User cjs

43

votes

1

answer

5k

views

Where and when did the `0x` convention for hexadecimal literals originate?

history hexadecimal

Aug 20 at 13:37 chicks 281

5

26

votes

3

answers

14k

views

What does a Nintendo Game Boy do when turned on without a game cartridge inserted?

game-boy

Jul 22 '19 at 8:19 Kaz 6,879

2

25

votes

3

answers

3k

views

What are uses of the byte after BRK instruction on 6502?

6502 interrupt

Sep 13 '19 at 9:02 Community♦ 1

5

19

votes

1

answer

2k

views

When low-level formatting a floppy, how does one ensure any existing sector markers are overwritten?

floppy-disk

Mar 2 at 13:08 bodgit 253

1

19

votes

1

answer

1k

views

How does the C64 get an accurate TOD clock on 50 Hz power?

commodore-64 power

Nov 13 at 12:32 Raffzahn 112k

3

16

votes

4

answers

2k

views

Why is the unchangable Nintendo Game Boy logo in the cartridge?

game-boy

Aug 13 at 1:51 hippietrail 3,167

1

16

votes

1

answer

1k

views

What's the timeline of Motorola 6800-family CPUs from 1974 to 1979?

6800

Aug 14 '19 at 11:38 cjs 16.9k

2

15

votes

3

answers

1k

views

For how long can you safely stop the clock on an NMOS 6502?

6502 dma

Apr 16 at 15:02 hotpaw2 5,344

1

15

votes

1

answer

2k

views

Why did the Apple IIe use a 2 MHz-rated 6502, even though it ran at only 1 MHz?

apple-ii 6502

Mar 17 at 3:32 cjs 16.9k

2

15

votes

1

answer

656

views

Under what circumstances would RAM locations 0 and 1 be written and/or read on the C64?

commodore-64 memory

Jan 3 at 21:39 Community♦ 1

6

14

votes

3

answers

2k

views

What LISP compilers and interpreters were available for 8-bit machines?

history 8-bit-microcomputers lisp

Sep 21 '19 at 5:59 cjs 16.9k

3

14

votes

3

answers

1k

views

How did the Altair 8800 front panel load the program counter?

altair-8800 front-panel

Sep 1 '19 at 12:18 Community♦ 1

2

12

votes

3

answers

710

views

How do you send code to a Commodore disk drive and run it?

commodore disk-drive

Sep 7 at 11:08 OmarL 26.4k

1

12

votes

5

answers

2k

views

Why isn't the WDC 65816 available in “externally” 16-bit versions?

65816

May 7 at 22:41 Will Hartung 6,443

1

12

votes

0

answers

467

views

Why did some MOS 6502 packages have holes in them?

6502 chip

Mar 28 at 9:29 Community♦ 1

1

12

votes

1

answer

496

views

How did the Apple 1 video circuit work?

video apple-1

Jan 22 at 5:42 cjs 16.9k

3

12

votes

2

answers

890

views

What are my modern options for loading programs and data files on the Apple IIc?

apple-ii data-transfer

Nov 13 at 1:00 Nick Westgate 5,762

1

12

votes

1

answer

1k

views

On what Apple II and II+ keyboards can the ']' character be generated?

apple-ii keyboards

Oct 9 '19 at 8:36 Community♦ 1

11

votes

2

answers

906

views

Did all integrated Commodore PET monitors always use 60 Hz refresh?

commodore crt-monitor commodore-pet

Dec 13 at 2:31 cjs 16.9k

1

10

votes

4

answers

710

views

Did any devices use the Commodore 64 joystick ports as outputs or two-way communications ports?

commodore-64 commodore joystick vic-20 input-devices

Sep 15 at 15:59 Retrograde 2,155

3

10

votes

1

answer

778

views

Why did the C64 use a separate “CAN” +5 V power supply for some chips?

commodore-64 power

Apr 9 at 11:11 Michael Graf 3,495

3

9

votes

1

answer

424

views

How do I clean/refurbish an Apple IIc Keyboard?

apple-ii keyboards maintenance

Sep 15 at 18:03 Community♦ 1

1

9

votes

1

answer

395

views

What is the C64 disk drive “Jiffy” protocol?

commodore-64 floppy-drive

Nov 15 at 13:56 Joe 1,475

9

votes

1

answer

361

views

What is the exact bus protocol used by the C64/C128 REU?

commodore-64 commodore-128 dma

Nov 13 at 17:16 Brian H 43.5k

9

votes

4

answers

681

views

Which cartridges were typically used together on Commodore 64 systems?

commodore-64 game-cartridge

Oct 29 '19 at 16:04 Brian H 43.5k

1

9

votes

1

answer

2k

views

What was the first LISP compiler?

history compilers lisp

Sep 21 '19 at 5:59 cjs 16.9k

9

votes

3

answers

603

views

Why did 1970s front panels prefer momentary toggle switches to push buttons?

front-panel

Sep 8 '19 at 0:11 Community♦ 1

1

8

votes

2

answers

1k

views

Is the Game Boy Sharp LR35902 object-compatible with the 8080/Z-80?

z80 8080 game-boy

May 4 at 8:00 Community♦ 1

1

8

votes

2

answers

408

views

What are the most common Apple II disk image formats and what hardware disk drive emulators can use them?

apple-ii floppy-disk floppy-drive disk-image

May 1 at 7:23 Community♦ 1

8

votes

1

answer

563

views

Why did the Commodore PET 2001 take so long to ship?

commodore commodore-pet

Apr 13 at 14:11 Brian H 43.5k

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74 Questions

Where and when did the `0x` convention for hexadecimal literals originate?

What does a Nintendo Game Boy do when turned on without a game cartridge inserted?

What are uses of the byte after BRK instruction on 6502?

When low-level formatting a floppy, how does one ensure any existing sector markers are overwritten?

How does the C64 get an accurate TOD clock on 50 Hz power?

Why is the unchangable Nintendo Game Boy logo in the cartridge?

What's the timeline of Motorola 6800-family CPUs from 1974 to 1979?

For how long can you safely stop the clock on an NMOS 6502?

Why did the Apple IIe use a 2 MHz-rated 6502, even though it ran at only 1 MHz?

Under what circumstances would RAM locations 0 and 1 be written and/or read on the C64?

What LISP compilers and interpreters were available for 8-bit machines?

How did the Altair 8800 front panel load the program counter?

How do you send code to a Commodore disk drive and run it?

Why isn't the WDC 65816 available in “externally” 16-bit versions?

Why did some MOS 6502 packages have holes in them?

How did the Apple 1 video circuit work?

What are my modern options for loading programs and data files on the Apple IIc?

On what Apple II and II+ keyboards can the ']' character be generated?

Did all integrated Commodore PET monitors always use 60 Hz refresh?

Did any devices use the Commodore 64 joystick ports as outputs or two-way communications ports?

Why did the C64 use a separate “CAN” +5 V power supply for some chips?

How do I clean/refurbish an Apple IIc Keyboard?

What is the C64 disk drive “Jiffy” protocol?

What is the exact bus protocol used by the C64/C128 REU?

Which cartridges were typically used together on Commodore 64 systems?

What was the first LISP compiler?

Why did 1970s front panels prefer momentary toggle switches to push buttons?

Is the Game Boy Sharp LR35902 object-compatible with the 8080/Z-80?

What are the most common Apple II disk image formats and what hardware disk drive emulators can use them?

Why did the Commodore PET 2001 take so long to ship?