All Questions

Filter by
Sorted by
Tagged with
0
votes
1answer
211 views

Commodore – The Inside Story [closed]

Commodore – The Inside Story, by David Pleasance, who was a manager in Commodore UK. Sounds like a very interesting book, supposedly available, but when I look on Amazon, hoping in particular for the ...
0
votes
2answers
650 views

What 486 motherboard is this, with American Megatrends BIOS identifying is DPAQ-6156-043090-KF?

I've got an early 486 motherboard that doesn't seem to have a manufacturer name or FCC number on it and I'm having trouble identifying it. I've placed some photos of the motherboard in this Imgur ...
0
votes
1answer
519 views

VGA to CGA (RGBI) signal

Does anybody know how I can go from an analog RGB signal to a TTL RGBI signal? Is there a good circuit for this out there somewhere?
0
votes
2answers
153 views

Z80 - “LD (nn), dd” command cycle [closed]

For a university assignment, I have to describe and draw the command cycle of the LD (nn), dd command. To be exact, I was given this command: LD (0x1000), BC which I interpret as putting the low ...
0
votes
1answer
104 views

Keys on Omnikey Inverted T Ultra

On my Inverted T ultra keyboard, the SF9 key and the number pad asterisk (*) keys perform the same function; the num pad equal (=) key and the F7 keys are similarly tied together. I don't know if this ...
0
votes
1answer
248 views

4MHz Z80 timing and PAL video generation

Im trying to get some nice colored lines on some old Z80 system synced to the PAL screen, but having some sort of a problem. First I just need to know if my facts are right. I know that on Commodore ...
0
votes
3answers
350 views

The earliest a home-computer or home-robot could be interfaced with a commercially available camera?

What was the earliest date a home-computer or home-robot could be interfaced with a commercially available tv-camera or digital-camera . Although I'm asking this question for the purpose of computer-...
0
votes
1answer
163 views

Does this schematic of the Zilog Z80 central unit contain any other errors? [closed]

For an assigment I have to check this schematic of an Z80 and find possible errors. The schematic looks like this: The left side of this schematic is correct, but we have to find errors in the right ...
0
votes
1answer
427 views

Help me identify game from 90s

I can remember below pointers off the top of my head: It was an adventurous game We had to cross different levels (can relate to Mario for instance) The protagonist was short and was wearing a cop ...
0
votes
1answer
192 views

Workbench 3.1 Chipsets and graphics question

I have Workbench 3.1 install with Scalos and some other tweaks installed from scratch using one of numerous online guides. My machine is a CDTV with 3.1 Kickstart, TF536 030 MMU 64MB RAM. The chipsets ...
0
votes
1answer
279 views

What's the heritage of 80286? [closed]

80186 introduced some instructions for HLL features. 80286 introduced some instructions for protected mode, and provided some multitasking ability with external MMU which was never intended for PCs ...
0
votes
1answer
166 views

Defining a C function with given address in cc65

I have a function that should be callable with the following syntax: void __fastcall__ initSIDplayer1(uint8_t a); The __fastcall__ modifier here means that the argument is passed in the Accu instead ...
0
votes
1answer
231 views

Will there have to be a concerted effort to train new developers for legacy systems? [closed]

If we consider legacy systems that are still crucial to modern life, say for instance ATM infrastructure. If they have been coded with old languages like Cobol, for instance, would there have to be an ...
0
votes
2answers
318 views

Reading 360k floppy disk in 1.2M drive

I formatted several 5.25" diskettes with 360k and 1.2M on the Windows XP PC using 1.2M (HD) drive. I am using the same drive to read data from 360k diskette back using custom driver. The controller ...
0
votes
2answers
180 views

How do I know where the file directory is stored on a Spectrum +3 disk layout?

I'm trying to parse Spectrum +3 disk images. I only ever had a tape-based Speccy back in the day. The +3 had a built-in floppy drive but was late to the party and not that successful. It had the same ...
0
votes
1answer
213 views

Is there such a thing as a modern-manufactured, flat, fake CRT TV? [closed]

CRT TVs were great, and an absolute must for all classic video games. However, it cannot be denied that it's impossible to buy a new CRT TV today, at least in any kind of normal store, and you rarely ...
0
votes
1answer
135 views

Identify version of UCSD P-System disks?

I have a DOS-hosted UCSD P-System running under DOSBox. The "boot" drive for it has to be IV, but the .VOL files that I have - from several sources - don't necessarily contain .CODE files ...
0
votes
1answer
114 views

iMac G3 as an external screen

I work as a teacher and I have a laptop model MacBook Pro. I like retro technology, so I bought an iMac G3, it works perfectly. I want to use iMac G3 like an extra screen for the laptop. I have a DVI ...
0
votes
3answers
216 views

c64 copy chars to sprite issue

How to do correct copying char to sprite ? Lets say 1st char is at $2000 second is at $2008 and copying to sprite at $2480. And with this we can copy 1 char to top left position of 1st sprite. But ...
0
votes
1answer
114 views

VICE loads files slowly on Fedora 32 Linux [closed]

I lately wanted to try some of the Commodore 64 games I have kept as D64 files on my Fedora Linux system using VICE. I have lately upgraded the system from Fedora 26 to Fedora 32. After I started up ...
0
votes
1answer
130 views

Carry flag in the Intel 8008

Datasheet for the Intel 8008 CPU mentions that the Carry (C) flag is affected with the logic operations (AND, OR, XOR), but it does not make any sense. I believe Carry will be zeroed, but I have no ...
0
votes
1answer
403 views

Best IRIX Integrated Development Environment for C++ Programming

I tried to install GCC on Irix, but it did not work. I tried to install Code::Blocks on Irix, and it did not work. The GCC gave me parse errors in iostream.h and streambuf.h, and NetScape does not ...
0
votes
1answer
187 views

Startup behavior of Gameboy - what to replicate in an emulator? [closed]

I'm new here. Let me know if this is the wrong place to ask this kind of question. I'm planning to build a Gameboy emulator. Before I start, I want to have a clear understanding of the startup ...
0
votes
1answer
104 views

How exactly does Leningrad contend the memory?

From what I understand of this answer, the Leningrad delays the Z80 during the M1 cycle so that the video generation circuitry can do its thing. I can see how M1 is "latched" (don't know if that's ...
0
votes
1answer
158 views

What did “double track” meaning in relation to floppy disks?

I mostly used 3½″ floppies back in the day but I also used 5¼″ floppies to some extent on Apple II's and TRS-80's. I was never exposed to 3″ floppy disks as used mainly on Amstrad microcomputers and ...
0
votes
1answer
144 views

How is the LCDC (LCD Control) register manipulated on the Gameboy?

I don't see it listed anywhere in the 0000-ffff address space. Is it controled by the CPU? Or something else entirely?
0
votes
2answers
225 views

IBM PC 5150 motherboard labelling

The motherboard of the IBM PC 5150 has labels of letters followed by numbers. What are the letters representing? Examples being U1, P1, C1, T1 and Y1. I am trying to ascertain which component is the ...
0
votes
1answer
176 views

PC for DMV knowledge test - since when? [closed]

I was watching a movie License to Drive (1988) where the character was doing a DMV (Department of Motor Vehicles) knowledge test on an interactive software on a PC. I was a bit surprised that such ...
0
votes
2answers
248 views

Behaviour of commas in PRINT at a line-end

Does anyone have actual documentation on how MS/Commodore BASIC handles line wrapping in PRINT statements? I tried this in an online emulator: PRINT 1,2,3,4,5,6,7,8,9,0 In this case it wraps at the ...
0
votes
1answer
137 views

Any Public Videos of Anyone Playing Jupiter Mission 1999?

When I was growing up, I played a game for the Atari 800 entitled "Jupiter Mission 1999", which has as a premise that you wake up in the middle of the night with astronauts at your door and ...
0
votes
1answer
79 views

WWDC2010 Game Demo, programmers use what format for 3D model and animation? [closed]

People in Apple Corporation make Quest game demo for WWDC in year 2010: • Game Design and Development for iPhone OS, Part 1 · Session 401 • Game Design and Development for iPhone OS, Part 2 · Session ...
0
votes
1answer
176 views

How picky are CRTs about power cleanliness?

How picky are CRTs about the 'cleanliness' of the mains power? Cleanliness referring to electrical noise from thing like ac motors in fridges, powerline ethernet, etc. Cleanliness is also referring ...
0
votes
1answer
305 views

What was this computer I remembered? [closed]

When I went to primary school in 1995 I remember the school had a classroom full of old computers. It took the school 2 years but eventually they did replace them with more modern systems. The two ...
0
votes
0answers
41 views

Was there an Evans & Sutherland display system capable of rendering ordinary data as motion through a landscape? [duplicate]

Around 1987, the investment bank I worked for had a high-end graphics device, possibly from Evans & Sutherland, which produced an "animated" display not unlike the view from the front ...
0
votes
0answers
85 views

Pavilion N3410 won’t recognize new hard drive issue [closed]

For retro gaming, It’s a HP Pavilion N3410 I got for 22$ and wanted to put Windows 98se on the new hard drive i have (80 gb). Problem is, it won’t let me boot to the boot floppy I have with the hard ...
0
votes
0answers
84 views

best port (on laptop) for using laptop display as monitor for an Amiga [duplicate]

i am looking to order an Amiga 500. i wanted to use my Thinkpad L420's display as a monitor, but it seems it doesn't have a port that would work for that. the thinkpad needs replacing anyways, so i ...
0
votes
0answers
153 views

Arcade game with a sit-down cabinet and vibrating seat

I don't know the name of an arcade game; can someone please help? When you go all the way to the ground, your ship turns into a car and your seat vibrates. In the last stage, your ship turns into ...
0
votes
0answers
66 views

Amstrad CPC 6128 - Key cap spring missing

Of course the unthinkable happened and I lost one cap key spring while cleaning the keyboard. I am still searching but assuming all things went south, what would be the best solution to replace them? ...
0
votes
0answers
61 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 ...
0
votes
2answers
339 views

CF partitions not showing up in Workbench

4GB Compact Flash KS 3.1 40.68 WB3.1 Latest WinUAE I just created a Compact Flash (compatible Transcend) partitions under Workbench on latest WinUAE using this guide. Despite following the steps my CF ...
0
votes
2answers
329 views

Understanding Mario and screen position in “NES-Super Mario Bros”

Objective - Play Mario game and record the score and position, and later map it to level map png (https://nesmaps.com/maps/SuperMarioBrothers/SuperMarioBrosWorld1-1Map.html) Method - I can get the ...
0
votes
0answers
114 views

Siemens PG675 monitor problem

I have been working on an old Siemens PG675 and suddenly the monitor began to show a a distorted image (it shows this 1 when the should shows this 2). I could make a test of the screen, and it shows ...
0
votes
0answers
120 views

Portable 386 that only ever beeps continuously; no video

I've acquired a late-80s portable 386 with builtin LCD in unknown working state. It only ever beeps continuously on boot, with no picture on either the built-in LCD or an external VGA-connected ...
0
votes
1answer
68 views

keyboard not operating electronica-bk-0100-01

I own a Electronica-bk-0100-01. I have only got around to connecting it up. Before that I opened up the system, checked for bad tracks, obvious issue etc. I also checked the end to end of the ...
0
votes
0answers
72 views

Composite video from C64 not being picked up by a modern Smart TV [duplicate]

I've purchased a Commodore 64 "as-is" from eBay. I tediously cleaned out the interior and removed all chips and dusted them out and put them back together. Still, no signal. Except for sound. So, I ...
0
votes
1answer
258 views

Do any of the open source Sinclair ZX Spectrum emulators support both TR-DOS and 3DOS?

The number of Spectrum emulators has been growing for decades now so there's quite a lot for different platforms and written in different languages. I'm interesting in learning about two of the disk ...
0
votes
0answers
441 views

Which machines, other than the PC-Engine, uses custom-waveform synthesis for sound?

The most common way retro machines made sounds were with programmable sound generators (PSG); there was a bunch of square waves, saw waves or noise channels at disposal. When technology evolved ...
-1
votes
4answers
422 views

Was it true that Microsoft actually created software for early Apple devices?

Is it really the case that there was a port of Microsoft Word and Excel that was one of the first really successful software to feature on a Apple device? Did Microsoft software actually have a ...
-1
votes
1answer
361 views

Why are there no actual complete and 100% verified/vetted ROM collections still? [closed]

Recently, I've been searching far and wide to collect, in digital form, the exact games that I owned as a child, or had temporarily, or rented/borrowed/played at somebody else's house, or never really ...
-1
votes
3answers
226 views

What exactly has the windows OS relationship been towards MS server offerings?

This question is related to this one. I always was understanding that windows the OS was a companion app of sort in regards to the server offerings and that, yes you could use it for home use, but it'...

15 30 50 per page