-
Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…
... ,65533
ld a,7 ; AY Mixer Control - I/O Enable ... ,65533
ld a,14 ; AY I/O
out (c ... /> @@send: mov dx,3fdh ; Status Register
in al,dx
Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…
... ,65533
ld a,7 ; AY Mixer Control - I/O Enable ... ,65533
ld a,14 ; AY I/O
out (c ... /> @@send: mov dx,3fdh ; Status Register
in al,dx
Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…
... -CONTENDED RAM*
; *CORRUPTS REGISTER 7 OF AY-3-8912*
ld a,7 ; AY Mixer Control - I/O Enable ... ,65533
ld a,14 ; AY I/O
out (c ...Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…
... -CONTENDED RAM*
; *CORRUPTS REGISTER 7 OF AY-3-8912*
; *MUST ...Rotating Register PairsWhat's the best way to rotate left (or right) a register pair, so that (eg.) FE76 becomes E76F (or 6FE7)? I presume that passing the intermediate bit…
... rotate a WORD (16 BITS) one nibble (4 BITS) to the left ... location (hl) and the 'a' register (accumulator): RLD and RRD
register to another. Make sure the ...Rotating Register PairsWhat's the best way to rotate left (or right) a register pair, so that (eg.) FE76 becomes E76F (or 6FE7)? I presume that passing the intermediate bit…
... in a register pair and mask the 4 LH-bits to ... get the value, but the LH-number needs a register ... pair rotated left 4 bits to store ... it and then right four bits to retrieve it.
... 's LH or RH register pair rotation four times ...Rotating Register PairsWhat's the best way to rotate left (or right) a register pair, so that (eg.) FE76 becomes E76F (or 6FE7)? I presume that passing the intermediate bit…
... a register pair and mask the 4 LH-bits to ... get the value, but the LH-number needs a register ... pair rotated left 4 bits to store ... 's LH or RH register pair rotation four times ... ). Works for 12 bits, for 24 bits you must built some ...Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…
... were not used. The IX register was used as a return ... function to send the Z80 register state to the PC. I ... -CONTENDED RAM*
; *CORRUPTS REGISTER 7 OF AY-3-8912*
; *MUST ...Rotating Register PairsWhat's the best way to rotate left (or right) a register pair, so that (eg.) FE76 becomes E76F (or 6FE7)? I presume that passing the intermediate bit…
... left-right, so that the bits are all in descending order ... visualise the numbers and which register each part should go in ...Assembly Programming for IDIOTSOk are there any websites guides for what opcodes do in a z80 or books... but for really really thick people like me :-) Something along the lines …
... ISR reads the interrupt status register). This is, for example, ...
Besides, an interrupt control register for each device is very ... it allows the programmer to select which devices are expected ... probe for the interrupt status register of every device in ...Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... = Move zero extended (Clears upper bits of register)
REP STOSD = Store ...Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... architecture (32 address/32 data bits)
* No variable ... every instruction exactly 32 bits wide to simplify instruction ... operations will be strictly register to register only, all ALU ... * Program counter is just another register (r31)
* Conditional ...Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... out with a low register count (it was still ... as my code was register inefficient but I eventually started ... addressing modes such as; destination register equals (address + register1) + (register2 ... split loading 32 BITS into a register over two instructions. ...designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…
... accumulator with a register
0010 SUB - Subtracts register from accumulator ... />
The first four bits is the first instruction and ... the second four bits is the other instruction. ... address for memory is 8 bits, the operations are all ...Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... addressing modes such as; destination register equals (address + register1) + (register2 ... to split loading 32 BITS into a register over two instructions. ... immediate of more than 16 bits though (some research, IIRC, ... like no more than 13 bits). In any case, a ...designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…
... as it can fetch 8 BITS (1 BYTE) from memory ... as it can fetch 8 BITS and has 32 BIT ... (increment). To clear a register you subtract or XOR it ... be loaded into the A register in four instructions taking just ... got solved with the modulo register (MR). I've had ...Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... addressing modes such as; destination register equals (address + register1) + (register2 * x ... to split loading 32 BITS into a register over two instructions. It ...Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... be coded using a low register count.
[/quote]
... them all greater than 32 bits long, and therefore requiring ... as if it were a register file. (IIRC zero page ... an immediate 8 bit register load on a Z80, ... load of a 6502 register took 2 cycles, and ...Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... you are a 'many' register man, the opposite of ... me being a 'few' register man. Everyone has their ... bus was set at 64 BITS around 1993.
BITS * 4 = 32 BYTES ... processed in parallel with normal register based instructions.
designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…
... 1101 SAV - Save value of register into memory
1110 LOD ... - Load value from memory to register
[/QUOTE]
... a memory location and a register to use, if you ... value contained in a register and use that as ... with registers only being 4 bits.)designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…
... !
The first four bits specify the register to use and the ... second four bits specify the address ...designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…
... !
The first four bits specify the register to use and the ... second four bits specify the address ...Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…
... to use structures using index register IX as I feel strongly ... frame
and a,00000111b ; Select sprite X pixel frame 0 ... /> rrca ;
rrca ; / 8 to select character
rrca ;
ld ...Playing SID music on AY??Hello. Some time ago, with occasion of another thread, I was asking about possibility of making a very certain thing - a SID emulator for Spectrum …
... />
Translating SID data to AY is different question. Do you ... translation 'offline', through dumping SID register writes from C64, and translating ... by custom PC tool to AY dump. I could say right ... which has more features than AY in some areas, though with ...Playing SID music on AY??Hello. Some time ago, with occasion of another thread, I was asking about possibility of making a very certain thing - a SID emulator for Spectrum …
Maybe with a fast enough CPU one could "emulate" the SID itself sampling it to the X bits you can achieve using the 3 AY channels playing samples in real time. This is, a soft-synth.Bell sound with PLAY command?Hi Folks, I am no musician so I was hoping someone could give me a PLAY command that would sound like a bell on the Spectrum. A bell that sounds li…
This Usenet posting:
[url]http://groups.google.co.uk/group/alt.folklore.computers/msg/ef8e91ce4537b608?hl=en[/url]
gives register values for "a repeating pseudo-'bell' tone". You could send them to the AY with OUT commands.Bell sound with PLAY command?Hi Folks, I am no musician so I was hoping someone could give me a PLAY command that would sound like a bell on the Spectrum. A bell that sounds li…
... =en[/url]
gives register values for "a repeating pseudo ... could send them to the AY with OUT commands.[/QUOTE]
Bell sound with PLAY command?Hi Folks, I am no musician so I was hoping someone could give me a PLAY command that would sound like a bell on the Spectrum. A bell that sounds li…
... 14 values to the 14 register the AY chip has. Altering such ...How do you have your speccy stuff organised on the PC?I'm curious as to how the good folks in here have their PC speccy stuff organised. For instance, do you have a single Programs folder with all your…
... /> [code]
\Apps
\Apps\AY Emulator
\Apps\BasicTurboTape
\ASM Projects\UVMeter
\Bits
\Books
\CF01 - copy ...Playing SID music on AY??Hello. Some time ago, with occasion of another thread, I was asking about possibility of making a very certain thing - a SID emulator for Spectrum …
... of player code, dumping the register output in RAM with some ... . In any case, 128K with AY is a must.
