Re: ti-emu: RE: A86: Re: new emulator

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Re: ti-emu: RE: A86: Re: new emulator


OH! That kinda problem... Well, when I was building my emulator (V86) I put 
into it an "XDebug" mode, where I have just a prompt, and can do anything I 
want to the memory and registers in the emulator and can execute things one 
at a time.  Initially it was VERY basic and everything had to be hand 
assembled into the thing, but now it works off pattern matching assembly so 
I can actually see what commands I'm really using.  Also, there could be a 
problem with your PORT 3, because if you emulate PORT 3 sufficiently 
incorrect it will cause the emulated processor to never check the keyboard, 
but if you're getting a blinking cursor, then I don't think it can really be 
that.

And also, I'm asking for some clarification here, why would you Z80 core 
deviate from TI86Emu on the keyboard handler?  The Z80 core is mearly that 
part of the program, which emulates the Z80, the wrapping subroutines define 
everything non-specific for the Z80 (such as the PORTS)  This is why there 
are a number of emulators out there that came out in a very short time, they 
borrowed a core and wrote the wrappers, meanwhile some wrote the entire core 
themselves, which made the process take 1 1/2 semesters *mumbles under 
breath*

>From: "Liyang Hu" <liyang@liyang.freeserve.co.uk>
>Reply-To: ti-emulator@lists.ticalc.org
>To: "TI-Emu ML" <ti-emulator@lists.ticalc.org>,"TI-86 Asm ML" 
><assembly-86@lists.ticalc.org>
>Subject: ti-emu: RE: A86: Re: new emulator
>Date: Tue, 21 Dec 1999 21:07:54 -0000
>
>
> > Well I don't mean to discourage, but... VTI is pretty dang good, and 
>it's
> > gonna take quite a while to get it as good as that... It's kind of like 
>TI
> > sites, what we already have is good enough.
> >
> > But anyway, the TI85/6 ROM is a great test. When I wrote my
> > emulator a while
> > ago, I found that if any Z80 opcode was misimplemented, the ROM simply
> > wouldn't work. (i.e., turn it on, push 2+2, etc).
>
>Oh well, I might as well tell you about it - I'm writing the emu for my 
>Palm
>III.
>I think I have most of the core logic bits done (On the PC, that is. It'll
>be ported over to the Palm as soon as I figure out how the keyboard works),
>but I have problems implementing the keyboard handler - I'm using TI86Emu
>(the one written in C++ builder) as my only debugging tool / reference. 
>Note
>however that I do not want a cycle-perfect emulation of the core, I want it
>to be as fast as possible. My problem is this - my Z80 core deviates from
>TI86Emu whenever I'm going through the keyboard code (although that's kinda
>expected), but the keyboard handling stuff isnt quite working. I'm not
>really sure if it's my handler code or whether I'm misimplementing some
>opcode somewhere... I was hoping for something that will test the Z80 core,
>not my keyboard handler :)
>
>nb: the emu works to the point where I have a flashing cursor sitting there
>at the home screen... if only the keyboard works...
>--
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