Saturday, August 19, 2017

CSpect V0.7 released

port $57 and $5B are now mapped as $xx57 and $xx5B
Fixed a couple of sprite flipping and rotation issues
Can now use RST $08 to save (see the layer 2 demo)
Some more additions to SNasm - see docs

Enjoy!

Download: CSpect Emulator


Wednesday, August 16, 2017

Shock! CSpect V0.6

Okay... shock... new version.
HLDE has been renamed to DEHL, and ACC32 has been renamed to A32
I've also added the new TEST $XX opcode
And I've added SAVEBIN "filename",start,len
and I've added SAVESNA "filename",PC [,STACK]
'*' as current drive now working properly

swapnib           ED 23           A bits 7-4 swap with A bits 3-0
   mul               ED 30           multiply HL*DE = HLDE (no flags set)
   add  hl,a         ED 31           Add A to HL (no flags set)
   add  de,a         ED 32           Add A to DE (no flags set)
   add  bc,a         ED 33           Add A to BC (no flags set)
   add  hl,$0000     ED 34 LO HI     Add A to HL (no flags set)
   add  de,$0000     ED 35 LO HI     Add A to DE (no flags set)
   add  bc,$0000     ED 36 LO HI     Add A to BC (no flags set)
   outinb            ED 90           out (c),(hl), hl++
   ldix              ED A4           As LDI,  but if byte==A does not copy
   ldirx             ED B4           As LDIR, but if byte==A does not copy
   lddx              ED AC           As LDD,  but if byte==A does not copy, and DE is incremented
   lddrx             ED BC           As LDDR,  but if byte==A does not copy
   fillde            ED B5           Using A fill from DE for BC bytes
   ld  hl,sp         ED 25           transfer SP to HL
   ld  acc32,hlde    ED 20           transfer HLDE into ACC32
   ld  hlde,acc32    ED 21           transfer ACC32 into HLDE
   ex  acc32,hlde    ED 22           swap ACC32 with HLDE
   inc hlde          ED 37           increment 32bit HLDE
   dec hlde          ED 38           increment 32bit HLDE
   add hlde,a        ED 39           Add A to 32bit HLDE
   add hlde,bc       ED 3A           Add BC to 32bit HLDE
   add hlde,$0000    ED 3B LO HI     Add $0000 to 32bit HLDE
   sub hlde,a        ED 3C           Subtract A from 32bit HLDE
   sub hlde,bc       ED 3D           Subtract BC from 32bit HLDE
   mirror a          ED 24           mirror the bits in A    
   mirror de         ED 26           mirror the bits in DE    
   push $0000        ED 8A LO HI     push 16bit immidiate value
   popx              ED 8B           pop value and disguard
   nextreg reg,val   ED 91 reg,val   Set a NEXT register (like doing out($243b),reg then out($253b),val )
   nextreg reg,a     ED 92 reg       Set a NEXT register using A (like doing out($243b),reg then out($253b),A )
   pixeldn           ED 93           Move down a line on the ULA screen
   pixelad           ED 94           using D,E (as Y,X) calculate the ULA screen address and store in HL
   setae             ED 95           Using the lower 3 bits of E (X coordinate), set the correct bit value in A
   test $00          ED 27           And A with $XX and set all flags. A is not affected.

Download: CSpect Emulator

Tuesday, August 15, 2017

CSpect V0.5

Will just say.... These are all subject to change. Looks like HLDE will swap to DEHL to help compilers, and ACC32 changes to A32. So be aware when using.

Okay, this this (might) be the last one for a little - I really want to carry on with my game, and not get drawn into doing emulators and assemblers all the time!


There are also several new Z80 opcodes to play with! My included assembler will assemble these correctly for use in the emulator. There are a few more to come.....

   swapnib           ED 23           A bits 7-4 swap with A bits 3-0
   mul               ED 30           multiply HL*DE = HLDE (no flags set)
   add  hl,a         ED 31           Add A to HL (no flags set)
   add  de,a         ED 32           Add A to DE (no flags set)
   add  bc,a         ED 33           Add A to BC (no flags set)
   add  hl,$0000     ED 34 LO HI     Add A to HL (no flags set)
   add  de,$0000     ED 35 LO HI     Add A to DE (no flags set)
   add  bc,$0000     ED 36 LO HI     Add A to BC (no flags set)
   outinb            ED 90           out (c),(hl), hl++
   ldix              ED A4           As LDI,  but if byte==A does not copy
   ldirx             ED B4           As LDIR, but if byte==A does not copy
   lddx              ED AC           As LDD,  but if byte==A does not copy, and DE is incremented
   lddrx             ED BC           As LDDR,  but if byte==A does not copy
   fillde            ED B5           Using A fill from DE for BC bytes
   ld  hl,sp         ED 25           transfer SP to HL
   ld  acc32,hlde    ED 20           transfer HLDE into ACC32
   ld  hlde,acc32    ED 21           transfer ACC32 into HLDE
   ex  acc32,hlde    ED 22           swap ACC32 with HLDE
   inc hlde          ED 37           increment 32bit HLDE
   dec hlde          ED 38           increment 32bit HLDE
   add hlde,a        ED 39           Add A to 32bit HLDE
   add hlde,bc       ED 3A           Add BC to 32bit HLDE
   add hlde,$0000    ED 3B LO HI     Add $0000 to 32bit HLDE
   sub hlde,a        ED 3C           Subtract A from 32bit HLDE
   sub hlde,bc       ED 3D           Subtract BC from 32bit HLDE
   mirror a          ED 24           mirror the bits in A     
   mirror de         ED 26           mirror the bits in DE     
   push $0000        ED 8A LO HI     push 16bit immidiate value
   popx              ED 8B           pop value and disguard
   nextreg reg,val   ED 91 reg,val   Set a NEXT register (like doing out($243b),reg then out($253b),val )
   nextreg reg,a     ED 92 reg       Set a NEXT register using A (like doing out($243b),reg then out($253b),A )
   pixeldn           ED 93           Move down a line on the ULA screen
   pixelad           ED 94           using D,E (as Y,X) calculate the ULA screen address and store in HL
   setae             ED 95           Using the lower 3 bits of E (X coordinate), set the correct bit value in A

Download: CSpect Emulator

Thursday, August 10, 2017

Version 0.4 of CSpect

This is a new release of my CSpect emulator with yet more ZX Spectrum Next features.

You can now set sprite and screen order priorities, and the included Layer 2 scrolling demo+source shows how to do this.
Full memory banking has been added, so you can now use the full 1MB of RAM that will come with the next! (well....subject to change, and esxDOS pinching some). Again the Layer 2 demo shows this function in the utils.asm file. The comments also show the general layout of memory, so you should take a look there before using the paging.

Layer 2 double buffering! You can now have 2 Layer 2 buffers and page in either to $0000-$3ffff using the new bit layout in port $123b - see the included read me. for more details. To flip buffers, you just need to swap register 18 and register 19 values around.

There are also several new Z80 opcodes to play with! My included assembler will assemble these correctly for use in the emulator. There are a few more to come.....

   swapnib    ED 23    A bits 7-4 swap with A bits 3-0
   mul        ED 30    multiply HL*DE = HLDE (no flags set)
   add  hl,a  ED 31    Add A to HL (no flags set)
   add  de,a  ED 32    Add A to DE (no flags set)
   add  bc,a  ED 33    Add A to BC (no flags set)
   outinb     ED 90    out (c),(hl), hl++
   ldix       ED A4    As LDI,  but if byte==A does not copy
   ldirx      ED B4    As LDIR, but if byte==A does not copy
   lddx       ED AC    As LDD,  but if byte==A does not copy, and DE is incremented
   lddrx      ED BC    As LDDR,  but if byte==A does not copy


The file system will (should) also now accept '*' or '$' as setting the current drive. (untested)

I have also started to add some basic Audio, so the spectrum beeper now works.

Lastly.... the Sprite shape register has switched from port $55 to port $5B

Download: CSpect Emulator