Brian H
  • Member for 4 years, 11 months
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Defining zeropage address labels in xa assembler?
Accepted answer
2 votes

This code achieves the output you want: tmp1=$00 tmp2=$01 * = $100 lda $12 sta tmp1 lda $34 sta tmp2 I don't think the segment identifiers are really intended to be used in ...

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I need to find a controller card for an apple II 5.25 inch floppy drive, the 20 pin connector wont work on the 34 pin controller card i have
2 votes

Your question is confusing because there is not a 34-pin option for a 5.25" floppy disk drive that is directly compatible with an Apple ][ floppy controller card. This link describes all the ...

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Max length of traces / wires for MC680x0 relocator
2 votes

According to the project page on GitHub for the Open68000Relocator board: The board has been tested and proved to be working perfectly with a TF530 card running at 50 MHz. So, if you can use the ...

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Is it possible in Commodore BASIC V2.0 to configure the system so that the PRINT command does not update color?
2 votes

The "problem" with a screen text rendering routine that also sets the color of each character cell it outputs is performance. It requires two writes for each character, but only one is required if you ...

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What are the differences between the various HxC Floppy Emulator hardware options when used with an Apple II?
2 votes

The HxC/Gotek floppy emulators are designed to work with a Shugart type floppy interface, which was widely used in many retro-computers, but is not directly compatible with the Apple ][ floppy ...

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Software Failure after RAM upgrade Amitek Hawk
Accepted answer
2 votes

This is most likely indicating a problem with the RAM added by your expansion card. You can usually diagnose these problems better by booting with a diagnostics floppy. I would recommend trying the ...

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Tools for creating disk images on Mac Plus
2 votes

I recommend trying Copy II Mac, but not to make a disk image. Rather, use it to successfully copy your original floppy disk to the floppy emulator/drive. You may even be able to use it to edit the ...

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How can I debug a Mac OS Classic application?
2 votes

While the Jasik Debugger is probably the most capable tool, and appears to still be available for purchase, there is also TMON. TMON has more capability than MacBugs, and is designed to explore the ...

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Is it possible to chemically remove spray paint from 1990's PC cases (specifically the plastic front covers)?
2 votes

In a recent video, RetroManCave demonstrates stripping the paint off a plastic TRS-80 case using methylated spirits. This will remove all the paint, thus affording you the option to leave the plastic ...

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When and where was the first home computer game convention held?
2 votes

Evidence about early informal meet-ups of game developers and gamers is probably lost to history, but there is plenty of documentation about the first major conventions that are still held annually. ...

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68k macintosh lowmem system globals
2 votes

Your description leaves me a little confused about the global variables you are actually searching for. Code in the ROM sets up a whole bunch of global values, and these are only sparsely documented. ...

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80s DRAM chips: one per bit of data bus width?
2 votes

It was very common in 1980s systems to utilize DRAM chips that output 4 bits. Common variants were 256Kb DRAM chips accessed as 64K x 4 bits, and 1Mb chips accessed as 256K x 4 bits. Thus, a 16-bit ...

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Connecting an Apple //e with a Super Serial Card to an Android device via a USB to DB25 cable
2 votes

I do not expect it is practical. The reason you can connect the Apple to RPi is that the USB port on the RPi is designed to be a host to USB slave devices - for this case, it is hosting a USB slave ...

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Spontaneous movement and game crashes from active-low joystick routines
1 votes

Assuming the FIRE button on joy1 is pressed, then your joypad1 should store the value %11101111. In order to check this, using your constants: lda joypad1 and #JOYSTICK_FIRE bne JoyNotFire ; handle ...

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PS/2 Keyboard not working on Windows 95 and MS-DOS
1 votes

Many vintage PCs have a PS/2 port that can be configured (via jumpers, BIOS, or both) to work as either PS/2 keyboard, PS/2 mouse, or combined keyboard+mouse with a Y-cable adapter. Having the port ...

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Using a GSM (2G) cellphone as a modem to send code
1 votes

The GSM standard defined a digital cellular network. Therefore, it has always been capable of doing data communications, computer-to-computer, from the very beginning. Nowadays, most public networks ...

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A1200 Amitek Hawk, Guru Meditation 8000 000B when loading games from Gotek
1 votes

I think the first question to answer is whether booting from a game floppy image via the Gotek is the best way to achieve game compatibility with an expanded Amiga. In my experience, compatibility is ...

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HDD data recovery advice
1 votes

If you are mainly concerned about successfully recovering the data, then the safest route is to hand it over to a trustworthy data recovery professional. They will have more knowledge and tools at ...

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

I think the canonical example from the 16-bit era is the two ports on the Macintosh provided by a single Zilog 8530 and able to be used for serial, printer, modem, and AppleTalk networking based on ...

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Could Apple II cards be used on any 6502 platform?
1 votes

I believe the major factors, besides just the electrical characteristics of the bus, are: Standardization of access to each slot, such that each is guaranteed certain resources that cannot conflict ...

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What are the Ultra-Highres registers in ECS and AGA for?
1 votes

I think you are not taking into account both of the new video modes supported by the Amiga ECS chipset using the higher dot clock: Super-Hires Mode: 1280 pixel horizontal resolution, interlaced or ...

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Amiga Workbench copy command just outputs 'copy mode'
Accepted answer
1 votes

It looks to me like your previous commands, before the failed command, resulted in you copying the entirety of the FBlit/ directory from your RAM:Temp/ source directory to somewhere else - and ...

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What is the highest version of System 7 that can be run on a Mac SE/30?
1 votes

Based on my experience with the SE/30 and the Mac IIci/IIsi, I'd recommend System 7.1, and I'd also recommend installing it alongside a 32-bit clean ROM using the Mac ROM-inator II. The benefit of ...

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What interface did Video Backup System use?
1 votes

LGR (Lazy Games Review) just published an excellent review of a related VHS backup system for the PC, known as the Danmere Backer. See video on YouTube. While I don't have any experience with the VBS ...

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Booting from SD card on a Compaq LTE 4/75 – DOS 6 works, Windows 95 doesn't
0 votes

You didn't specify what you are using for an emulated environment to create images, but I'll assume it is DOSBox. I routinely use DOSBox to create DOS disk images on my modern Linux machine and ...

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Non-obvious compatibility of M1297 monitor
0 votes

While the M1297 is an excellent quality Trinitron CRT, it will be quite difficult to use it with anything other than the various color Macintosh systems for which it was designed. The main issue is ...

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How did the Amiga 500 left-side expansion port work?
0 votes

Another fairly common expansion, which was not an accelerator, RAM, or 68k compatible, was the PC compatibility card containing an x86 compatible CPU. In fact, one of the first hyped Amiga sidecar ...

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According to Steve Jobs in 1981, what computer privacy issue was "very very hot in the media" at that time?
-1 votes

Steve Jobs was probably referring to the abortion issue, which was framed by SCOTUS as a Privacy issue, and was a rapidly growing source of division in American politics in the early-1980s. The SCOTUS ...

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Source code control on an MS-DOS system
-2 votes

All source code revision control systems before 'git' sucked to various degrees. You are going to find many faults with the limited compatible choices. So, your best bet, by far, is to just "roll your ...

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Why does the single dot entry exist in file systems?
-3 votes

The contrarian view is that the use of "." to represent the current directory is not a necessary feature, and is not really a "feature" at all. Rather, it is a legacy of unsophisticated command-line ...

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