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Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…
... of the screen, a 'contention pattern' is in effect. This is ... (#FE),A / OUT (C),A, with A being typically #00, #10 and so on in ... OUT. Therefore if the OUTs in a beeper sound loop are timed ... -cyclic contention pattern. A single OUT in the beginning might trigger ... -
Technician Ted disassemblyOkay, by popular (?) demand I have dug out my old disassembly notes on Tech Ted, converted them to skoolkit and stuck them up at [url="https://github…
... routines documented. "Down In The Sewerage" is not a default room; all ... />
As for putting these in the archives, yes the more ... For instance, you can define FE and FF as special commands ... faster than doing compares. Or, in a similar manner, test for bit ... -
50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
...
xor a ;
ld a,5 ;
out ($fe),a ; border change
A
in a,($ff) ; [11]read ... port 0x40FF into A
cp d ; [ ... ;
;
ld a,7 ;
out ($fe),a ; border change
ld ... -
Easiest way to figure instruction lengthGiven a start address, what is the easiest way to find out instruction length at that address in Z80? I found [url="http://www.z80.info/decoding.htm"…
... check
LD C,&FE ; C is always FEh ... to list of keys
IN A,(C) ; Read the row ...
LD C,&FE ; C is always FEh ...
LD C,&FE ; C is always FEh ... -
Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... /> ld l, a
; remember C in A
ld a, c
.nexthalfline
in a, (c) ; read keyboard ... pressingsymbolshift
ld a, 64 ; set bit 6 in A
; forget ... pressingcapsshift
ld a, 128 ; set bit 7 in A
; forget ... -
Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... /> ld l, a
; remember C in A
ld a, c
.nexthalfline
in a, (c) ; read keyboard ... pressingsymbolshift
ld a, 64 ; set bit 6 in A
; forget ... pressingcapsshift
ld a, 128 ; set bit 7 in A
; forget ... -
Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... /> ld l, a
; remember C in A
ld a, c
... L
db #C6, #EE, #FE, #D6, #D6, #C6, #C6, ... #C6, #C6, #D6, #D6, #FE, #EE, #C6, #00 ; W< ... , #60, #FC, #60, #60, #FE, #00 ; £
db #00, # ... /> db #00, #00, #EC, #FE, #D6, #D6, #C6, #00 ... -
Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... a ' in a character literal, e.g. '\''
; \" #22 allow to enter a " in a ... ; "
db #6C, #6C, #FE, #6C, #FE, #6C, #6C, #00 ; #
... )
db #00, #6C, #38, #FE, #38, #6C, #00, #00 ; *< ... 66, #60, #FC, #60, #60, #FE, #00 ; £
db #00, # ...
