All Questions

Filter by
Sorted by
Tagged with
-1
votes
2answers
70 views

What is this port?

So, first off, to begin with this isn't "exactly" retrocomputing; the technology in question is about 5-10 years old. That being said, I couldn't find answers anywhere else, so my best bet ...
3
votes
2answers
238 views

Trying to recall an OS I worked on that was called CPM but was not DR's CP/M

I'm trying to trace a type of system I did a little work on in my first job, which was for a company which no longer exists and I am not in regular touch with most of my former colleagues. It was a ...
2
votes
0answers
20 views

Who did what exactly for the original Shadowgate (1987) Macintosh video game?

I primarily know Shadowgate from the wonderful NES port, which was ported by some Japanese company and whose Japanese musician composed the beautiful, iconic music which I frankly thought was there ...
5
votes
3answers
415 views

How was dataflow analysis performed before SSA?

If we look at something like LLVM or the GNU Compiler Collection, Dalvik and many others, their intermediate representation (IR) uses SSA (Static Single Assignment form), as part of their Data-Flow ...
0
votes
0answers
11 views

How to burn CDTV extended ROM image to eeproms

I have a patched version of CDTV extended rom, which I need to burn to 2 chips. I have 2 ST M27C1000 with pin swap adapter (pins 2 & 24 - M27C1001), TL866 mini pro programmer, hex editor and I was ...
3
votes
1answer
91 views

From what errors could Commodore's tape loader recover

The Commodore PET/VIC-20/C64 tape routines write out the leader for each file twice, and then write the data twice. While it would seem that this should allow data to be loaded more reliably, ...
26
votes
5answers
7k views

How did games like Doom offer free trials? What was packaged in their free trial software packages?

I remember that Doom had a free trial version where you can play the first episode but the other two you have to buy. There are other games that did that as well. If I understand it, in order to do ...
3
votes
2answers
2k views

When and why did tape recorders acquire a “remote” input?

This entirely-typical-of-the-era (other than mysteriously missing its EAR socket) tape recorder from 1984 was the "standard" type of tape deck for home computer data storage in the UK. They could be ...
9
votes
2answers
246 views

What cables do I need to connect an Atari 130XE to a monitor and a television set?

I found my old atari 130XE, full of dust. I have the power supply but I don't have connection cables and controls. I've searched in eBay, Amazon and such for controls and there are plenty of them. My ...
24
votes
8answers
8k views

Did computer games for Commodore 64 really take “25 minutes” to load “if everything went alright”?

In the Swedish-language song "Nostalgi" by Markoolio from 2003, some of the lyrics go: My first computer had 64 kB you surfed on the water, and that's that The computer games were loaded ...
1
vote
1answer
87 views

Z80: Interrupt (IM2) daisy chain for “foreign” peripherals

I'm looking for a way (apart from manually wiring up Fig.15 of The Z80 Family Program Interrupt Structure) to daisy chain "non-Z80-family" devices in an IM2 Z80 system i'm designing. So far ...
2
votes
1answer
188 views

How did the NSA use vector supercomputers?

In the 80s, the NSA was a major customer of supercomputers. https://www.nsa.gov/Portals/70/documents/news-features/declassified-documents/cryptologic-quarterly/NSA_and_the_Supercomputer.pdf discusses ...
11
votes
3answers
801 views

Where was this Grace Hopper/Univac photo taken?

Here is a photo of a Univac I with four individuals. According to Artifact Details at the Computer History Museum's web page with an extremely similar photo (perhaps a shot a few moments earlier/later)...
3
votes
0answers
68 views

MIPS Encoding of blez/bgtz vs bltz/bgez

In the MIPS architecture, blez/bgtz and bltz/bgez are encoded differently: blez/bgtz are encoded as: [BLEZ/BGTZ: 6 bits] [RS: 5 bits] [0: 5 bits] [OFFSET: 16 bits] bltz/bgez are encoded as: [REGIMM: 6 ...
4
votes
2answers
225 views

What 20th-century computers besides KDF9 replicated hardware for each concurrently-running program?

The KDF9 (English Electric, 1963) had a hardware option for timesharing. This provided four instances of most per-program context: the nest (16-deep expression evaluation stack), the subroutine jump ...
32
votes
12answers
7k views

What “unusual” syntax assembly languages are/were there?

This question may have the apparent form of a question soliciting a "list" answer, but I'm expecting the list to be very short, so please bear with me. What "unusual" syntax assembly languages are/...
1
vote
2answers
360 views

In Donkey Kong (arcade), is there some way to skip the annoying intro sequence?

I find myself dying constantly in Donkey Kong. Although I don't have to pay money each time, it's still annoying to keep having to watch the intro each time. I've tried pressing all buttons I could ...
5
votes
1answer
217 views

VAX 11/780 16MB memory board - what was the physical size?

I'm trying to get a feel for what it looked like when you designed a computer to have a lot of memory chips stuffed into it. To that end, I found this: https://commons.wikimedia.org/wiki/File:...
5
votes
1answer
285 views

How much did the RM 380Z weigh?

The Research Machines 380Z was an early British microcomputer, released in 1977. Unlike many other early microcomputers, the design was industrial style, a hefty metal box, sometimes described as '...
3
votes
0answers
110 views

What was the specific function of the relay which captured Grace Hopper's famous “bug”?

Computer pioneer Grace Hopper often recounted the story of her team finding the first physical computer bug: While she was working on a Mark II Computer at Harvard University in 1947, her associates ...
3
votes
1answer
155 views

Whatever happened to the Refal language?

Refal is a language from the 1960s that is based on the concept of pattern-matching with many features that could be considered advanced even today- it is functional, garbage collected, and supported ...
8
votes
5answers
2k views

Why was there no 32bit or 64bit versions of M68000 & 65xx line of CPUs?

I don't understand why western design centre made the 65816 a 16bit upgrade to the 6502 but commodore semiconductor group/MOS technology didn't make their own variant & why neither company made ...
13
votes
5answers
374 views

Preventing socketed chip corrosion?

I spent a couple hours repairing an Amiga A3000 that wouldn't boot yesterday. The fix was to remove Kickstart ROMs, clean the DIP leads and sockets with contact cleaner, and re-insert. Apparently a ...
7
votes
2answers
311 views

How can I boot or extract files from an IBM PS/1 with a DoubleSpace-compressed hard drive?

I’m trying to boot an old IBM PS/1, mostly with the intention to read out its hard disk. I realized quickly that the original floppy disk drive was broken, so I replaced it with a Gotek floppy ...
1
vote
2answers
129 views

How plausible is this data corruption on an IBM 9-track tape?

Preamble For a while, I had a copy of a BESM-6 Pascal compiler which worked only on very simple programs, like "Hello, world", and would throw a division by 0 exception on anything more ...
0
votes
1answer
199 views

Flag “hidden” on partitions and Microsoft

In this website (and in others, of course) you could be informed that there is a special form of partition flag ("hidden") to avoid detection by Microsoft operational systems. First: Is ...
23
votes
6answers
6k views

Why are old CPUs like MOS Technology 6502 and Motorola 68000 considered better for real time systems applications than modern x86 based CPUs?

Reading the Wikipedia article about real-time computing, I found written that: Once when the MOS Technology 6502 (used in the Commodore 64 and Apple II), and later when the Motorola 68000 (used in ...
6
votes
2answers
1k views

What specific factor(s) made Thomas Watson, Jr. (of IBM) so enthusiastic about early electronics?

One of my favourite computer history books is Stan Augarten's "Bit by Bit", which has an author-approved scanned copy at http://ds-wordpress.haverford.edu/bitbybit/ In it, the author makes ...
0
votes
1answer
49 views

How to flash CDTV extended ROM using development board

I have a CDTV ROM development board, and I know it is possible to flash it using floppies. How to make such floppy with a custom rom?
11
votes
1answer
344 views

Why did IBM develop 5250 block mode terminals when 3270 already existed?

IBM introduced the 3270 family of block mode terminals in 1971, for use with IBM mainframes (System/370 and successors). Then, in 1977, IBM introduced the 5250 family of block mode terminals for use ...
7
votes
4answers
440 views

What's the pitfalls when trying to connect a new SCSI hard drive to an old SCSI bus?

Problem I have a couple of old computers. Some of them have a SCSI-1 or SCSI-2 interface over an internal 50 pin IDC connector or an external DB25. Now I want to connect something to them, in ...
6
votes
1answer
400 views

Putting code into two different memory areas with cc65/ca65

According to cc65 / ca65 documentation, the .org directive does not affect the placement of the code unlike with other 6502 assemblers. The docs suggest defining a memory segment with the intended ...
3
votes
1answer
148 views

Commodore 64 CC65 - I need help with config set up for using a data segment in Bank 3

I'm developing a game for C64 using CC65 to compile my C code to ASM. To get started quickly, I have been defining the data for my sprites in C arrays and then copying the data in those arrays to the ...
3
votes
1answer
195 views

What old version of Windows provides out-of-the-box DVD movie playback?

I bought a Playstation 2 in 2000, which famously included a DVD drive capable of playing DVD movies. I wanted the same movie playback capability on my Windows 98 PC. As I recall, I mistakenly thought ...
4
votes
4answers
398 views

IBM Mainframe APL internals?

The APL language used a unique set of characters, and additionally allowed overstriking of some characters on the terminal to form characters that were used in the language. When an APL workspace was ...
9
votes
2answers
848 views

Looking for a specific BASIC music program from the 80s

When I was a kid, we had a PC-XT with a lot of GW-Basic programs on it. I am trying to track down one in particular -- it was a music player of sorts. A menu (all monochrome text as I recall) and you ...
2
votes
0answers
75 views

advice for retrieving functions and tables from intel 8061/8065 bin file (reverse engineering) from Ford EECV ECU

I have under my disposal some Ford EECV bin files and my goal for the next few weeks is to retrieve the functions and tables and plot them out before going onto DIY hardware . . Does anyone know which ...
44
votes
3answers
6k views

How did C64 games handle music during gameplay?

On the C64 there was no threading, so how did games handle treating at the same time music and game code? Music requires exact timings, and the SID had to be instructed to change the note at the right ...
-5
votes
1answer
179 views

Why do old, network-connected consumer computers from 1980-1999 scare me? [closed]

For this question to be answered correctly, it's necessary for me to establish some context. I was born 1985. I'm neither a very young person who grew up with "smartphones", nor so old that ...
4
votes
2answers
306 views

CPC BASIC “CALL” command

Recently I've been playing around with an Amstrad CPC emulator. I haven't written BASIC code for years, but back in the day I did actually use a CPC for real. Anyway, looking at documentation online, ...
19
votes
3answers
2k views

Could a single NES ROM cartridge run on both PAL and NTSC systems?

Most ROMs are labeled with "(Europe)" or "(USA)", meaning PAL or NTSC. However, some are labeled "(World)". At first, I didn't think twice about this, just assuming that ...
7
votes
4answers
2k 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 ...
8
votes
1answer
1k views

Is the NeoGeo capable of raster effects?

The Neo Geo has incredibly powerful sprite based hardware, but can it do raster effects? Raster effects are where changes to the graphics hardware registers are made mid frame, usually timed to be in ...
5
votes
3answers
1k views

1980's commodore 64 game about flying toward tower

Wondering if anyone can help me shed some light on this vague memory I have as a kid. My older brother had a friend who got us tons of pirated games for our commodore 64/128. I'm trying to recall one ...
15
votes
1answer
424 views

Where and when did the “.s” suffix for assembly-language source files originate?

The closest I was able to find on StackOverflow is What are .S files?, in which no answerer addresses why we use .s for assembly. (And .S for preprocessor/macro assembly; and gcc -S to produce ...
8
votes
1answer
5k views

Symbian emulator to run Ngage games

I don't really know if this is the correct place to ask this, if not let me know where I should. I would like to know if it would be possible to run Ngage games on an existing Symbian emulator. There ...
2
votes
1answer
171 views

How to get started with writing drivers for amiga OS

I would like to learn how to write drivers for Amiga OS. Seems like a daunting task, but I have spare time and I find great value for amiga (CDTV) community in particular. Currently if a CD ROM breaks ...
20
votes
5answers
5k views

When IPv6 was designed were there any specific considerations for other planets?

Seeing Moon base internet functionality in Worldbuilding reminded me of how I began an old Space SE question Are there discussions or plans for extending the internet into space beyond Earth? Many ...
6
votes
2answers
184 views

Are there any known 8086 systems that would dynamically switch between XTAL and EFI clocks on 8284 clock generator?

In an typical 1980s 8086 system the 8284 clock chip is typically used to generate the clock for the CPU. The 8284 has two clock sources XTAL and EFI. XTAL provides a steady clock source from a ...
4
votes
3answers
413 views

Bad floppy drive in T1910CS 486 laptop

I've recently picked up a Toshiba T1910CS 486 laptop. It's in OK shape, with a 500MB hard drive and DOS installed. I also ordered a USB floppy disk drive and some floppy disks so that I could install ...

15 30 50 per page
1
2 3 4 5
73