... 16K ROM. :)

Seriously, the Spectrum wasn't designed to deal ... with things like sprites, vector graphics or ...

... usual way is to set up your own im2 interrupt routine that ... replaces the one in ROM to take ... care of the song. So, yes, the ROM routine ... is totally useless but the custom IM2 one you ...

... One of the most difficult-to-crack protection systems I ... the ROM. And the Break vector would be changed to point to ... CRC check was performed to test the decode against ... 'd have to add "(c) Kevin Edwards" to the above ... 't Firebird do that to begin with?)
2 ...

... they stick the game in IM2, which allows a programmer ... to run in RAM. So instead of running the ROM ... only thing you need to worry about. FRAMES might ... counting on reading it to measure time passed. If ... you can do without the ROM interrupt.

[ ...

... by replacing calls to zx_cyx2saddr() with calls to zx_cyx2saddr_callee() where ... need to use "ld b,16" to get it to run ... ()
{

// initialize im2 mode

#asm
vector table at address 0xd000 ...

... br /> //////////////////////////////////////////////////
/// PRINTING TEXT DIRECTLY TO SCREEN AND-OR BUFFER
to screen
temp += 256; ... to scroll, scroll it
asm("call\t56"); // call ROM ...

... has an im2 interrupt library that allows us to register functions to run ... will be registered with the im2 library for execution during the ...
seed_isr() is going to add one to the seed value while ... installed on the same interrupt vector and will be run one ...

... don't pay attention to M1 then interrupt acknowledges ... strange things to your I/O devices (especially in IM2, since ... IM 2 and send a vector).

If ... devices the best thing to use is IORQ+M1 ... fewer enable pin dedicated to control signals for the ...

... , I have z88dk generating ROM-friendly code. All locals ... 's no problems to use the ROM to run the actual ... code, I just have to ... of buffers to store rotation tables and IM2 vectors, so ... challenge. I want to manage to create a game in ...

... 5Kb of buffers to store rotation tables and IM2 vectors, so ... /> The rotation and IM2 tables can be in ROM too -- the rotation ... the rotation table in ROM, sp_Initialize() will try to 'create' the ... .

... going to have to do some work today will ...

... calling the ROM ISR and I can return to BASIC ... CLEARed the BASIC area to below the area where ... the 257 byte interrupt vector table and music data ... br /> Next I am going to check the AY music routine ... 2 handler, and returning to BASIC are working fine now ...

... one in the 128 Editor ROM, it's horribly complicated ... music playing. I need to return to BASIC after setting the ... manipulating the screen), returns to BASIC correctly whilst still running ... br /> Returning to BASIC after setting up the IM2 interrupt handler ...

... real Amiga mouse is connect to CANON9,
mouse FIRE ... +RIGHT+MIDDLE mouse buttons = enter to EXTRA MODE

... br />


IM2 fixed vector table adress (correct floating bus ... to data bus correct 8bit low adress (#FF) of
vector ...

... $1230 (point after ZX ROM sets IM 1) and then ... through some code only to return to IM 0. Is this ... the ZX ROM.

I was beginning to think that ... 16K game (highly unlikely to use IM2). Arcadia worked fine. However ... HL', IY and uses IM2 which isn't exactly ...

... use the ROM at all. Once it's in IM2 it won ... try and [I]write[/I] to the ROM though - I use it ... debugger)

Is the ROM call the reason for the ...

... =Jimmy;276954]
Is the ROM call the reason for the ... paging operation, and inside the IM2 routine too IIRC.

Perhaps that is something to do with the crash?

... the usual 128K basic editor to use another bank. Both banks ... . The IM2 routine also jumps into the ROM interrupt service routine to allow ... editing of the BASIC program whilst my IM2 routine ...

... instruction on the data bus to be executed which is ... bit computers), however, so failing to emulate it (and providing a ... IM2, the interrupting peripheral supplies the low order byte for the vector ... /> [quote]
BTW, you state to check for an interrupt every ...

... know about the one in ROM!



Winston ... ..) also? And are you planning to support blocking and unblocking modes ... some form of threading via IM2 interrupts?)

Fantastic job ...

... $FF bytes as an interrupt vector table, in IM 2 mode ... the standard ROM contains DI ($F3), it effectively jumps to $FFF4, where ... you can put a JP to the real interrupt handler.

... $FF bytes as an interrupt vector table, in IM 2 mode ... the standard ROM contains DI ($F3), it effectively jumps to $FFF4, where ... you can put a JP to the real interrupt handler.[/quote ...

[QUOTE=polomint;305927]Yeah the IM2 interrupt trick I remember using ... the same place in the ROM that was changed for 128k ... ]

Yup - always best to roll your own...

... the big gap in the ROM is that it was ... unfinished. It was supposed to include support for RS232 and ... finished. I refer you to my article on Sinclair BASIC ... only two bytes for each vector as the full 257 ... that, so it was supposed to be for microdrive support too ...

... details about setting up IM2 mode than the splib2 ... address and how to create an IM2 table using memset().< ... to reverse-engineer splib2 to know what to copy accross pages to ... () {

// Copies vector table (61440 - 61696)
// Copies ...

... memory connection detect ZX rom type ( ROM 0 / ROM 1 ) in low ... /> RESET+SHIFT - start to USR 0 mode (48 rom with 128kB memory ... EXTEND MODE - start to 48 mode (48 rom with 48kB memory)< ... tape support
- new IM2 table (+ fixed im2)
- removed logo and ...

... in the Sea Change ROM (as you note). ... use an IM2 routine and non-ROM channels to achieve the ... same thing by piping to ... the default channels. The main problem is that the ROM ... built-in expression evaluator to turn it into ...

... to $3A. On the 48K machines that area of ROM ... This means the machine wants to jump to $0000 (ie: reset) ... fix here seems to be to change I to $3B, as ... ecrypted format, and appears to decrypt itself after loading ... br /> LD I,A
IM2[/CODE]

ie: ...

... is to load a copy of the original 48k rom in ... ram mode, (or the SE rom).

I'll ... and load the original 48k rom at 0000.

... I'll have to test it first.

rom with all correct vector adress. (without ...

... 've coded this to add a @DEEK function to Spectrum with IF1 ... )
stackbc equ 2D2Bh ;16K ROM, stacks BC onto calculator
let equ 2AFFh ;16K ROM, 'LET' statement handling routine
cheat equ 1731h ;16K ROM code that does C

... the IF1 programmers did not vector the expression evaluation subroutine, ... if you want to stick to using standard ROM routines, and basically ... play safe. You have to ... be written. The 16K ROM code does all the ...