User hippietrail

38 votes

3 answers

11k views

What was the first operating system to be called an "operating system"?

asked Jun 8 at 4:43

24 votes

7 answers

4k views

Was it possible programmatically to manipulate the volume as well as the pitch on computers with no sound chip?

hardware programming sound

asked May 3, 2020 at 2:20

15 votes

3 answers

1k views

Are there games for the C128 that run (mainly) on the Z80 rather than the 6502?

z80 cp-m commodore-128

asked Apr 14, 2020 at 2:31

14 votes

1 answer

716 views

Did the Samsung SPC-650 have any hardware or firmware differences to the genuine Sinclair Spectrum+?

history hardware zx-spectrum zx-spectrum-clones spectrum-plus

asked May 1, 2020 at 6:52

12 votes

2 answers

1k views

Did the Commodore 128's Z80 CPU also have full access to the machine's custom hardware?

z80 programming commodore-128

asked Apr 14, 2020 at 6:44

11 votes

1 answer

168 views

In TRS-80 parlance when talking about disks, what are "granules" and "lumps"?

floppy-disk trs-80 terminology trs-80-model-iii

asked May 29, 2020 at 16:17

10 votes

1 answer

552 views

Understanding the DMK disk image file format used by TRS-80 emulators

floppy-disk emulation file-format disk-image trs-80

asked Jun 22, 2020 at 4:12

10 votes

2 answers

1k views

What tape format did the Nintendo Famicom Data Recorder use?

cassette-tape file-format famicom

asked May 22 at 1:17

9 votes

0 answers

118 views

On the TRS-80 models I and III when is the directory track number written in the third byte of sector zero, and when in the second byte?

floppy-disk operating-system trs-80

asked Jun 22, 2020 at 3:45

8 votes

2 answers

1k views

Are .COM executable binaries real mode or protected mode?

ms-dos x86 protected-mode real-mode executables

asked Apr 25, 2020 at 6:36

8 votes

1 answer

582 views

Did the Timex Sinclair 2068 and the Sinclair ZX Interface 2 use totally different hardware and software techniques?

hardware zx-spectrum game-cartridge timex-sinclair

asked Apr 26, 2020 at 11:10

7 votes

2 answers

819 views

Why does the .z80 emulator-snapshot format have separate fields for the 8-bit refresh register and bit 7 of R?

z80 zx-spectrum emulation file-format tape-image

asked Apr 13, 2020 at 14:37

7 votes

2 answers

2k views

Could Tandy TRS-80 Color Computers boot from disk at all?

floppy-disk boot trs-80 coco

asked Jun 5, 2020 at 2:46

7 votes

2 answers

1k views

How can I programmatically determine whether an Apple II .dsk disk image is a DOS .do image or a ProDOS .po image?

apple-ii programming file-format disk-image

asked Jun 3, 2020 at 0:38

7 votes

1 answer

345 views

Was the Ram Turbo the only 3rd party Interface 2 ROM cartridge interface for the ZX Spectrum or were there others?

hardware zx-spectrum game-cartridge

asked Jul 21, 2020 at 13:59

7 votes

1 answer

384 views

Did OSes write the floppy's logical sector number resulting from sector interleave/skew in the IDAM sector ID, or was it up to the OS?

floppy-disk cp-m microbee

asked Jul 22, 2020 at 12:29

7 votes

1 answer

344 views

What floppy disk format and layout and what disk image format are used for the Coleco Adam?

floppy-disk file-format disk-image coleco

asked Aug 8, 2020 at 7:04

6 votes

2 answers

902 views

What was the first microcomputer capable of working with Japanese kanji?

history 8-bit-microcomputers

asked Aug 14, 2020 at 12:36

6 votes

2 answers

742 views

Did any ZX Spectrum clones use the Z80's interrupt mode zero?

z80 interrupt zx-spectrum-clones

asked Jun 14, 2021 at 5:31

5 votes

1 answer

311 views

At which RAM address is the Microbee disk boot sector loaded and executed?

floppy-disk boot microbee

asked Jul 18, 2020 at 3:50

5 votes

1 answer

117 views

Length of leader block in Coco and Dragon cassette tape header and .cas tape image file format

cassette-tape coco tape-image dragon-32

asked Jun 6, 2020 at 4:49

5 votes

2 answers

762 views

Does Sinclair Spectrum BASIC have a maximum length for one line?

zx-spectrum basic

asked May 18, 2020 at 1:34

5 votes

4 answers

516 views

How did the Spectrum clones with TR-DOS and paged memory load and run code files from disk?

floppy-disk zx-spectrum file-system zx-spectrum-clones tr-dos

asked Apr 23, 2020 at 6:59

5 votes

4 answers

1k views

How does the Spectrum +3 know whether a disk is bootable or not?

floppy-disk zx-spectrum boot disk-image spectrum-plus-3

asked Apr 30, 2020 at 6:36

4 votes

3 answers

359 views

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

floppy-disk zx-spectrum file-system disk-image spectrum-plus-3

asked Apr 30, 2020 at 6:46

4 votes

1 answer

343 views

What did "double track" mean in relation to floppy disks?

floppy-disk floppy-drive terminology spectrum-plus-3 amstrad

asked May 3, 2020 at 4:30

4 votes

1 answer

230 views

Determining which sectors in an Apple II floppy disk/image are used when the boot sector declares more than 1 sectors

apple-ii floppy-disk boot disk-image

asked Jul 1, 2020 at 3:34

4 votes

0 answers

151 views

What does a "DK" signature mean at the start of track 0 sector 3 of a Dragon 32/64 floppy disk?

floppy-disk operating-system boot dragon-32

asked Jul 5, 2020 at 2:05

3 votes

0 answers

214 views

Do the Tandy CoCo and the Dragon 32 & 64 use all the same disk image file formats?

emulation file-format disk-image coco dragon-32

asked Jul 5, 2020 at 2:50

3 votes

2 answers

3k views

How can I get MAME to run modified ROMs whose checksums don't match the originals?

emulation rom arcade mame

asked Jul 28, 2020 at 3:31

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48 Questions

What was the first operating system to be called an "operating system"?

Was it possible programmatically to manipulate the volume as well as the pitch on computers with no sound chip?

Are there games for the C128 that run (mainly) on the Z80 rather than the 6502?

Did the Samsung SPC-650 have any hardware or firmware differences to the genuine Sinclair Spectrum+?

Did the Commodore 128's Z80 CPU also have full access to the machine's custom hardware?

In TRS-80 parlance when talking about disks, what are "granules" and "lumps"?

Understanding the DMK disk image file format used by TRS-80 emulators

What tape format did the Nintendo Famicom Data Recorder use?

On the TRS-80 models I and III when is the directory track number written in the third byte of sector zero, and when in the second byte?

Are .COM executable binaries real mode or protected mode?

Did the Timex Sinclair 2068 and the Sinclair ZX Interface 2 use totally different hardware and software techniques?

Why does the .z80 emulator-snapshot format have separate fields for the 8-bit refresh register and bit 7 of R?

Could Tandy TRS-80 Color Computers boot from disk at all?

How can I programmatically determine whether an Apple II .dsk disk image is a DOS .do image or a ProDOS .po image?

Was the Ram Turbo the only 3rd party Interface 2 ROM cartridge interface for the ZX Spectrum or were there others?

Did OSes write the floppy's logical sector number resulting from sector interleave/skew in the IDAM sector ID, or was it up to the OS?

What floppy disk format and layout and what disk image format are used for the Coleco Adam?

What was the first microcomputer capable of working with Japanese kanji?

Did any ZX Spectrum clones use the Z80's interrupt mode zero?

At which RAM address is the Microbee disk boot sector loaded and executed?

Length of leader block in Coco and Dragon cassette tape header and .cas tape image file format

Does Sinclair Spectrum BASIC have a maximum length for one line?

How did the Spectrum clones with TR-DOS and paged memory load and run code files from disk?

How does the Spectrum +3 know whether a disk is bootable or not?

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

What did "double track" mean in relation to floppy disks?

Determining which sectors in an Apple II floppy disk/image are used when the boot sector declares more than 1 sectors

What does a "DK" signature mean at the start of track 0 sector 3 of a Dragon 32/64 floppy disk?

Do the Tandy CoCo and the Dragon 32 & 64 use all the same disk image file formats?

How can I get MAME to run modified ROMs whose checksums don't match the originals?