47

The manual says that the smallest resolution it can handle is 800x600. That is almost certainly the key. Original VGA supported 640x480 16-colors and 720x400 (essentially a small step up from the 720x350 monochrome (MDA) text, but with color). While VGA has come to mean "any video card and monitor that uses a blue 15-pin connector" that's not what ...


23

Per the developers of PSIO, the answer is no: Exactly why is [the internal modification] required? There are two signals that PSIO needs in order to function that are not present on the expansion port. These are the CS (Chip Select) and INT (Interrupt) lines from the CD controller. The job of the Switch Board is to basically forward them as well as connect ...


22

DOS is almost surely not outputting 800x600 or up, and is probably in the ballpark of 720x350 or thereabouts. Further, it's likely 70Hz, which this adapter may not like. I'd recommend you get a display that can use the signal from card natively -- any old multiscan CRT and lots of early LCDs can do this -- but if you're determined to use this adapter, you ...


11

I posted a comment on the reverse-engineering Q&A you linked before I realized it'd do better as an answer here. The answerer there found that googling Accom and Axial from your photo turns up a series of video editing controllers, and documentation for a DE-9 connector. If it's an editing controller running RS-422 over DE-9, it's almost certainly Sony 9-...


11

Does anyone know hard or time consuming it would be to achieve this? Assuming you have a modern PC with VGA out, or you can put in a graphics card with VGA out, it's not hard at all, if you know a bit about how this works. You need to look up the horizontal and vertical sync frequencies that your monitor operates with (use the documentation, or google for ...


8

The Apple IIc monitor (A2M4043) mentioned in the question takes a composite video signal. Some older laptops and graphics cards output composite or S-Video either directly or through a breakout cable. Otherwise, an external graphics adapter that interfaces to the PC via USB and outputs VGA is about $10-15. Once you're working in the analog domain, you have a ...


7

The standard text mode for VGA DOS was 80 by 25 characters, which translated to a resolution of 720 by 400 (characters of 9 by 16 pixels) per the table on VGA text mode page in Wikipedia. One option would be to change the mode and see if you can get the resolution high enough for your converter, but that would depend on the capabilities of the graphics ...


6

Options: (1) Googling "Accom axial" finds various people who bought it, made Youtube reviews etc. If these are not you, contact them and see if they have details. (2) As has been mentioned in the comments, you need a RS422 (not RS232) adapter, e.g. to USB. The cheapest I found after a quick search is 20 EUR. (3) You can often find the serial ...


5

VGA was a huge and very bold rejection of NTSC! TLDR of this whole history section: VGA and NTSC have nothing to do with each other. VGA was a blank-sheet design that smashed NTSC limitations with extreme prejudice - and planned to never, ever, ever go back. Apple IIc monitors, like most monitors of that age, use the NTSC composite video standard in all ...


4

Creating a composite signal for a monochrome monitor should be quite easy. I remember using 4 or 5 resistors to mix green, brightness, HSync and VSync from a 9-pin EGA output to construct a perfectly usable composite video signal. You will probably not find CGA or EGA adapter in 2020, but the standard 15-pin VGA looks almost as easy. The timing in VGA is ...


4

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 supported 512KiB of CHIP RAM. But this was soon replaced by "Fat Agnus" in the A2000 that supported 512K x 16 (or 1MiB) of CHIP RAM using 19 address lines. ...


3

RGBI to RGB only needs a couple of diodes and resistors, see e.g. here, and that will work with VGA-RGB. I am not aware off-the-shelf ones for that are available, OTOH they are not exactly difficult to make yourself. I have no idea what @mnem means by "RGBA", usually this is an abbreviation for red-green-blue-alpha, and refers to how image data is ...


3

Raspberry Pi has composite video out built in. There's a QA here which has details relevant to configuration. One of those with the appropriate adapter/cable may be the easiest way to get that old-fashioned experience you're looking for.


2

I used Xmodem and variants to transfer to/from my 286 via RS232. I remember that Data General had a program called BLAST although I suspect that it was a wrapper for Ymodem protocol. Not long before that I wrote a driver for 110-baud 20mA current loop to interface a BBC micro to a teletype that I had acquired, which had a paper tape punch. Sadly I was ...


2

On minicomputers, not quite the focus of this question, in the 1970s we used post office leased lines to transfer files. My very first professional project was to implement a remote job entry station, i.e., transfer files (representing cards) to a remote mainframe and transfer files (representing printouts) back. This was communicating between a 16-bit ...


2

There's two things here. First, where there was a need for ad-hoc transfers Kermit was very popular, supported (in the case of Lowbrow University when I worked there) by a campus-wide Gandalf network. Second, where there was a need to e.g. create installation media there were commercial boxes which supported all possible types of drive and several OSes (8&...


2

You could maybe solve the 2-step conversion in 2 separate steps: Belkin used to offer a Sun keyboard/mouse to PS/2 adapter as part of their KVM product line (these adapters seem to be available fairly cheaply from eBay ). Once you have a standard PS/2 connectpr, converting that to USB should be possible with standard adapters for PCs.


1

Sort of - there is the tonyhax tool that allows you to softmod an unmodified PS1. There is a nice table on that page that shows which versions of the console it will work with. Specifically, FreePSXBoot is probably what you are looking for - it lets you use a special memorycard with tonyhax on it to softmod the console. Here is a video by Modern Vintage ...


1

There are some solutions you could try. You can search for a monochrome VGA (actually they are multisync monitors. Search on ebay for an IBM 4707 or an IBM 8503/8504 for that 90s look. While you are at it and are lucky you could find a complete PS/2 you could use as a terminal or even try to run an older version of Linux of it (Model 90 were 486 and pentiums,...


1

CF should work. I guess this may help you: Connect the CF to your computer, no BIOS settings needed. Boot from floppy to the DOS Use utilities like WhatIDE or IDEInfo. They tell you how the system "see" the CF card (if so) You can find more details here or here.


1

Modern hard drives tend to list a CHS geometry of some large number of cylinders, 16 heads, 63 sectors. I'm reading the label on an 18GB IBM Travelstar for that; as CHS only goes up to about 8GB, the listed settings wouldn't cover the entire capacity of the drive. I think it's better to have the correct number of heads and sectors. It may then be possible ...


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