User cjs

48 votes

1 answer

6k views

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

asked Aug 16, 2020 at 3:43

31 votes

3 answers

4k views

How did the IBM 5153 color display detect and modify the signal to make low-intensity yellow into "brown"?

asked Jul 27, 2022 at 6:58

29 votes

3 answers

6k views

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

asked Sep 11, 2019 at 10:13

27 votes

3 answers

26k views

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

asked Jul 21, 2019 at 7:51

22 votes

5 answers

5k views

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

asked Jul 21, 2019 at 5:45

22 votes

1 answer

3k views

How does the C64 get an accurate TOD clock on both 60 Hz and 50 Hz power?

asked Nov 12, 2019 at 3:57

21 votes

2 answers

1k views

How did LaFarr Stuart's "Forth without an input buffer" work?

asked Sep 16, 2022 at 4:56

21 votes

1 answer

994 views

How did "Super Wonder Boy (in Monsterland)" defeat the Multiface One?

asked Jul 27 at 19:13

20 votes

4 answers

4k views

What is the serial protocol commonly used over RS-232 (among other links) and where did it come from?

asked May 29 at 22:01

20 votes

1 answer

3k views

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

asked Mar 1, 2020 at 16:58

20 votes

3 answers

4k views

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

asked Jun 2, 2019 at 0:55

19 votes

3 answers

2k views

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

asked Aug 31, 2019 at 2:59

18 votes

1 answer

2k views

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

asked Jul 30, 2019 at 6:52

18 votes

1 answer

2k views

How did the Apple 1 video circuit work?

asked Dec 31, 2019 at 4:06

17 votes

3 answers

2k views

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

asked Apr 12, 2020 at 10:45

17 votes

1 answer

3k views

Why was the 6502 version of Microsoft BASIC coded like the 8080 and 6800 versions even though this was rather inefficient?

asked Jun 6, 2022 at 7:13

16 votes

1 answer

1k views

Why did some MOS 6502 packages have holes in them?

asked Mar 10, 2020 at 4:15

16 votes

5 answers

3k views

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

asked Dec 11, 2019 at 1:58

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?

asked Mar 17, 2020 at 3:32

15 votes

2 answers

6k views

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

asked Jul 24, 2019 at 11:49

15 votes

1 answer

1k views

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

asked Sep 21, 2019 at 6:31

14 votes

1 answer

1k views

Why is the original Altair BASIC (for the 8080 CPU) source code not available on-line?

asked Jul 26, 2019 at 11:38

13 votes

1 answer

1k views

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

asked Nov 13, 2019 at 7:26

13 votes

1 answer

3k views

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

asked Oct 8, 2019 at 4:57

12 votes

3 answers

2k views

How do I clean/refurbish an Apple IIc Keyboard?

asked Nov 22, 2019 at 7:43

12 votes

2 answers

1k views

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

asked Nov 11, 2019 at 23:48

12 votes

3 answers

2k views

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

asked Sep 8, 2019 at 16:16

11 votes

1 answer

3k views

What was the first Lisp implementation that could generate machine code?

asked Sep 9, 2019 at 3:44

11 votes

3 answers

891 views

What are examples of providing non-RST instructions for 8080 interrupts?

asked Aug 23, 2019 at 20:55

11 votes

2 answers

1k views

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

asked Dec 12, 2019 at 17:42

Stack Exchange Network

95 Questions

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

How did the IBM 5153 color display detect and modify the signal to make low-intensity yellow into "brown"?

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

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

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

How does the C64 get an accurate TOD clock on both 60 Hz and 50 Hz power?

How did LaFarr Stuart's "Forth without an input buffer" work?

How did "Super Wonder Boy (in Monsterland)" defeat the Multiface One?

What is the serial protocol commonly used over RS-232 (among other links) and where did it come from?

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

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

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

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

How did the Apple 1 video circuit work?

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

Why was the 6502 version of Microsoft BASIC coded like the 8080 and 6800 versions even though this was rather inefficient?

Why did some MOS 6502 packages have holes in them?

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

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

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

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

Why is the original Altair BASIC (for the 8080 CPU) source code not available on-line?

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

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

How do I clean/refurbish an Apple IIc Keyboard?

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

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

What was the first Lisp implementation that could generate machine code?

What are examples of providing non-RST instructions for 8080 interrupts?

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