Brian H
  • Member for 4 years, 11 months
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Transforming a memory dump into something loadable
6 votes

Maybe I'm confused by your question, but have you tried LOAD'ing the PRG file? Loading memory is done with write operations. Write operations ignore ROM banking and always go to the underlying RAM ...

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Swapping endian-ness on the 68000
6 votes

Since you mentioned the Amiga in your question, it ought to be relevant as to how this problem was solved efficiently on that system. As I understand, the "glue" logic for the Bridgeboards ...

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What was the Macintosh's BOM cost?
6 votes

The incremental cost, or "BOM cost", of the original 128K Macintosh was approximately $750 at the time. This answer is trivially determined from the 1982-83 Apple Computer Inc. public financial ...

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Multiple mass storage controllers on Amiga 500 or 2000
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6 votes

The Amiga can support multiple mass storage controllers, subject to the following necessary limitations: Any time multiple controllers are using AutoConfig, each controller must correctly support the ...

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Audio from Commodore 64 to line 1/4 inch line level
Accepted answer
6 votes

Yes. What you have on the RCA plug coming from the C64 is line level mono audio. You can connect it to a mixer using an RCA-to-phono adapter that fits your mixer. Often times, the phono jacks on ...

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What home computer was the first to use a external ROM cartridge?
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6 votes

The Atari 400/800 and the original Texas Instruments TI-99/4 were both released at approximately the same time in 1979, and both featured a user-accessible edge connector designed to accept the plug-...

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Recover files from Dell PP04L Hard Drive
6 votes

A laptop of the vintage you mention will most likely have a 2.5-inch IDE, PATA (Parallel ATA), hard disk drive. Of course, you will need to disassemble the laptop and remove the drive to confirm. Once ...

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What was the difference between the original Video Toaster and the 4000 version?
Accepted answer
6 votes

The Video Toaster 4000 capabilities were delivered as both a hardware and software upgrade to the original Video Toaster. Hardware wise, the video processors were improved on the 4000 to include many ...

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How can I upscale the video output of a Nintendo 64 for low-latency and high quality graphics on an HDTV?
6 votes

It depends on whether you also want to modify the N64 to support RGB output. Without modification, the best output to use from the N64 is S-video. Cables are commonly available on eBay for the N64 ...

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Could the Z80 do interference-free video as the 6502 could?
5 votes

TL/DR; As you stated in the question: "Many cycles don't need RAM access, but many do, and which particular ones do and do not depend on the instruction mix. There is no "do nothing" ...

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How did Apple IIc daughtercard expansions work?
5 votes

All the Apple //c machines from September 1986 onward have an additional 34-pin header on the motherboard designed for memory expansion boards. Apple offered their own expansion board which support up ...

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How do I detect if AmigaDOS dos.library/CurrentDir() fails?
Accepted answer
5 votes

The only thing CurrentDir() does is change the lock in your process structure that is used as the process' current directory, and return the old value. So, it is the return value of Lock() applied to ...

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What tricks or techniques were used to speed up AmigaOS boot
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5 votes

In general, booting an Amiga from an HDD is quite fast, and can certainly be far less than 30 seconds even when a significant number of drivers and small applications are loaded via commands in S:...

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What exactly has the windows OS relationship been towards MS server offerings?
5 votes

Background: Windows NT was the basis for all Microsoft Windows "Server" Operating Systems that had that name. Previous iterations of MS networking products were mostly add-on device drivers for simple ...

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8 registers in the 9440?
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5 votes

Looking over the data sheet referenced, there is also an Instruction Register, and a "Bus Register". The IR is obvious. The BR seems to perform a similar function for fetched data (not instructions). ...

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Which cartridges were typically used together on Commodore 64 systems?
5 votes

The most common usage for an expansion bus extender was to simply eliminate the wear-and-tear on the computer's expansion connector from frequently swapping cartridges in and out. Instead, the ...

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What's the difference between an IBM 5153 (CGA) CRT picture tube and a color TV picture tube?
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5 votes

If you took all the electronics from a monitor like the IBM 5153 and substituted just the picture tube from a color TV, what would still be lacking in terms of display quality? The answer to your ...

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Was Objective-C really a hindrance to Apple software development?
5 votes

It should be fairly evident that Objective-C has not hindered the growth of software in Apple's "ecosystem". For this, you only need to look at the success of the App Store. Recall that iOS (...

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Were external floppy drives for Atari ST and Amiga inter-compatible?
5 votes

The Amiga and Atari ST were not compatible on either the floppy media format or on their floppy drives. The wiring is completely incompatible between the computer and the external floppy drives, most ...

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What changes made some Atari ST software incompatible with the Atari TT?
5 votes

The question is sort of broad, since there are many ways to write software that targets the specifics of ST hardware, and which leads to programmer assumptions that break when the hardware changes ...

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How to create fast an icon file for Amiga program in WB drawer?
Accepted answer
5 votes

Various authors have created utility programs for AmigaOS that will automatically create .info files and associate them with your Amiga programs, thus making the program or data file launch-able via a ...

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What are all the known file extensions for Atari 8-bit disk/tape/cartridge images?
5 votes

In practical terms, what really matters is which Atari 8-bit binary image formats and extensions are recognized by the popular Atari 8-bit emulators. Emulators (especially open-source ones that can ...

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When did energy saving start to become important?
5 votes

Power savings has always been critical for microprocessors and other integrated circuits because of the physics of heat transfer. The more heat generated per unit of area on chip, the more aggressive ...

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1980's PC educational game where you build robots
5 votes

I believe you are referring to ChipWits, by Epyx software. It was quite popular at the time.

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How to get the inner dimension for Amiga Intuition window with GIMMEZEROZERO Flag?
Accepted answer
4 votes

The intuition.h file (looking at Kickstart v2.04) defines the Window type to contain the following member variables: /* These variables have the mouse coordinates relative to the * inner-Window of ...

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Can Alice be hacked to use more than 2MB Chip Ram
Accepted answer
4 votes

TL;DR The Amiga AGA Alice chip can only support 2MiB of CHIP RAM because it has 20 address lines, and thus allows 2^20 (1M) by 16-bit memory access. The first Agnus chip found in the A1000 only ...

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How to write Apple IIgs .po disk images to Floppy Disks with an older Mac
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4 votes

It is rather straight-forward, technically speaking, to share both 3.5" floppy disks and their image files between a Classic Mac (e.g. MacOS System 7) and an Apple IIgs. This because both systems ...

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Running WarpCopy64 on an emulator
4 votes

Using VICE 3.4 on Linux, I am able to activate the Ethernet cartridge peripheral in the emulator and launch the WarpCopy64 server. To fully test, I'd just need a Windows machine on my LAN to run the ...

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Amiga 500 WorkBench 1.2 Freezes
4 votes

Workbench 1.2 is known to have some bugs, and it would be better if you could boot into Workbench 1.3 instead. Based on your description, I suspect your mouse could be malfunctioning. It sounds like ...

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Price of original Apple ][ in 1980?
Accepted answer
4 votes

Using the many helpful comments given, and reviewing dealer pricing of the Apple II and II Plus in old issues of Byte magazine from 1979/80, I've come up with what I think is a reasonable explanation ...

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