Unanswered Questions
322 questions with no upvoted or accepted answers
6
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Has any copy of 386/ix survived from before 1988?
According to Wikipedia:
PC/IX was succeeded by 386/ix in 1985, a System VR3 derivative. Later versions were termed INTERACTIVE UNIX System V/386 and based on System V 3.2, though with elements of BSD ...
- 2,014
1
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0
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148
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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 ...
- 26.4k
4
votes
0
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173
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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 ...
- 41
4
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141
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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 ...
- 1,716
3
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0
answers
140
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What might cause my Commodore 1541 and FSD-1 disk drives to have a bus conflict
I'm seeing some strange behavior on my Commodore 1541 and FSD-1 disk drives. Both drives seemingly work fine when attached to the C64 by themselves, but if I set the FSD-1 to be device 9,10 or 11 - ...
- 10.5k
4
votes
0
answers
242
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What AT clones supported XT keyboards?
Recently, I was researching IBM PC keyboards and their compatibility. I found out that there are a lot of misconceptions online about them.
First, there are two keyboard protocols that are not ...
- 802
5
votes
0
answers
183
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Who designed and manufactured the Intel imm8-90 high speed paper tape reader?
In the 1970s, Intel sold their Intellec series of microcomputers, as development systems for their 4004, 4040, 8008 and 8080 CPUs. The 8080 version (Intellec 8 Mod 80) was the system for which CP/M ...
- 242k
5
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148
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Did the CDC 7600 have a 'deadstart switch panel' like the 6600?
The CDC 6600 had a panel of 12 rows of 12 switches which was used to start the machine. A 12-word program for Peripheral Processor 0 (PP0) could be set up on the switches and loaded into PP0 memory, ...
- 39.6k
11
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282
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What was and where can I find OS-1 for the Z80?
On page 269 of the June 1980 issue of BYTE there is an advertisement from Electrolabs (in Stamford, CT) for an operating system called OS-1, a "new Unix-like operating system for Z-80."
Did ...
- 28.5k
3
votes
0
answers
129
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Looking for Hans Pufal's Comprehensive Computer Catalogue
During the 1990 Hans Pufal started to create a list of all (*1) computers ever made, he called it the
Comprehensive Computer Catalogue (CCC).
It was an incredible piece of work done by a very ...
- 242k
1
vote
0
answers
141
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How to connect USB ports on a Lucky Star Pegasus 5v-2 Socket 7 motherboard?
How to connect USB ports in slot cover on a Lucky Star Pegasus 5v-2 Motherboard? I have connect like from the Star 5v-1b , but it don't work. I plugged a USB mouse, but LED don't shine.
I tested with ,...
- 159
1
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0
answers
132
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TRS-80 Model 1 TRSDOS 2.3: What happens when a non-existent or un-loaded disk is accessed?
Back in the day I had a TRS-80 Model I. First with cassette, then StringyFloppy, then floppy disks with TRSDOS. It's long since gone and I miss it. So I wrote a Z80 emulator, then emulated a TRS-80 ...
- 242k
5
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0
answers
233
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Where to get DR-DOS 7.06 and 7.07?
I'd like to get a copy of DR-DOS 7.06 and 7.07, preferably as a free download, but I'm also ready to buy a copy. Where can I find them?
I've already looked at the first 40 web search results, none of ...
- 4,155
4
votes
0
answers
233
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What was the maximum capacity of a magnetic bubble memory module?
I've seen a handful of bubble memory modules from the 1980s (mostly made by HP and intended for laptop computers) on eBay, of which none exceeded 1 Mbit of storage capacity. There seem to have been ...
- 557
6
votes
0
answers
481
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Why does Super Mario Bros (NES) preemptively clear the hidden 1UP flag before Mario hits the block?
I'm analyzing the disassembled code of Super Mario Bros. (NES) and came across some logic related to hidden 1UP mushrooms. While debugging the game alongside the code, I noticed something unexpected: ...
- 26.4k