The mTCP guy checks in here once in a while. And he is a PCjr expert too. :-) On a low-spec machine (PC, XT, PCjr) I use mTCP exclusively - it is small enough to run from a floppy and fast on those machines. On my 386-40 and better machines I'll use both MS LANMAN and mTCP. You can't have both …

FTP isn't cheating and it isn't half-assed. It is the original file sharing program. ;-0 Mike (The PCjr and mTCP guy)

Argh! Website here: http://www.brutman.com/Cassette_Waveforms/Cas … _Waveforms.html

OldThrashbarg pointed it out, but I think it deserves a picture because it was so cool ... http://www.brutman.com/Cassette_Waveforms/High_Zoom.jpg And here is the original page that it came from. I had a lot of fun poking around with a pretty normal sound editor, zooming in and finding my ones and …

Putty is good - if I'm not on a Linux machine that is what I use. The BBS seems to be holding up. It hasn't had a significant amount of testing, but still we've had 3 people on at the same time and nobody could detect anything running slowly. Over 59000 TCP/IP packets have come in in the last day …

It's running again! Please drop in and help me test it ... For those of you who are new, it is a new Telnet BBS that I am writing running on an IBM PCjr. I have written all of the TCP/IP code and the BBS code from scratch. The only thing I didn't write was the packet driver for the Ethernet adapter …

Yes, but that's far from what dosbox tries to achieve. The cycles are only a rough estimate and are not bound to the cycles per instruction of a real CPU, so this'd be hard to implement anyways. Yep - I have to remember that this is an emulator, not a simulator. Simulators can be cycle accurate, …

Forgot a few details ... On a 64K system the setup is similar, except that the top of memory is reported to BASIC as 48K. Also, you are not allowed to grow the video buffer at all ... the special PCjr modes are not available without a 128K system. And worse, DOS 2.1 won't run on that machine. I …

Re: Speed of the first 128K Remember the first 128K of memory is slower than any other memory because of the VGA access. So using a constant like 500 might average things out enough to be usable, but it's not going to be perfect. Perfect is actually close to impossible without knowing the memory …

I'm blown away by this thread .. a Jr emulator! One question about the emulation - the VGA chip (Video Gate Array) maps references from B800:0000 down to a window in the first 128K of RAM. The window can actually move - device drivers like PCJRMEM or JRCONFIG move it. Does the emulator handle this …