Newest Questions
6,483 questions
1vote
1answer
155views
How can I detect a machine's cassette output as a microphone on a PC and therefore save to it?
I've seen a related question or two about the possibility of saving from a vintage machine to PC audio but not on this specific issue I think. I would like to save cassette audio directly from - in ...
11votes
6answers
781views
(In)significance of spaces in parsing Fortran IV
I'm analyzing a Fortran IV program written for a PDP-10. I was briefly acquainted with the language but had never studied it. Now I have a couple Fortran reference manuals (IV and 77), and I'm ...
1vote
0answers
100views
Windows 2000 setup unable to access disks on Samsung NP-NC110
I recently dug up my old Samsung NP-NC110, which is a not-so-formidable notebook from the early 2010s. I'm currently trying to install Windows 2000 on it as a fun project, since I already have a main ...
17votes
7answers
3kviews
How did PC games reproduce PCM sounds on PC speakers using PWM when speakers had poor frequency response?
The method I am referring to is visible in videos such as these: https://www.youtube.com/watch?v=Wu5zd5fCaPA https://youtu.be/fWDxdoRTZPc?si=cqPRdGtLAR_uAfK7&t=509 The PC speaker from what I ...
3votes
0answers
146views
CF Card Issues - DIY Z80 COMPUTER from scratch - CP/M frozen after boot
has anyone here ever had a similar problem? I'm basically trying to use my CF card interface board that used to work with another memory card, which unfortunately got damaged (my fault). Now I only ...
10votes
1answer
1kviews
Did the Akiko have any other developer-useable features than Chunky-to-planar?
The Amiga CD32 had an additional chip not found on other AGA machines, the Akiko. This is listed as having two main uses: It's the CD-ROM Controller in the system (which doesn't seem like something a ...
2votes
1answer
209views
Communication between the CPU and the microcontroller through the (pre-)ISA bus
Studying part of the code of firmware from the Datamaster, I wasn't able to find the I/O ports for the NEC765. Observing the hardware I have observed what it seems to be a 8048[1] in between both ...
8votes
1answer
819views
What do these labels/mnemonics mean on Mitsumi D539W dual (3.5" + 5.25") floppy drive jumpers?
What do the jumpers control on a Mitsumi D539W drive, as in below photo? I've looked but can't find documentation for this specific drive, which has one cable connector for 2 individual floppy drives -...
1vote
0answers
215views
What do these errors mean in Windows XP Professional? [closed]
I have an old PC with Windows XP Professional installed. It was working normally. The PC is connected to a Biesse machine (model Rover A3.30 manufactured in 2007). This machine is operated by software ...
4votes
0answers
136views
I need a proper datasheet for КР580ВГ75 (KR580VG75, Soviet Intel 8275 clone)
I am repairing an IBM System/23 Datamaster model 5322, which has its original CRTC faulty and needs to be replaced. I have tried various Intel 8275 and some others from dubious origin as they seem ...
7votes
3answers
1kviews
What is the line separator (end of line) character of textfiles of the VMS operating system?
CP/M and MS-DOS had several characteristics are derived from DEC operating systems, such as Control-Z EOF, the coloned device name (drive letter) prefix of file identifiers, 3-character filename ...
2votes
1answer
161views
What is this C64 game where you have to free a kidnapped soccer champion?
I think this game was unique. The plot is to free a soccer champion who was kidnapped (!) before the match start, so the game is action. If you have success and free the kidnapped champion you can ...
1vote
2answers
320views
What was the reason why Bill Gates gave Apple a capital injection? [duplicate]
There is this idea that the capital injection that Apple got from Microsoft and Bill Gates was some sort of noble gesture, but I always thought was the case that this was purely a business deal. ...
-4votes
1answer
165views
What has Apple's motivation for wanting your old devices back? [closed]
It seems that this trade-in practice of trying to get old Apple devices off the market is as old as the Apple company itself. I just wonder where this practice comes from because all other electronic ...
17votes
3answers
2kviews
How did EBCDIC files on IBM mainframes identify newlines?
I recently uncovered some old VM/CMS files that I archived around 30 years ago and have been looking at them out of curiosity. Since these were from an IBM System/370XA and VM/CMS, they're in EBCDIC ...