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7
votes
0answers
86 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.
37
votes
3answers
4k views

What happened to the SEV instruction on the 6502?

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 ...
1
vote
0answers
189 views

Old Computer Game about a robot and questions

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 ...
0
votes
2answers
224 views

VGA controller for my W65C02 computer

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 ...
-1
votes
0answers
137 views

Nintendo NES + modern TV [on hold]

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?
9
votes
1answer
221 views

Why is the Interrupt Enable Hardware Register in the HRAM area on the Gameboy?

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 $...
0
votes
1answer
340 views

How good a Cray could be as a video game console? [on hold]

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 ...
13
votes
2answers
3k views

Could you use uppercase or special characters in a password in early Unix?

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 (...
53
votes
1answer
9k views

When was the famous “sudo warning” introduced? Under what background? By whom?

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, ...
7
votes
1answer
384 views

Can I use the DEC VT220 composite output to connect it to a TV?

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 ...
6
votes
1answer
234 views

What Apple System Monitor/Integer BASIC ROM features were removed in the Applesoft II/Autostart ROM?

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 ...
10
votes
1answer
694 views

On what Apple II and II+ keyboards can the ']' character be generated?

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 ...
4
votes
2answers
262 views

How well can a NEO GEO theoretically run Sega´s Super Scallers Games?

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. ...
9
votes
1answer
382 views

Any Issues with running Workbench 1.3 on a Kickstart 1.2 Amiga 500?

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? ...
2
votes
1answer
148 views

Mac SE tube won't come on?

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
8
votes
0answers
343 views

Can anyone identify this Parallel to Serial Interface Board?

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 ...
2
votes
1answer
195 views

Power switch color on IBM PS/2 red vs white?

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 ...
6
votes
1answer
534 views

What computer has the longest uptime? [closed]

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 ...
11
votes
0answers
258 views

Oxford C compiler for Commodore 64

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 ...
10
votes
1answer
562 views

cprintf printing invisible characters in C program on VIC 20

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 ...
4
votes
1answer
168 views

Exact tape recording format for SVI-318/328 computers

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 ...
4
votes
1answer
351 views

Why is ZX80 much faster than Spectrum on Rugg/Feldman benchmarks?

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 ...
7
votes
1answer
248 views

Any historical references to links between JOSS and BASIC?

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 ...
6
votes
2answers
316 views

Looking for a 90's shooter-platformer game

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 ...
4
votes
2answers
245 views

Does anyone remember an early 90s side-scroller with a player-controlled ED-209-like robot?

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 ...
4
votes
1answer
289 views

Why not build an “approximate” Analytical Engine before the complete one?

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 ...
10
votes
4answers
3k views

Is there any way today to recover/dump 2M disks?

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 ...
5
votes
1answer
250 views

How can I change the MSX function keys using ASM?

How can I change the texts assigned to MSX function keys using Z80 ASM?
2
votes
1answer
128 views

What were Commodore's keyboard layouts before the VIC-20?

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. ...
1
vote
3answers
196 views

Was 1.10 a valid line number in FOCAL?

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?
27
votes
2answers
10k views

Looking for PC graphics demo software from the early 90s called “Unreal”

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 ...
5
votes
3answers
391 views

Which cartridges were typically used together on Commodore 64 systems?

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 ...
14
votes
6answers
5k views

How slow was the 6502 BASIC compared to Assembly

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, ...
20
votes
3answers
2k views

What does it take to recreate microchips like 68000 and 6502 in their original process nodes nowadays?

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 ...
1
vote
3answers
347 views

What was the distinctive rapid clicking sound in late 1990s desktops?

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 ...
4
votes
1answer
115 views

Looking for an IBM multimedia demo from the 80s about “Ulysses”

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 ...
5
votes
0answers
79 views

IBM terminal schematics

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 ...
3
votes
2answers
335 views

How did computers generate 'noise' sound files?

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 ...
11
votes
3answers
2k views

Was there an autocomplete utility in MS-DOS?

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, ...
1
vote
1answer
132 views

What's up with the ASxxx and the “CoCo Disk BASIC binary format”?

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 ...
2
votes
1answer
330 views

How did “RAM” cartridges for the C64 work?

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 ...
7
votes
1answer
192 views

Reading old QIC-80 tape using Linux with ftape

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 ...
3
votes
2answers
307 views

Replacing cord for IBM model M keyboard

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 ...
6
votes
0answers
101 views

Restoring a self-inking printer cartridge

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, ...
3
votes
1answer
245 views

Was UCLA's 1948 Mechanical Computer programmable, or merely a calculator?

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. ...
2
votes
1answer
190 views

Case question for Amiga 3000T

Is the 3000T's case made by Commodore, or was it stock from elsewhere? I need a side panel for one.
2
votes
0answers
107 views

Zip question for Amiga 3000T

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 ...
3
votes
0answers
195 views

What was this music program I played with around the late 90s?

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 ...
3
votes
0answers
95 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 ...
5
votes
2answers
386 views

How do I adjust the OS print output to different screen dimensions on VIC-20?

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 ...

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