archive.worldofdragon.org

Hi everyone,

Is anyone going to be at Silicon Dreams this weekend, I should hopefully be there both days.

Cheers.

Phill.

Most excellent, one of the reasons I thought about getting a 3D printer was to see if I could make a DOS cart case

Cheers.

Phill.

So how are you reading the EEPROM as a matter of interest ? The super lazy way... From memory (Cartridge -> ROM): !CTS (pin 32) is connected to the ROM's chip enable. R/!W (pin 18) is connected via the jumper to Write Enable. R/!W (pin 18) is connected through a NAND gate (wired to invert) to Outpu...

So how are you reading the EEPROM as a matter of interest ?

Cheers.

Phill.

Another thing to check (if you have not already), that I have seen cause a similar fault is the connection between DA0 on the VDG (Pin 22) and DA0 on the SAM (Pin 8).

Cheers.

Phill.

This involves two circuits, one is a 27256 (or bigger) that replaces IC18, and has the normal Dragon rom in the lower 16K and a slightly modified** CoCo 2 rom in the upper 16K , A14 is connected to a switch so that you can select between them. (1) Is there any particular reason for putting the Drag...

The DragonDOS / SuperDOS NMI handler would be a problem as it uses LEAS to drop the stacked registers and then does a RTS, this would fail as it is on a 6309 in native mode. Tha handler is NMISrv LDA dpcmdreg ; Read status register. CLRB ; Reset DP=0 TFR B,DP LEAS 12,S ; Drop registers from stack TS...

Hi all, Tape emulation is pretty much done and should work with a properly bit aligned cas file, such as the ones produced by Xroar. Cartridge image loading also works, and a cart can be loaded and auto-started, e.g. a game, or just loaded e.g. a utility. Tape and Cart emulation work on both the Dra...

zephyr wrote:And finally, here's a copy of SuperDOS E6 with the chain command bug fix. I have changed the version to E7 to avoid any confusion.

Humm except that I've been using E7 for the CoCo RS-DOS and Dragon Alpha ports for a while I have now patched the source with the fixed chain tho.

Cheers.

Phill.

Would be nice if we had details / source for the patches then I could merge them into the assembleable source code.

Cheers.

Phill.