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Anti-piracy measures on Speccy games - What games have it?I was looking at the JSW card which gives you the grid location system for protecting the game against simple forms of copying, and I know that ATF h…
... randomise itself from the 'FRAMES' system variable - thereby giving an effectively random ... on it (probably the usual JP instruction to get around it ... -
40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…
...
; so look at the system variable PROG
dec hl ; move ... the
push af ; operating system.
call doit1 ;
pop ... is
sub 165 ;
jp po_tokens ; exit via PO_TOKENS
How do I detect if key 'H' is pressed in machine code?How do I detect that the key has been pressed? I have been using the IN 239 command for keys 6-0, but dont know how to detech 'H'...
... works if the ordinary Speccy system interrupt routine is running. ... key pressed into the 'LASTKEY' system variable.
If you ... a JP 56 instruction, which will then jump to the system ... 56, which will call the system interrupt routine first, then ...SE BasicAfter 13 years of development I thought I'd run out of things to optimize, but it turns out I was wrong. However, I'm now running out of time to work…
... of the ROM as a JP instruction.
[*]More room for ... start guide, including memory map, system variables, flags, and command summary ... during tokenization.
[*]User system variable space accessible via IY register.< ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... d ; store in subppc
jp z, stmt_loop ; consider first statement ... /> val_fet_2:
push af ; stack system variable
call scanning ; evaluate expression ... /> org 0x1cdb
class_b:
jp save_etc ; immediate jump
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... ld (coords), bc ; set system variable
call pixel_add ; ... ; write pixel byte
jp po_attr ; immediate jump
jp pr_all_f ; immediate jump
jp pr_all_f ; immediate jump
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... ; set carry flag
jp set_stk ; immediate jump
... ld (chans), hl ; set system variable
ex de, hl ; ... new return address
jp stmt_ret ; immediate jump
jp start_new ; immediate jump
...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
...
chan_s_1:
jp temps ; immediate jump
system variable
inc hl ; point to next system variable
jp pause_0 ; immediate jump
jp (hl) ; immediate jump
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... in
ld (hl), e ; system variable
ret ; end of subroutine ... a, a ; FOR-NEXT variable?
jp m, next_o_1 ; jump if so ... , report_c ; error if overflow
jp set_stk ; else immediate jump
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... /> trace:
call test_0_or_1 ; get variable
set 7, (iy + _flags2 ... :
ld hl, last_k ; address system variable
ld (hl), l ; signal ... /> org 0x392a
console_in_3:
jp key_input_1 ; immediate jump
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... ld hl, vdu_flag ; address system variable
res 5, (hl ... ; reduce counter
jp cls_3 ; immediate jump
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... ), hl ; set system variable
ret ... flags2 ; address system variable
jp z, key_mode ...FZX: a new standard format and driver for proportional fonts[B]FZX[/B] is a very compact and efficient (although extremely flexible and powerful) standard format to create new fonts for the ZX-Spectrum. It sup…
... - and Boriel's system uses IX for tracking variable space. I had ... uses IY for its own system variable tracking (A real shame that ... all ret instructions to a JP END command, and make the ...Trailblazer Cheat ModeThere's a [URL="http://www.the-tipshop.co.uk/cgi-bin/info.pl?wosid=0000657"]familiar cheat mode[/URL] in Trailblazer... It's a bit convoluted to get…
[QUOTE=jp;819926]There's a [URL=" ... - a case of changing a system variable to point to the printer ...Interupt service routinehas anyone set up a interupt service routing with pasmo? this one I tried resets the speccy EDIt- I placed the code after the END directive, I fi…
... routine so you increment FRAMES System Variable and read the keyboard (no ... /> [ rest of your ISR ]
JP MASKINT ; Jump to ROM maskable ... AF
POP HL
JP MASKINT ; Jump to ROM maskable ...Curious feature of tape loader for Pssst!Hi everyone, I have a copy of the Ultimate game Pssst! on tape, which I decided to copy to 3-inch disk so I could load onto my +3 quickly, and so …
... checking the JP (HL) instruction I loads into the NMI system variable.
JP (HL) instruction (it's only ...predetermined number of loops in assemblerhi, i have this code that i have already written org 40000 ld c,33 ld (23612),a ld a,c rst 16 inc c jp 40001 but i only want to loop i…
... much sense to me. The JP instruction is incorrect. It’ll ... also rewriting the TV FLAG system variable. Again, I'm not sure ...Character SetAlright, this may not be the right forum for this question (it does sort of relate to a game which I'm trying to get working properly - long story) -…
... ) - does anybody know where the system variable is that points to the ...what extra port for extra memory ? (256K, 512K, 1024K, etc.)I know that Pentagon uses some extra bits from port 7FFD for extra memory pging: - for 512K model, bit 6 & 7 of port 7FFD - for 1024K model, bit 5, 6…
... into account the actual BANKM system variable. By using those bits for ...Chuckie Egg EditorI suppose you could say this was MIA, in as much as nobody knew it existed. In 1985 I wrote a Chuckie Egg Editor, and apart from copying it for a fe…
... of the program changes a system variable so it crashes when you ...How to detect 48k modeHow can you detect if a 128k machine is in 48k mode (from an emulation point of view, not via BASIC or machine code)? Checking the current rom? But …
... /> Read bit 4 of the system variable FLAGS? But could this be ...Spectrum Key Codes?Hi guys, I have just been reading up about the Sinclair Keypad that was released to accompany the 128K. I read this on the a website, this was refe…
... code is stored in a System Variable named LAST_K at memory location ...Pocket Clive - 2 QuestionsHello, I've just started using Pocket Clive on my iPaq pocket PC, excellent emulator BTW. 1. I have just wrote a small BASIC program to randomly pi…
... assume this is because the system variable FRAMES is always restored on ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
...
; so look at the system variable PROG
dec hl ; move ...Poke 23739,111So, I'm looking at some of my old loaders (BASIC stuff) to work out how I got the display to not corrupt on loading code. It's the old POKE 23739,111…
... do? It's not a system variable, so what does it actually ...
