MiSTer FPGA Forum

theflynn49

Hello ... FIY : I just published a new core with the 32-byte fifo cache and a few more fixes. it's here : TRS-80_20241123.rbf It works well with TRSDOS and a term program like "termws2" from W.D.Schroeder (1979) It has a few quirks with LDOS/LCOMM, but then it has lower case ! yes :D All CPU speed work but 2400 bauds requires x3 or x12 CP...

theflynn49

A setting like "TCP_TERM_TRANS = PETSKII" in MidiLink.INI I think I see what you mean. and in my mind this was specifically made for the C64. Thanks to bring the point to my attention, it may fix future compatibility problems easily. The TRS-80 has different problems, it has difficulties to display lower cases and it is too slow to handl...

theflynn49

@rhester : The hardware doesn't care how the characters are encoded. It's up to the Comm software to deal with that.
LDOS/LCOMM has a translation character feature, but its usable for a few characters only.

theflynn49

If someone finds a terminal program that displays lowercases, please tell me. I think I tried every one of them, they send lower case characters, but none seems to be able to display them. For my tests I mostly used "Terminal Program (1979)(William D Schroeder)[CMD]" (a huge 512 bytes CMD file named termws2.cmd) FYI the "X" fiel...

theflynn49

@ericgus09 : I just committed a release with the RS232 interface. You can wait for Sorgelig to merge it in a few days, or get it there =>
TRS-80_20241122.rbf

Hope you like it. Don't go too fast, even at x12 speed, the TRS80 is not fast enough to go over 4800 bauds or something.
jF

(Edit: I just made another new release, so I edited the link)

theflynn49

@dshadoff : thank you for these informations, the app was "TERM" I think I found it too in ver 1.5. The system80 rom from Dick Smith had an imbedded term program too, but it has been removed from the ROM provided with the core. I see you are one of the main contributors a few years ago, I hope you find my changes compatible with your orig...

theflynn49

@ericgus09 thank you for the links, it saves some time. Maybe you know what could be qualified as "the best" TRS80-Model I application that used a rs232 add-on ? And what that add-on was ? that's what I am looking for. We don't want to invent some rs232; we want to emulate some specific rs232 add-on that was used by some commonly used app...

theflynn49

Hello, and thank you all for the good vibes. @Kathleen : as Akeley suggested, the Model II is too different from the others, and is more office oriented since it has nearly no graphics except to draw tables. As Mister is more game-oriented, ... Eventually it will be done, but meanwhile I suggest you try an emulator like trs80gp , which works everyw...

theflynn49

Many thanks for all the kind words and the thanks. It makes me hopeful that a community may arise to keep this core alive and that's making me happy. I know dev time is hard to find these days, but end user tests and experiments are essential to core progress. @rcade : going to Model III is a good goal; there are not many differences with the Model...

theflynn49

Hello...

I just spent a few weeks to make some fixes to the disk controller and the keyboard of this core, so LDOS is now loading and running fine.
Other DOSes should be improved as well. It will be published soon.

Feedback welcome, if someone is interested, as where to go from this point may be a cool subject of discussion ...

Rgds,
jF

theflynn49

Thank you for this ! (I rushed to be the first to thank you lol)
Kinda piece of history, I guess.

theflynn49

Interesting.
There is a page in smspower with all the known bioses : https://www.smspower.org/Development/BIOSes

Some change could be made to Mister to add a bios load parameter, instead of loading the mboot.mif file by default, but that's some work because for the moment it's statically loaded.

theflynn49

Honestly I do not fully understand your question. As far as i know, there is no such thing as a 'custom bios', and I don't really see any reason to make or have one. This bios just initialize registers and memory to make games work. I am not even sure that the original machine has a bios. What could happen is that an exotic game does not work becau...

theflynn49

It's embedded. The compile process generates the file mboot.mif, which is loaded during the core generation by Quartus into a memory array.
It's not the original BIOS, it has been rewritten.

theflynn49

Hi,
There is a bios-replacement file in SMSBootLoader/smsboot.asm which initialize some ram and some registers if I remember correctly.
It does different things if SMS or GG is detected/selected.
Control is passed to the rom bios at reset.

If BIOS is disabled, this just doesn't happen. Some exotic games need this I guess.
hope this helps.

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