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13

The PCjr supports three-voice audio; the Tandy 1000 copied that so running games in Tandy mode should work on a PCjr too. Some games might need a small program to switch to three-voice audio on first. Both the PCjr and Tandy 1000 support 16-colour graphics in 320×200, but many games which run on Tandy machines don't work on the PCjr. There is a simple ...


10

There are some USB drives which support double-density disks and formats, but as you suspect, not all of them. It is still worth trying a plain format a: to see what it does — USB drives control formatting themselves, so this should do the right thing if it supports double-density disks. If you have a Linux system handy, you can determine your drives’ ...


10

Note: As I don't have a computer with Windows 10, I do not know whether it helps there as well, but this worked for me on Windows 7. I do have a Fuji USB floppy drive (Not sure if this is the same type, but read on). It worked well with 1.44M floppies, but did not work for 720k disks with the original driver. The following procedure made it work: Go to ...


7

I found that more recent versions of Windows no longer support the /F: parameter. However, (with internal floppy drives at least) I've been able to format 720K with /T:80 /N:9 for 80 tracks and 9 sectors.


6

The Tandy 1000 CGA output was essentially like the IBM CGA electrically, and graphics modes were compatible. There was, however, an important difference in text mode. In text mode, the CGA used the middle 200 scan lines of a 262-line frame to display 25 rows of 8 scan lines each, with generous borders on the top and bottom. Using 8 lines per character ...


4

According to this post on Mike’s PCjr forum, the audio mod should only require connecting pins 5 and 9 (and perhaps 2) on the MC15429. However even that’s apparently not necessary: this other post has a small program which switches audio to Tandy mode and back.


3

CGA 40-column text mode is 320x200 16-colors and 80-column text mode is 640x200 16 colors. Those are a completely standard feature of CGA and therefore a completely normal thing for a CGA monitor to display. But because they're text mode, you can't set arbitrary pixels to arbitrary colors, you have to use the character cells. Tandy and PCjr advanced ...


3

Basically yes. TGA (1000EX or similar) signal output (colour/intensity and sync signals) and connector pinout is upward compatible to CGA, thus compatible with CGA monitors. Both produce the very same RGBI signal using the same timing and encoding. TGA just employs more memory, thus being able to supply more colours at higher resolutions. After all, TGA is ...


3

This will work with the USB floppy drive you have mentioned, a Chuanganzhuo one, using Windows 10. You have to use a proper Double Density floppy disk, not a High Density one. I tried it with a High Density floppy disk and it gave me Parameters not supported by drive. C:\Users\J>format a: /T:80 /N:9 Insert new disk for drive A: and press ENTER when ...


2

I successfully formated 720K on win10 by respecting the two conditions: only some chipsets (in the USB drive) support 720K, usually older chipsets the drive must detect the floppy as a 720K Point 2 is sometime an issue if you use 1.44 floppy disks. I only have those so I usually put a paper to hide the hole in the floppy cases indicating the 1.44 MB format....


1

Get a used IBM usb Floppy drive from ebay. Tested year 2003 and 2009 version MPF82E. Both of them can read/write/format 720k disks. Works with windows 10 1803 and windows 7/xp.


1

I worked for a commercial reseller of similar machines back in the early 90s. The combination of BIOS and DOS of those machines at the time did not recognise/support formatting in 720KB, but the hardware/DOS was able to use those formats after the diskettes were formatted on those new formats. At the time, I wrote a routine for formating 720KB diskettes ...


1

The only way I could use a batch of unused 720k disks, designated as '3.5" - 2D, 135TPI, Double Sided, Double Density, 1MB (720K)' was to use a FULL format, not a Quick format. This took 11.5 minutes for each disk! On checking the properties, the capacity was given as 1,457,664 bytes, 1.38MB, but the free space was shown as 799,744 bytes, 781KB, and the used ...


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