User cjs

44

votes

1

answer

5k

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

history hexadecimal

Aug 20 at 13:37 chicks 299

3

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1

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112

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How was the second bank of Apple IIc ROM accessed?

May 29 at 12:51 Alex Taylor 181

4

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0

answers

164

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How can I connect a PIA or VIA chip to the Apple IIc?

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Apr 17 at 4:29 Community♦ 1

1

2

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1

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73

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Where can I find original Apple DOS 3.3 System Master diskette images?

apple-dos

Apr 13 at 10:05 Raffzahn 128k

8

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1

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583

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

commodore commodore-pet

Apr 13 at 14:11 Brian H 46.4k

2

16

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3

answers

1k

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

6502 dma

Apr 16 at 15:02 hotpaw2 5,862

3

10

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1

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894

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

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Apr 9 '20 at 11:11 Michael Graf 6,321

1

6

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2

answers

236

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Why does _Beneath Apple DOS_ show FM encoding rather than GCR?

apple-ii floppy-disk

Apr 14 at 15:14 Community♦ 1

2

8

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2

answers

802

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What does Shift-RETURN do on Commodore's 8-bit computers?

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Apr 1 '20 at 21:57 Community♦ 1

3

votes

2

answers

172

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How exactly does the Apple II monitor set and use the “last opened” and “next changable” locations?

apple-ii firmware

Mar 31 '20 at 0:57 Community♦ 1

1

5

votes

2

answers

441

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Where did the “LEVI” file selector/runner for the Apple II DOS 3.3 come from?

apple-ii apple-dos identify-this-software

Apr 12 at 5:06 cjs 17.4k

6

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2

answers

426

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What's the timeline of Commodore diskette drives?

history floppy-disk commodore disk-drive commodore-pet

Apr 29 at 16:26 Wildcat Matt 331

3

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1

answer

274

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What was the history of Nanodata Corporation?

history

Jun 1 at 15:33 RSMilward 31

1

15

votes

1

answer

2k

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

apple-ii 6502

Mar 17 '20 at 3:32 cjs 17.4k

1

3

votes

1

answer

248

views

Is there any RAM disk software available for Apple II DOS 3.3?

apple-ii

Mar 13 '20 at 0:12 Nick Westgate 5,852

1

12

votes

0

answers

527

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Why did some MOS 6502 packages have holes in them?

6502 chip

Mar 28 '20 at 9:29 Community♦ 1

1

6

votes

8

answers

315

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What 8-bit microcomputer systems multiplexed multiple physical ports on a single controller?

hardware trs-80-model-100 ports

Mar 11 '20 at 3:37 supercat 19k

7

votes

1

answer

298

views

What is a “stunt box”?

history

Mar 5 '20 at 18:24 Solomon Slow 1,401

6

votes

3

answers

791

views

How does the Apple II read lines for video display from the text-mode frame buffer?

apple-ii video

Mar 13 '20 at 16:49 cjs 17.4k

1

8

votes

3

answers

431

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Were any Apple 1s sold with non-ROR 6502s?

mos-650x apple-1

Apr 10 '20 at 16:17 Community♦ 1

5

19

votes

1

answer

3k

views

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

floppy-disk

Mar 2 '20 at 13:08 bodgit 253

1

vote

0

answers

280

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How can I read/write/format 5.25" 40-track MFM floppies on modern systems?

floppy-disk floppy-drive

Jan 30 '20 at 2:16 cjs 17.4k

8

votes

4

answers

483

views

What's the easiest way to bring up a MACLISP REPL on modern machines?

lisp

Feb 5 '20 at 13:22 Lars Brinkhoff 1,777

2

votes

1

answer

243

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What is the format of the Apple 1 character set ROM?

video apple-1

Jan 21 '20 at 7:01 Community♦ 1

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1

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755

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How can I make an external PSU for an Apple IIc?

apple-ii power

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12

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619

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How did the Apple 1 video circuit work?

video apple-1

Jan 22 '20 at 5:42 cjs 17.4k

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930

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

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Dec 13 '19 at 2:31 cjs 17.4k

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13

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5

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

65816

May 7 at 22:41 Will Hartung 7,735

3

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2

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217

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What is the name/type of the Apple IIc case screws?

apple-ii screw

Nov 22 '19 at 21:23 cjs 17.4k

3

9

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1

answer

570

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How do I clean/refurbish an Apple IIc Keyboard?

apple-ii keyboards maintenance

Jan 13 at 19:00 Community♦ 1

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74 Questions

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

How was the second bank of Apple IIc ROM accessed?

How can I connect a PIA or VIA chip to the Apple IIc?

Where can I find original Apple DOS 3.3 System Master diskette images?

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

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

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

Why does _Beneath Apple DOS_ show FM encoding rather than GCR?

What does Shift-RETURN do on Commodore's 8-bit computers?

How exactly does the Apple II monitor set and use the “last opened” and “next changable” locations?

Where did the “LEVI” file selector/runner for the Apple II DOS 3.3 come from?

What's the timeline of Commodore diskette drives?

What was the history of Nanodata Corporation?

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

Is there any RAM disk software available for Apple II DOS 3.3?

Why did some MOS 6502 packages have holes in them?

What 8-bit microcomputer systems multiplexed multiple physical ports on a single controller?

What is a “stunt box”?

How does the Apple II read lines for video display from the text-mode frame buffer?

Were any Apple 1s sold with non-ROR 6502s?

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

How can I read/write/format 5.25" 40-track MFM floppies on modern systems?

What's the easiest way to bring up a MACLISP REPL on modern machines?

What is the format of the Apple 1 character set ROM?

How can I make an external PSU for an Apple IIc?

How did the Apple 1 video circuit work?

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

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

What is the name/type of the Apple IIc case screws?

How do I clean/refurbish an Apple IIc Keyboard?