All Questions

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.

The 6502 has a group of opcodes which copy bit 5 from the opcode into one of the status flags. (I know it's not implemented this way, but it looks as though the bit fields are: 2 bits to select the ...

I'm trying to remember an old game I used to play as a kid. It may have been a commodore 64 game, not sure. All I remember was you answered questions like for math or something like that and as you ...

I´m planning to build a small computer system, based on the W65C02 from Western Design Center. This computer system should also have a VGA interface with a graphic and a text mode, defined with the ...

I have a very old Nintendo NES. It was working perfectly with my old TV. Today a wanted to play in a new Philips TV, but it doesn't recognize my consol. Is it possible somehow to play in new TV?

It's something I've always been wondering: Almost all of the hardware registers on the Gameboy are placed between $ff00 and $ff7f (with plenty of gaps and empty space), the HRAM is located between $...

The stats are: https://en.wikipedia.org/wiki/Cray-1 Memory‎: ‎8.39 Megabytes (up to 1 048 576 words) CPU‎: ‎64-bit processor @ 80 MHz The 24-bit address arithmetic was performed in an add unit and a ...

This article is about Ken Thompson's old Unix password hash being cracked. One line in the article intrigues: "Even an exhaustive search over all lower-case letters and digits took several days (...

On all Unix-like operating systems, sudo is often provided as the standard package for executing commands as superuser (or an alternative user). When sudo is invoked by the user for the first time, ...

I have a DEC VT220 from 1986, it has a composite output. Works great in all its max-19200Kbps monochrome glory. The composite output plug is a BNC, and it looks like BNC-to-RCA composite jack ...

In spring of 1978, Apple took the updated 6502 BASIC from Microsoft, fixed some bugs and added some new commands, and released it as Applesoft II. This was soon released as a ROM set (shipped standard ...

It had long been my impression that while brackets [ and ] could be displayed by the Apple II, the standard Apple II keyboard was not capable of generating them. Some time ago I noticed that on this ...

The Neo Geo had a remarkable capacity to scale sprites, as we can see in fighting games, but it does not have any racing, flight or any game that simulated a non ray casting pseudo 3D to my knowledge. ...

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? ...

My SE was working fine until I took it apart to clean it, and after reassembly the tube won't turn on, what could cause this? enter link description here

I just spent an enjoyable day at the local ham fest with my father - digging through boxes of other peoples junk. I'm a sucker for weird electronics, especially when it's in the free pile, and so I ...

Why do some IBM PS/2's have a red switch, while others have a white switch? Does the red or white power switch on the power supply signify something about the model number, CPU, or options that the ...

Inspired by a YouTube video I saw recently that claims a very high uptime for the computers on the Voyager probes, I was curious -- what computer currently has the longest continuous runtime? For the ...

I kept one floppy from my Commodore 128 (which I used mostly in C64 mode), which is written Oxford C compiler. It is a 5.25" floppy. Don't ask me why I kept just this one; probably because I thought I ...

I want to compile and run a Hello World program in C with the cc65 compiler for an unexpanded VIC-20 model. For printing I'm using the conio.h function cprintf, since the conio implementation requires ...

I'm looking for the exact tape data format of old SVI-318/328 computers, some kind of whitepapers explaining it. I've obtained several information from a real tape, but I don't known if the infered ...

If you look at the results of the Rugg/Feldman benchmarks, shown in this Wiki entry, you'll see that Sinclair ZX80 is much faster than Sinclair Spectrum on all tests despite the fact that both ...

I only recently learned of the JOSS language, and then only through a roundabout fashion from an interview with David Ahl where he mentions FOCAL. This led me to read the available manuals for all ...

Back in the 90's i remember playing a 2d shooter-platformer game on my family's home computer. I sucked at the game, and as far as i remember i never managed to beat the first level. The details i ...

I remember playing a side-scroller at a Babbage's at the mall (on probably a sweet Compaq; I don't think it was on a C64, an Amiga, an Apple, or anything more exotic), probably around 1993, where the ...

From the website https://plan28.org/ and blog http://blog.plan28.org/, it seems that the original documents are scattered and hard to decipher. It might be that the plans are not even close to be ...

2M disks where formatted using 2MGUI to increase 3"1/2 & 5"1/4 DD/HD/ED disks' capacity. Is there any way today to recover/dump these disks to a file with modern hardware? Specially the 5"1/4 ...

How can I change the texts assigned to MSX function keys using Z80 ASM?

Starting in 1980 the VIC-20 keyboard seems to have become sort of a standard for Commmodore, being re-used on the MAX Machine (in membrane form), C64, C16 and (with additional keys added) the 128. ...

I'm looking over examples of FOCAL code, and I see that group numbers in the examples start with a 0 if need be. That is, it's 01.10, not 1.10. Was a leading zero optional?

Back in the early 90's I remember downloading a graphics demo called, I think, "Unreal". This was on DOS on a standard PC and probably downloaded from a BBS. Identifying information: It ran for ...

It's possible to extend the Commodore 64 expansion port bus with boards like this one: Thus it was physically possible to have more than one cartridge connected at once, though whether these would ...

Imagine a modern computer, where let's say Python is a high level programming language and needs to be interpreted in order to execute a piece of code. You could write some code in C, compile it, ...

I am trying to figure out what type of machines could be used to reconstruct these chips nowadays. It doesn't need to use exactly the same machines used to build them, it's just that the product ...

I am fairly sure that this clicking wasn't just because my computer had issues, although that would be interesting to find out. I distinctly remember that the first computers I owned would make a ...

I am trying to identify / find an online copy of a multimedia technology demonstration video. Timeframe: late 1980s? Source: IBM. Format: VHS. The content of this video was a computer program with a ...

I'm searching for the electronics schematics for IBM terminals 3477 and 3486. I've already googled for it without success. I've to mend this hw and the power side seems ok but doesn't function, so I ...

I figured out how to make square, triangle, and sawtooth waves in pygame. However, I have no clue what kinds of waves I need to make to produce a 'noise' sound effect like you see in older computer ...

MS-DOS (at least 6.22) had optional features such as DOSKEY to remember the command line history, which is now standard on modern command prompts. However, I'm not aware of an autocomplete feature, ...

The ASxxxx assembler system is a multi-platform assembler that supports a lot of different CPUs, including Z80, 6800, 6502, 6809, etc. I'm intending to use it to build software for a variety of ...

Section 7.1.1.2 of the VICE manual mentions that cartridge slot 1 (of the four slots 0, 1, Main and I/O) in the emulator is special in that it's designed to support "mostly RAM-based cartridges" (of ...

I have an old Colorado 250MB tape drive, which connects to the PC's floppy controller, that I'd like to use to read a QIC-80 cartridge. I know that very old versions of the Linux kernel used to have ...

I bought a model m keyboard for use at work. The keyboard functions fine, but the cord is in bad shape. Functionally, the cord does not cause any shorts, but the plastic is very brittle and large ...

I've seen people ask about restoring printer or typewriter ribbons, but my situation's a little different. I have a self-inking ribbon for a DECwriter Correspondent. It's easy to open up the casing, ...

We define programmable machines as those that can do: sequence selection, and iteration ie the Turing Model of Computing. Here we see the UCLA's 1948 Mechanical Computer performing a calculation. ...

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

I am trying to get a 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 the ...

It ran on windows 95 or 98 I believe. It allowed you to make music by placing colored blocks in various rows. I think it was associated with mtv, but I'm not sure (I had never actually heard of MTV at ...

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 ...

The graphics chip of the VIC-20 has a setting for the number of columns and the number of rows to display. So, instead of the default values of 22 columns and 23 rows, for example, it is possible to ...