-
It's a trap!So I got a CPLD (not the eventual one I want to use for the ethernet project - rather, one I actually have here and now, an XC9536 in a PLCC44). And…
... RST8EN jumper is closed (allowing RST 8 traps to be enabled ... )" and exits, except for the RST 8 trap which does an ... point there, and do the RST 8 style trick of passing ... disassembly" especially with regards to RST 8 traps.
Oh ... -
Bizarre stuff in Interface 1's shadow ROMAccording to the Complete Shadow ROM disassembly, the function that exits back to the BASIC interpreter after interpreting IF1 commands is this: [co…
... main ROM is
05CC RST 18,CHKSYNTAX STMT-NEXT if ... />
Now look at the RST 18 routine:
[code ... what's REALLY in the RST 18 routine? The disassembly contains ... -
Understanding extensions to the BASIC parserFor a while, I've had a rather 'rinkety dink' extension to BASIC via an RST 8 trap in hardware, just so that I can send stuff to a Spectrum over ethe…
... ' extension to BASIC via an RST 8 trap in hardware, just ... need to do when intercepting RST 8 to parse your own ... -
Probing the variables in 128K modeHello again! Briefly, I'm writing an m/c routine to read some BASIC variables. So, before I start, I try to get an idea for the structure of how var…
... 19
PRINT
RST $10
ADD HL,DE ... STRINGARRAY
SUB 96
RST $10
LD A,36 ...
BRACKETS
RST $10
LD A, ... ARRAY
SUB 64
RST $10
NEXTCHAR
... /> JR NZ,LASTCHAR
RST $10
JR NEXTCHAR
Handling RST8 on a +3Well, I've come to that bit of my project that I wasn't really looking forward to (because I don't understand enough about the ZX BASIC ROM) - extend…
... by the way of handling RST 8.
So far ... tackled this thorny issue, my RST 8 handling worked fine on ... /> - How should returning from handling RST 8 be done on a ...Channels and streamsSo I've put some thought into channels and streams, and read the dead (and presumably rotting corpse) of the CSS FAQ which contains some information …
128 ROM paging alternativeWould this work (with the appropriate code in each ROM)? [code] ; 128 rom paging routine ; use rst 28h with call address stored after restart ;;rom…
... rom paging routine
; use rst 28h with call address stored ... next instruction after the original rst
; and address
[/code ...IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…
... br /> ld a,' '
rst #10
ld a,' '< ... add a,7
PrintLN rst #10
ret
...So what about ethernet and ZX BASIC?Well, as of about 5 minutes ago, ZX BASIC for the first time properly wrote some packets to the network! OK, so it isn't perhaps 100% what Andrew Ow…
... not relying at all on RST 8 traps), but the Spectranet ...Machine Code Microdrive File LoaderI've been experimenting with transferring games to run from microdrive. Typically I like to see a loading screen while things are happening, and I li…
... (hd_11),hl ; execute main2
rst $08 ; by using the if1 ...
out ($fe),a
rst $10
defw $0d6b
Implementing goto on error condition...OK, so when I'm reading a file or directory on a network filesystem, when I reach EOF, it's not actually useful at all for ZX BASIC to stop the progr…
... 8 (error code 7) when RST 8 fires, then set NEWPPC ...Midi Out from machine codeI need to send midi-signals by machine code, while Basic is too slow for my current project. I already read I can use hookcode #11E, but I have some …
... , before calling this hookcode with RST #11E.
I am using ...
OUT #1FFD, 0
RST #11E
OUT #1FFD, (23399 ... have the Midi-data when RST #11E is called.
Building a menu in ASMWEll as probably some figured, i am learning asm at least to make the basic menu i did in basic. It is a menu where we can select games to be loaded.…
... print because i used the RST $10 instead because the GDUs ...A tidy loader for minigamesThe minigame competition doesn't permit the use of separate loaders like [code]10 LOAD "": RAND USR 32768[/code] The loader must be included in the b…
The minigame competition doesn't permit the use of separate loaders like
[code]10 LOAD "": RAND USR 32768[/code]
The loader must be included in the byte count.
In an attempt to save as many bytes as possible, people have written ...Machine code sub routinesHi everyone, I have noticed that in machine code you can call different "preset" routines like rst 16 or something, or call 6533... where can i fi…
... call different "preset" routines like rst 16 or something, or call ...Print text in assemblyHello, a perhaps simple question: I would like to print a text string on the screen and I wonder how to do that in the most easy way? I seem to re…
... kind of ROM based code, RST 16 (?), but can that print ...Optimization for this codeHello, I have done and submitted a small program for the CSS Crap Game Compo which involves a machine code routine. The z80 with BASIC and MC is av…
Printer Printing Problem (assembler)I've a program that outputs to the lower screen at various places, using a combination of calls to RST $10 plus OUT-NUM-1 and PR-STRING. It also call…
... a combination of calls to RST $10 plus OUT-NUM-1 ...Assembler intricaciesHi all, I've been looking at the internals of a game to see how it all works and I've found some things that I don't understand and can't find any i…
... I don't understand is RST 48 (48 is decimal, so ...CPCDiskXP v2.1 Added support (Open/Create Dsk's, add/delete/rename files) for +3DOSCPCDiskXP v2.1 Changelog (since v2.0): [LIST] [*]DSKEditor - Added full support (Open/Create Dsk's, add/delete/rename files) for the following format…
... loaded on computers. Reported by RST.
[*]FLOPPY to DSK ...quick - Zx80 ASM questionWhile I am ploughing through lots of ASM listings, one of my earlier adaptation attempts surprised me [B][asm code][/B] [code] org 32768 start: ld…
... done if it is
rst 16 ; spectrum: print the character ...(part of) screen to UDGHere is a routine to copy a Y,X-position on screen to a UDG. 0<=y<=23 0<=x<=31 144<=udg<=165 (UDG "A" to UDG "U") [code] ; start code with ; PRINT …
Here is a routine to copy a Y,X-position on screen to a UDG.
0
