020 disk drive be powered-on before and powered-off after the Amiga computer?

The Amiga 1020 was a 5.25" disk drive for use with the Amiga computer. Anecdotally, I suspect they are somewhat rarer these days because they were a less popular choice for a second drive back in ...
Geo...'s user avatar
  • 10.2k
9 votes
0 answers
560 views

When did Kay Nishi offer a million dollars for a competing DOS?

The development of Digital Research's fully-compatible MS-DOS competitor, DR DOS, was encouraged when, according to https://retrotechnology.com/dri/dri_wein.html After DOS Plus for Philips we did a ...
rwallace's user avatar
  • 62.4k
9 votes
0 answers
189 views

What should be put to the first 128 bytes of the code segment in Xenix 86?

I'm writing a hello-world program for Xenix 86 in NASM. See the full source code. If I only put this to the code segment, then it fails with segfault (Memory fault) on Xenix 286: mov ax, 4 ; ...
pts's user avatar
  • 2,013
9 votes
0 answers
219 views

Plessey computer at Stanford?

While updating the wiki article on the 4004, I came across an interesting claim by Ted Hoff, who stated the idea of using a general-purpose CPU in a calculator came to him due to a minicomputer that ...
Maury Markowitz's user avatar
9 votes
0 answers
244 views

Systems that used the Rockwell R65C00/21 or R65C29

The Rockwell R65C00/21 and R65C29 are described in an October 1984 datasheet ("R65C00/21 dual CMOS microcomputer and R65C29 dual CMOS microprocessor," Document no. 29651N64, rev. 2) which is ...
JRN's user avatar
  • 1,265
9 votes
0 answers
315 views

Looking for late 90s shareware open world racing game

I'm trying to track down a shareware racing game released somewhere between 1999 and 2004 - or at least, my parents found it bundled in a computer magazine during that time. Here's what I remember ...
memory noise's user avatar
9 votes
0 answers
702 views

Behavior of lesser known illegal M6800 opcodes

The M6800 had a few illegal opcodes, including the (in)famous HCF (Halt and Catch Fire). The following illegal opcodes were revealed in BYTE Magazine, December 1977: $14: NBA $87: STAA immediate $C7: ...
tobiasvl's user avatar
  • 1,539
9 votes
0 answers
932 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 ...
user180940's user avatar
  • 3,726
9 votes
0 answers
755 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 ...
Geo...'s user avatar
  • 10.2k
8 votes
0 answers
502 views

How was the Amiga console supposed to work with only 32KB of RAM?

During the development of the Amiga, one of the targets was a game console with 32KB of RAM. How was it supposed to work? by blitting ahead of the beam with the Copper to avoid double buffering? was ...
Valentino Miazzo's user avatar
8 votes
0 answers
437 views

What is the origin of executable compression?

According to the wikipedia article on the topic, the earliest executable compressor listed is Realia Spacemaker for IBM PC (since 1982, written by Robert B. K. Dewar, SM.COM, signature "MEMORY$&...
Leo B.'s user avatar
  • 19.4k
8 votes
0 answers
312 views

Undefined opcodes for the Intel 8008 CPU

What happens when I8008 CPU reads the "undefined" opcode (22h, 2Ah, 32h, 38h, 39h, 3Ah; or in octal 042, 052, 062, 070, 071, and 072)? Are these opcodes evaluated as a NOP instruction, or ...
Martin Maly's user avatar
  • 5,575
8 votes
0 answers
147 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 interprets it as a NOP ...
hippietrail's user avatar
  • 6,654
8 votes
0 answers
262 views

A learning gomoku in Lisp

Years ago I played a version of gomoku that was written in Lisp that learned as you played. After a few rounds, it became nearly unbeatable. This was on Unix System III on a small PDP-11. I have ...
Dennis Williamson's user avatar
8 votes
1 answer
530 views

Why was the Altair numbered "8800" even though the processor was an 8080?

The Altair 8800 was a computer using the Intel 8080 processor. Why the difference in numbers?
DrSheldon's user avatar
  • 16.3k
7 votes
0 answers
217 views

What was the title of this IBM PC software compendium book circa mid 80s?

Sometime in the mid 90s I stopped by a library that used to sell off their old stock and bought a copy of an IBM PC software compendium that I am now struggling to remember the name of or find ...
Noel Whitemore's user avatar
7 votes
0 answers
520 views

Looking for the name of a natural language Fortran compiler

Back in the 80s I ran across a book at a garage sale titled something like "Programming Fortran In English" or "Programming Fortran In Natural Language" that described a compiler ...
JockM's user avatar
  • 71
7 votes
0 answers
318 views

Were there ever any commercial products produced for the BeBox GeekPort?

I know that the BeBox was a short lived product, but whenever someone mentions it they never fail to also point out the "GeekPort". While the possibilities of the GeekPort were tremendous, I'...
bjb's user avatar
  • 16.4k
7 votes
0 answers
339 views

Origin of Cisco-like CLI?

Loads and wagons of networking devices all over the world use the same manner for commandline interface (CLI). First I met it in 1990s at Cisco devices (switches, routers...) which used Cisco IOS. It ...
Netch's user avatar
  • 530
7 votes
0 answers
497 views

Bloodsport: Which version of Karate Champ is it?

In the movie "Bloodsport", there's a sequence which is famous among video game players, where Frank Dux and Jackson "fight" through a Karate Champ arcade game machine. Now I'm ...
Jean-François Fabre's user avatar
7 votes
0 answers
205 views

What did CPU time and disk space cost at a CDC 6600 Data Center?

In the mid-1970s,there was a big time sharing CDC service center in Waltham, MA. I'm curious what it cost to run computer jobs there. (My long winded story follows) In 1976, I had a summer job of &...
user1683793's user avatar
7 votes
0 answers
88 views

iRMX bootsector on a iRMX partition how to clone?

I have an old year 2000 instrument which has a 340MB hard drive. I am trying to clone the hard drive but I am having major issues. First the instrument uses iRMX and MSDOS the bios is using the CHS ...
mpcengineer's user avatar
7 votes
0 answers
175 views

Who designed and manufactured the SA1 (RF5A123)?

The SA1 (also labelled RF5A123) is an enhancement chip for the Super Famicom/Super Nintendo. It is based on the 65C816, which the Super Famicom's main CPU (the Ricoh 5A22) is also based on. It seems ...
user's user avatar
  • 15.3k
7 votes
0 answers
315 views

Was the Zilog Z8070 ever mass produced?

I only recently came across a mention of the Z8070 FPU for the Z8000 family. According to some benches, it was very fast given its HMOS implementation and clock. Of the very little information I can ...
Maury Markowitz's user avatar
7 votes
0 answers
136 views

Apple II floppy drive, pressure pad cleaning or replacement?

This is related to the following question: Cleaning 5¼" floppy drives Is there a proper way to clean the pressure pad that simply presses against the back side of a single-sided 5.25-inch ...
Dale Mahalko's user avatar
  • 3,639

15 30 50 per page
1
2 3 4 5 6