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BRAND NEW VTX 5000 MODEMSI have for disposal a number of BRAND NEW BOXED PRISM VTX 5000 Modems If tou would like to add one or more VTX 5000 modems to your Sinclair ZX Colle…
... program
Error Detection: Data is transferred in 256 Byte blocks.
EXOR ... turn sends back a status byte either
re-transmit or ... -
Converting UDG to 2x2I've got a udg that I want to display in different sizes. Obviously I just print it for normal size, I can use the udg in bin format to display it ea…
... doesn't need a 1024-byte data table after all, a 512 ... -byte one will do - although it ... also tried it with a 256-byte table, but the 4th column lost ... a d$(128,4,2) table, so I could avoid doing ... -
Optimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…
... on having the exo_mapbasebits table on a 256 byte page boundary... I use ... allow you to place the table anywhere in memory, but am ... -
Optimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…
... :
so an extra 565 byte space have to be reserved ... ]
Yes. The table must be 256 byte-aligned. HL and DE ... -
Fastest redraw of screen from UDGsHere's a question for everyone, to generate a bit of code to be used in games: On a standard 48K Spectrum, what's the fastest way to redraw the scre…
... either need a look-up table to find the start of ... fit 10 characters into a 256 byte page instead of only 9 ... -
Fastest redraw of screen from UDGsHere's a question for everyone, to generate a bit of code to be used in games: On a standard 48K Spectrum, what's the fastest way to redraw the scre…
... either need a look-up table to find the start of ... fit 10 characters into a 256 byte page instead of only 9 ... UDG character at least one byte should be zero, or at ... be able to save 1 byte and at least 2 T ... -
Relocation with SDCCI desperately need auto- relocation with SDCC. Something that will compile all of my code using start address 0 and generate relocation table so that…
... the size of the relocation table (see [url]http://u6c87.blogspot ... be fixed up to a 256-byte boundary.
Note that ... table (if eh_reloc_len != 0), followed by the code itself. The 49-byte ... -
Movin And A Groovin Horizontal Flip improvementOn the left is the flip horizontal portion from Andy Pennell'S excellent Movin' & a Groovin' machine code screen routines from Your Spectrum #19 (Oct…
... , then using a lookup table method as follows, but ... z80 fast using a lookup table.
Scr_add ...
Create lookup table to 256 byte boundary (requires 256 bytes of free space ...
;17 bytes
256 byte table will look like this:
display file addressing; screen slicingWhile working on this Compendium I'm updating or rewriting a lot of stuff. One thing I eventually came to appreciate was the simple & clever way in w…
... table will have 128 entries so will fit in a 256 byte page ... read a two-byte screen address out of the table.
256 byte page.
If you ... the high bytes in one 256-byte page and the low bytes ...Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…
Actually I made some error in the copy routine that ... times as there are 16 256 byte pages in 4 kB
Border Tron vector tableI've been trying to use the Border Tron border creator, but the vector table is created where code to my game is at (FE00 I think), how would I go ab…
... of the table, a multiple of 256, and divided by 256 to ... get the most significant byte.
The table ... itself contains all the same byte, ... to address x*256+x on interrupt. The table contents you ...Multiply by 48Is there a 'cheat' to multiply by 48 in Z80? I have a table of sprites 48 bytes each entry, and I want to be able to offset my pointer with a simpl…
... put the sprites at 256 byte boundaries and just add the ... address in the hi-byte of the address pointer ... clarify is that the table will hold 4 frames ... counter cannot jump in 48 byte segments. (good idea ... br />
Having a table of pointers to your sprites ...Optimal shifting for set pixel?Hi, I'm optimizing my set pixel code. For speed. But without using partitioned memory (i.e. a table on 256 byte boundary) I have optimal memory addr…
... be made (if placing shift table on 256-byte boundary) by using JP ...So shooting 360 degrees?...[I]How do I go about having - for example - a cannon in the middle of the screen, that can shoot in any direction towards the player?[/I] Well, I do…
... br /> You then have a table of 16-bit increments in ... arrange to shift the table values left one or ... like 128 angles (thus a 256 byte table).
So ... dY values from the table, extend them or shift ... enemy, you need another table, for ARCTAN (the opposite ...Porting Blues Brothers CPC->ZX...just an ideaI've just watched a video of the CPC version of the Blues Brothers games by Titus [url]http://www.youtube.com/watch?v=6DOj-Ta3Ek4...Based[/url] on th…
... compression obv... Would need another byte or two for each tile ... do, although just an extra byte per tile can give 8 ... go with more than one byte per tile - that's a ... . I'd keep a separate 256 byte table that holds properties for each ...Porting Blues Brothers CPC->ZX...just an ideaI've just watched a video of the CPC version of the Blues Brothers games by Titus [url]http://www.youtube.com/watch?v=6DOj-Ta3Ek4...Based[/url] on th…
... go with more than one byte per tile - that's a ... . I'd keep a separate 256 byte table that holds properties for each ...Porting Blues Brothers CPC->ZX...just an ideaI've just watched a video of the CPC version of the Blues Brothers games by Titus [url]http://www.youtube.com/watch?v=6DOj-Ta3Ek4...Based[/url] on th…
... consists of :
[byte]
[00..31] - Pixel data ... next
you can use 256 byte table for tile description
and ... another table for action bits - 8 ... element
and morfing table - for some backround action.Porting Blues Brothers CPC->ZX...just an ideaI've just watched a video of the CPC version of the Blues Brothers games by Titus [url]http://www.youtube.com/watch?v=6DOj-Ta3Ek4...Based[/url] on th…
... next
you can use 256 byte table for tile description
... element
and morfing table - for some backround action ... br /> [QUOTE]you can use 256 byte table for tile description[/QUOTE]
and morfing table - for some backround action ...SpritesYes yes, I know this has been hashed over plenty of times before, but... I have knocked up a quick tiling routine which works with my back buffer co…
... right (don't forget the 256 byte table)
I found during ... the player to a 3 byte buffer
copy the ... ) and on a couple of 256 byte tables for detection methods - thus ...SpritesYes yes, I know this has been hashed over plenty of times before, but... I have knocked up a quick tiling routine which works with my back buffer co…
... right (don't forget the 256 byte table)
I found during ... the player to a 3 byte buffer
copy the ... ) and on a couple of 256 byte tables for detection methods - thus ...SpritesYes yes, I know this has been hashed over plenty of times before, but... I have knocked up a quick tiling routine which works with my back buffer co…
... of putting the mirrroring table on a 256-byte page boundary, so you ... set the upper byte of a ... to point to the table, put your data byte in the lower ...SpritesYes yes, I know this has been hashed over plenty of times before, but... I have knocked up a quick tiling routine which works with my back buffer co…
... if I'm understanding the 256 byte table thing right, you could probably ... a game uses a mirror table, and it's location, just ...IX+n and self modifying code and pasmoI'm using pasmo and if I wanted to use ix+n like this: (ix holds the position to a sinus table) ld (symbol), a LD a, (ix+symbol) What I want to do…
... your table starts on a page boundary (a multiple of 256, ie ... $xx00) you can use:
[code]LD HL,table ...
LD A,(HL) ; Fetch byte from table[/code]
This ... index into table
LD A,(HL) ; Fetch byte from table[/code]
IX+n and self modifying code and pasmoI'm using pasmo and if I wanted to use ix+n like this: (ix holds the position to a sinus table) ld (symbol), a LD a, (ix+symbol) What I want to do…
... byte from table[/code][/QUOTE]
Better:
[code]LD H,table/256 ... ; Point to table at $xx??
LD ... into table, HL=$xxaa
LD A,(HL) ; Fetch byte from table[/code ...Mirror tableCan anyone help with a byte mirror table? e.g. so you can look up a byte of a left-facing sprite and return the correct right-facing value. There …
The table is typically aligned to a 256 byte boundary. Here, ... if let's say you have the high byte ... of the table address in B ... need to reverse the byte order, therefore step ... /> As for the mirror table, you can generate one ...Fixed point math lib?Is there a liberally licensed fixed point math lib for z80 somewhere? When searching, I expected to find a bunch of GPL'd ones and perhaps one or two…
... course the table of squares has to be on a 256 byte boundary ...Let's copy buffers!Figured I'd do some double buffered graphics, so I can render for several frames before displaying stuff. Yes, I mean on a 48k speccy, so no 128k spe…
... table (IMPORTANT: entire table must be located within 256-byte boundary,
; and last byte ... from this table ... screen address from lookup table
next:< ...I'm writing an Operating SystemOkay this might seem like a bait thread, but I am legitamately interested in figuring out how to write a multi-process system for the ZX Spectrum (no…
... (such as: JP HL or 256-byte aligned tables...)
1. Compile ... to relocate. Create a relocation table from offsets them.
... and then walk through relocation table adding the actual start ... 101h? Because this affects 2 byte address. If you compiled ...I'm writing an Operating SystemOkay this might seem like a bait thread, but I am legitamately interested in figuring out how to write a multi-process system for the ZX Spectrum (no…
... (such as: JP HL or 256-byte aligned tables...)[/quote]
< ... binaries to generate the reloc table. Because the same object ... I can only relocate on 256-byte boundaries.
I ... byte is checked) for two reasons:
1. The relocation table ...
