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9
votes
3answers
497 views

How can I copy software which is too large for one Atari ST floppy disk?

I have downloaded the STOS game creator from the STOS download page. I'm trying to copy the software from my computer to a floppy disk formatted on an Atari ST, but I get an error message saying the ...
8
votes
2answers
675 views

Cleaning Atari ST mouse and experiences with the USB/PS2 adapter

I am user a Atari ST computer and my original mouse has a very slow movements and little range for each movement, for this reason it is needed to move multiple times the mouse, I have tried to clean ...
9
votes
2answers
765 views

How to fix a TI99/4a membrane keyboard?

I recently purchased a 1982 TI99/4a that has a defective keyboard. The keyboard is a Mitsumi with normal keys, but membrane type contacts. When I press the contacts (gently) with a plastic stylus ...
6
votes
1answer
404 views

What exactly were those 808X computers that would switch to 80386 upon Ctrl-Alt-Del?

A while ago I've been told that some generic-brand PC, (yet packed on an IBM5150 case) had the ability to become a 80386 upon pressing Ctrl-Alt-Del (warm reboot) ? I guess there might have been (for ...
13
votes
1answer
347 views

Which FPU for my Mac?

I have an LC III that has been overclocked to 33.3 MHz. I'm not sure what speed FPU I should buy - do I match the clock speed, or the bus speed? What kind of FPU should I put in this one?
4
votes
2answers
501 views

Why do mac LC network cards take an FPU?

I have several LC PDS network cards for my older LC's and they all have a socket which I assume is for an FPU... Given that I might be able to obtain said FPU for a few bucks, does anyone know what ...
5
votes
2answers
660 views

How were analytics gathered on software built for retrocomputing platforms?

In modern software development, it is a common practice to include some kind of analytics tracking software to see how customers are using your software, what a typical user flow of the application is,...
13
votes
5answers
1k views

Tool used to develop videogames with an Atari ST

I am a owner of Atari ST, and I would like to know software and tools used for the programmers for this computer to program mainly video games. For example: IDE used Language (I think it was Basic, ...
10
votes
2answers
291 views

Official explanation for offering both BOOPSI and GadTools?

Was there ever an official explanation on why AmigaOS 2.0 offered two similar GUI gadget toolkits, in the form of BOOPSI and GadTools? Or, to put it in another way, why were not GadTools gadgets ...
15
votes
3answers
410 views

What are the normal signals on a 65C02 in an Apple IIe?

I'm troubleshooting a dead Apple IIe enhanced, and I'm having trouble finding documentation on testing the 65C02 (as opposed to the 6502). Specifically, I've found using a logic probe that pin 6 (...
13
votes
2answers
837 views

How can I build Gameboy Development Kit 2.1.5 on a modern Unix/Mac platform?

Continuing with my quest to build the Infinity Game Boy Color source code, I am trying to build the Unix source of GBDK 2.1.5 on my macOS El Capitan machine. Trying to make the files in the lib ...
6
votes
1answer
143 views

PLATO & JS99'er

Has anyone out there managed to load a PLATO PHM 3122 cartridge by Control Data into the JS99'er emulator? That way a user could place all of the PLATO Lesson Disks on a cloud location (e.g., ...
8
votes
3answers
528 views

Was The Telemark Assembler available for the Unix or Mac Environments?

I'm trying to build the recently released Infinity Game Boy Color source code on my macOS El Capitan box. The original development environment was a Windows box, and I'm trying to modify the build ...
8
votes
1answer
402 views

Why would a PAL Amiga sometimes start up in NTSC display mode?

For an OCS Amiga (Workbench 1.2 or 1.3) I remember sometimes after a Guru Meditation/software failure reboot, Workbench would be restricted to NTSC size displays (200 non-interlaced vertical lines in ...
4
votes
4answers
364 views

Can input lag be modeled as a function of controller cable length for SNES?

While playing on my SNES, I almost yanked my controller out of my console due to the cable being so short. I went on Amazon to buy a cable extender, and then started reading on different forums that ...
8
votes
0answers
355 views

How can I open an IBM G50 CRT monitor?

First off, I know CRTs are dangerous and I have opened and discharged multiple CRT displays before. I've got an G50 monitor that shows a picture for a second or two and then goes blank. If you power ...
4
votes
1answer
1k views

Atari 2600 shows no signs of life when power is applied?

I have an Atari 2600 that does not appear turn on at all. I bought it from some guy in a garage sale. I believe he said it stopped working after a storm. I bought a new power supply in case the ...
6
votes
0answers
252 views

Where can I find “Nemesis II”, the sequel to “Nemesis”, an old CP/M game?

In 1981, the "Nemesis" game was released for CP/M-based machines by Super Soft Inc., with the author attribution of Michael A. Pagels and Michael Q Hiller, and artist attribution of Diana J. Bush. ...
28
votes
2answers
3k views

How does the NES Light Gun work?

Modern motion detection video game systems (Wii/Wii U, Xbox Kinect, PS Move, etc.) need sensors to read for motion and user input. However, when you play Duck Hunt (and some other games) on the NES, ...
14
votes
2answers
1k views

How are 6502 and 65C02 JMP(abs) processed internally

An infamous "feature" of the 6502 is that the JMP(abs) opcode will fetch the lower byte of the jump target from the address in the instruction, and fetch the upper byte of the jump target from the ...
27
votes
1answer
9k views

Why is a BIOS dump not required to emulate Nintendo 64 games in most modern emulators?

In order to emulate some home consoles (Playstation 1/2, Sega Saturn/CD/32x, etc.) a dump of the system's BIOS is required to emulate the console. Out of the Nintendo 64 emulators I have found online,...
12
votes
2answers
964 views

What exactly are the differences between Kickstart 1.2 and 1.3?

The only very known difference is that Kickstart 1.3 fixes the silly bug that prevented Kickstart 1.2 to boot from a hard disk (a routine in the boot code uses A6 loaded with an incorrect library base,...
9
votes
2answers
739 views

Why did Commodore not upgrade OCS straightforwardly to 32-bit architecture?

This is somewhat of a speculative question... Amiga's 1985 Original Chip Set is inherently a 16bit architecture (the data bus is 16bit, registers are 16bit, the blitter itself is 16 state machines ...
8
votes
1answer
671 views

Saving the screen on a ZX Spectrum without the prompt

Saving the screen on a Spectrum will typically get part of it obscured with the message “Start tape, then press any key.”: How might one save the screen image from Sinclair BASIC without it being ...
4
votes
1answer
2k views

Building a DOS/Win95/98 computer from scratch [closed]

I'd like to build a DOS/Win95/98 computer in order to play old PC games I have without emulation. Here are a few games I'd like to run: Teranova: Strike Force Centauri; System Shock 1 and 2; Half-...
18
votes
7answers
1k views

Retrocomputing Software Development Process/Methodologies

This is a test question based on this meta post. If the question can be reworded to be more on-topic, please feel free to suggest improvements. This is an open ended question about software ...
6
votes
2answers
1k views

Why have computers used so many different video connectors? [closed]

Over the years and with the large variety of hardware I've dealt with I've used quite a few of different video inputs and outputs. While I usually have no issue just plugging cables into devices, I ...
13
votes
2answers
1k views

What is a use case for the JAM instruction on the MOS Technology 650x family of processors?

I was reading about undocumented opcodes for the 650x family of processors and discovered JAM, an instruction "which simply causes the CPU to freeze, requiring a hardware reset or power cycle to ...
16
votes
1answer
3k views

How Did the 10NES lockout chip work?

One of the differences between the Japanese Famicom and the NES released outside of Japan is that the NES shipped with a lockout chip which prevented bootleg and imported games from working on the ...
10
votes
3answers
1k views

Why are the PPU registers on the NES mirrored?

The NES Picture Processing Unit has eight memory-mapped registers to the CPU in registers $2000 to $2007. The are incompletely decoded, so they are mirrored every 8 bytes from register $2008 to $...
3
votes
2answers
582 views

Dual-booting Windows 98 on an iMac G3

Is it possible to dual boot Windows 98 or Windows 95 on an iMac G3 running Mac OS 9.2?
15
votes
2answers
9k views

What are the differences between the Japanese Famicom and American NES?

In Japan, Nintendo's first home console was sold as the Family Computer (Famicom), while in the US it was later sold as the Nintendo Entertainment System (NES). Other than the region lock out for ...
7
votes
3answers
292 views

Building hello world on a Macintosh IIfx with mpw

I'm trying to compile a hello world object using mpw... I've created a file called hello.c on my desktop, contents are as follows: #include <stdio.h> int main(void){ printf("hello world!\n"); ...
11
votes
1answer
482 views

Why didn't Apple ][ / ][+ 80-column cards use slot 7?

Based on a previous question about how slot 7 on the ][ / ][+ was unique as it had two video signals on it that other slots lacked, I am curious why the slot wasn't taken more advantage of. But that ...
9
votes
1answer
494 views

How did the ITT 2020 graphics differ from the Apple ][?

Following on from this question about Apple ][ graphics: What makes slot 7 of the Apple ][ unique from 1-6 and how was this used? The original Apple ][ microcomputer was released for the US market ...
15
votes
2answers
3k views

How does one bypass the region lock on Japanese Super Famicom?

I recently bought a Super Famicom on my trip to Japan. However, the console is region locked so you can't play American SNES games. It seems to be that the plastic cartridge doesn't fit in the console ...
18
votes
2answers
1k views

What makes slot 7 of the Apple ][ unique from 1-6 and how was this used?

In the Apple II, there are three unique slots (depending on model): Slot 0 (on the ][ / ][+) which is typically used for language cards. "Aux" slots in the //e and IIgs, typically used for memory ...
4
votes
2answers
135 views

Macintosh LC III Internal Speaker not working

I have an LC III that I had recapped, both the power supply and logic board were recapped and cleaned, on receiving it back everything worked with flying colors, but now (only a week later) the ...
20
votes
1answer
616 views

Logo of a bow tie guy with a spoon

I was in the Computer History Museum in Silicon Valley last week, and I saw this badge. I know I've seen that logo somewhere before, but I can't remember where! Does anyone know where it's from?
11
votes
1answer
2k views

Game Boy DMG to VGA

I have a Game Boy DMG with a broken screen that I want to turn into a small arcade machine, so I need to display the Game Boy screen on a bigger (computer) screen. I tried doing so with an Arduino. I ...
23
votes
2answers
2k views

Can the two CPUs in a commodore 128 run at the same time?

The Commodore 128 has two CPUs. One is some variant of the 6502, and the other is a Z80. One CPU is there for compatibility with the Commodore 64, and the other is there presumably to give basic ...
9
votes
2answers
220 views

What method does the game Tau Ceti use to spell-check its commands?

This was originally going to be an identify-this-game question but I found the game I was looking for! I played Tau Ceti when I was a kid and I remember being amazed by how it would accept spelling ...
2
votes
1answer
2k views

No sound on SheepShaver for Windows 10

I am running Mac OS 9 through SheepShaver on Windows 10, and I can't get sound to work. I am using an Old World ROM because the New World ROM doesn't work, it causes SheepShaver to crash. I tried to ...
10
votes
0answers
358 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 ...
15
votes
2answers
273 views

Powering up old desktop games

I have half a dozen or more "desktop" games from the early 80's, which are single-title LED based battery powered games from Tomy and CGL. I've got Frogger, Caveman, PacMan and others: (stock images, ...
10
votes
4answers
4k views

How do I attach and use a CD-ROM drive to an Amiga?

I would like to add a CD-ROM drive to an Amiga. I have not tried this for several years and I remember things failing to work without giving any useful errors, multiple choices of device and ...
2
votes
2answers
229 views

Desktop folder locked in SheepShaver

I am using SheepShaver on Windows 10, and I enabled the option that allows SheepShaver to put a My PC icon so I could access files from my actual PC. However, when I try to drag files from My PC to ...
4
votes
4answers
423 views

Where are the memory controllers for IBM 5150 or Altair 8800?

Wikipedia page for memory controller states that memory controllers are either part of the northbridge, or in more recent cases, integrated into the processor. But AFAIK, neither IBM 5150 nor Altair ...
8
votes
3answers
2k views

Extended ROMs on the Amiga CD32 and CDTV

Continuing my series of questions about Amiga ROMs :-) The Commodore CDTV contained a normal Kickstart 1.3 ROM, plus an "extended ROM". From http://www.l8r.net/technical/cdtv-technical.html: The ...
7
votes
2answers
842 views

Transferring data from Spectrum +3 disk to tape/.TAP etc

I've recently found a number of my own programs (very old!) on Spectrum +3 discs, and I'm about to get hold of a working +3. Assuming the discs are readable, I'd like to transfer the programs (mostly ...

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