... ] is the entry point with register set up as indicated. It ... (hl) at line 177 after register set up. The jp(hl ... struct_sp1_ss where information on horizontal shift and animation frame is gathered ...

... (S)hift - Rotate carries in, shift doesn't
(L)eft ... )rithmetic or (L)ogical for shift / (C)ircular, (D)ecimal or ... ) so don't have a register argument.

SLL is ...

... routines use "undocumented" instruction SLIA (Shift Left Inverted Arithmetic), sometimes also ... denoted as SLL (Shift Left Logical). SLIA shifts register left and sets ...

... . So we need an extra register 'on the left side' (which ... /> ;-------
div1 ADD HL,HL ;shift dividend 1 to left,
shift a valid bit into oblivion ...

... -True Video
SS-Symbol Shift PGDN-Inv Video
CS ... -Caps Shift UP-up arrow
EX ... - change playing mode:
.linear, not looped
.linear, looped
.one ...

You can get an arithmetic left shift on the HL register pair by using the ADD HL, HL instruction. Sadly, there's no equivalent for a right shift.

... get an arithmetic left shift on the HL register pair by using ... no equivalent for a right shift.[/QUOTE]

Well, there ...

... * learning Z80 and asking for feedback before jumping in and implementing ... still dropping in references to register 'a' - or do you really ... mean that the register 'A' (addressed as 1010) is ...

... is exactly the sort of feedback I was looking for!
SHIFT + SPACE works.
[/quote]
SHIFT act as caps shift and RIGHT SHIFT as symbol shift. Both ... keys also work as symbol shift. For consistency, I'll make ...

... 'add hl,hl' will shift a 16 BIT value one ... add hl,hl' as a 'shift' rather than 'rotate' because ... (hl) and the 'a' register (accumulator): RLD and RRD
register to another. Make sure ... the 8080/Z80 rotate and shift instructions:

[ ...

... just put it in a register pair and mask the 4 ... the LH-number needs a register pair rotated left 4 bits ... Metalbrain's LH or RH register pair rotation four times seems ... for the Z80; all the shift and rotate commands just work ...

... just put it in a register pair and mask the 4 ... the LH-number needs a register pair rotated left 4 bits ... Metalbrain's LH or RH register pair rotation four times seems ... for the Z80; all the shift and rotate commands just work ...

... to use structures using index register IX as I feel strongly ... /> ; 254 V C X Z SHIFT
; 253 G F D ...

... if expanded)
Whereas with linear frame buffer you need someting ... ) you [B]waste a whole register pair[/B] to hold a ...

... =TVzombie;503402]Whereas with linear frame buffer you need ... the linear buffer. And this is the worst register- ... , with a free register that will be reloaded ... , and with that register we could something along ... And wasting a whole register to hold a constant ...

... advantage goes clearly to the linear buffer.[/QUOTE]
Not so ... said loop, and with that register we could something along the ... special cases, and with simple linear framebuffer you can't take ... be much simpler with a linear buffer.[/QUOTE]
Not so ...

... ;509682]I did try a register rotate program as it seemed ... +6+6 characters of pre-shift data compared to 4+4 ... /> [LIST]
[*]Don't pre-shift your sprites but compress them ... to decompress the sprites and shift them via rotation or tables ...

... per frame using in-line register shifting without flicker then?[/QUOTE ... .
1) shift in registers
2) shift in memory
3) shift by table
shift table. for combined operations (shift+mirror) it is ...

... be addressed using the index register IY because the range of ... universal routine for any vertical shift)
(aligned and/or expanded ...

... hold in a 8-bit register, so for coordinate storage, a ... fixed-size blocks. Even the linear frame buffer is better in ...

... assembled to 32768, the PC register hits for once - end of ... beepolas editor works) rather than linear (all the rows stored once ...

... This is because indexed register instructions require a prefix ... order to catch one shift with one key. If ... do is probably to register no keypress. The way ... the result (you will register the last key read ... suggest that caps+sym shift should be tested outside ...

... ]Thanks very much for the feedback, ewgf![/QUOTE]

Thanks ... the engineering problems before his shift ends, or he's fired ...

... the engineering problems before his shift ends, or he's fired ... I do listen to user feedback. I do believe it is ...

... the mcleod_ideafix latest findings about register contents at cold-start/warm ... cross-assembled code).

SHIFT+6 does not produce the ...

Thanks for your feedback guys.

[QUOTE=roko; ... returns the SP0256's status register.
- Writing to memory at ... in could execute the status register![/QUOTE]

This is ...

[QUOTE]
Would I be right in assuming that your HALT emulation simply increments T_states by 4 and leaves PC untouched?
[/QUOTE]
Yes, that's exactly what it does. Let's get to port reading and keyboard handling. Here's port reading (all IN ...

... was expecting.

Any feedback/suggestion (polite ;)) from you MCODE ... is to use a single register starting at 0. As well ... as saving a register, the decrement is faster and ...

... .
DEC ss Decrement register pair ss.
DI ... ).
INC r Increment register r.
INC ss ... LD r,r' Load register r with register r'.
LD SP ... b of register r.
SLA m Shift operand m ...

... ;570779]Excellent ! Thanks for the feedback. Out of interest, for information ... fact that if you would shift the signal output by few ...