Search found 96 matches
- Mon Aug 26, 2019 9:34 pm
- Forum: BASIC programming
- Topic: Basic TAP file format
- Replies: 4
- Views: 6642
Re: Basic TAP file format
Hi, Basic: 10 REM LIGNE 10 20 PRINT "TEST" Tokenized lines: +-----+----> Address for next line ($0510) | | +----+----> Line number (10) | | | | +----> Token for REM | | | | | +------------------------+----> LIGNE 10 | | | | | | | +----> End Of Line 00000501 10 05 0a 00 9d 20 4c 49 47 4e 45...
- Sun May 12, 2019 10:19 am
- Forum: Emulators
- Topic: Oricutron and illegal opcode 80
- Replies: 35
- Views: 28742
Re: Oricutron and illegal opcode 80
I opened an issue about it some time ago and I solved the problem, but never sent the Pull RequestSteve M wrote:Something I noticed was if you load a disk you can't then load a tape.
- Fri May 10, 2019 5:46 pm
- Forum: Emulators
- Topic: Oricutron and illegal opcode 80
- Replies: 35
- Views: 28742
Re: Oricutron and illegal opcode 80
@Symoon: since there is no new binary release in the Github repository, you have to download the sources and compile on your PC.
An other possibility is to download the developer builds from iss's web site here
I can make the binary but only for Linux targets.
An other possibility is to download the developer builds from iss's web site here
I can make the binary but only for Linux targets.
- Fri May 10, 2019 9:10 am
- Forum: Emulators
- Topic: Oricutron and illegal opcode 80
- Replies: 35
- Views: 28742
Re: Oricutron and illegal opcode 80
Pull request and merge done
- Wed May 08, 2019 4:56 pm
- Forum: Emulators
- Topic: Oricutron and illegal opcode 80
- Replies: 35
- Views: 28742
Re: Oricutron and illegal opcode 80
I tried with a quick fix of Oricutron for opcode $80 and the loading of the screen is correct (no more shift).
I think other illegal opcodes ($xC) are not handled properly, these are also NOP opcodes but 3 bytes long.
I think other illegal opcodes ($xC) are not handled properly, these are also NOP opcodes but 3 bytes long.
- Wed May 08, 2019 4:08 pm
- Forum: Emulators
- Topic: Oricutron and illegal opcode 80
- Replies: 35
- Views: 28742
Re: Oricutron and illegal opcode 80
Here is a wiki page with some links: http://visual6502.org/wiki/index.php?ti ... ed_Opcodes
And this one explains how all illegal opcodes are handled by the CPU: https://www.pagetable.com/?p=39
And this one explains how all illegal opcodes are handled by the CPU: https://www.pagetable.com/?p=39
- Wed May 08, 2019 12:42 pm
- Forum: Emulators
- Topic: Oricutron and illegal opcode 80
- Replies: 35
- Views: 28742
Re: Oricutron and illegal opcode 80
Opcode $80 is a NOP immediate and use 2 bytes, so the next instruction is $06BF RRA ($06,X) . Oricutron display the right code and mnemonics but the emulation is wrong because it does not skip the byte $8D (immediate argument). I think 6502.c lacks a READ_IMM; line 1951 right before the break; RRA :...
- Sat Jan 05, 2019 2:02 pm
- Forum: Tape and floppy disk converters
- Topic: Track reading (Sedoric / FDC)
- Replies: 62
- Views: 69689
Re: Track reading (Sedoric / FDC)
Unlike Sedoric, there is no information stored on the disk because FTDOS does not permit to adjust the disk geometry.
So the format is always: 2 sides x 41 tracks x 17 sectors x 256 bytes. (with Jasmin 2)
So the format is always: 2 sides x 41 tracks x 17 sectors x 256 bytes. (with Jasmin 2)
- Wed Nov 28, 2018 5:29 am
- Forum: Emulators
- Topic: Oricutron 1.0 (EDIT: Now 1.2)
- Replies: 214
- Views: 221224
Re: Oricutron 1.0 (EDIT: Now 1.2)
"paste" put the text in a queue buffer which is used by ay_ticktock() in file 8912.c. If the queue buffer isn't empty, the CheckKbd routine in ROM is not really executed but simulated by Oricutron. I think there is a bug in function ay_ticktock() when the IRQ is raised while the 6502 execu...
- Thu Nov 01, 2018 2:41 pm
- Forum: 6502 assembly coding
- Topic: My first ASM and it doesnt do what I expect
- Replies: 5
- Views: 7952
Re: My first ASM and it doesnt do what I expect
You're right Dbug
decrem must be:
decrem must be:
Code: Select all
decrem
sec ; Calc new display address
lda write+1 ; LSB
sbc #40
sta write+1
lda write+2 ; MSB
sbc #0
sta write+2
- Thu Nov 01, 2018 1:04 am
- Forum: 6502 assembly coding
- Topic: My first ASM and it doesnt do what I expect
- Replies: 5
- Views: 7952
Re: My first ASM and it doesnt do what I expect
I think the first error is a confusion: #define define a constant. The line #define DISPLAY_ADRESS ($BB80+37+Y_POS*40) define a constant, not a variable. Second, you use Y as a row index and do a sta xxxx,y in order to put a character on the row Y of the screen. But one row is 40 characters,if you w...
- Fri Jun 29, 2018 11:29 am
- Forum: Emulators
- Topic: Oricutron : Joysticks not working
- Replies: 1
- Views: 6133
Re: Oricutron : Joysticks not working
I think the issue is in joy_build_mask() function in joystick.c If you uncomment the sprintf() call in joy_filter_event() function, you can see the joystick state changing in the title bar of the window. In the joy_build_mask(): the joystick state mask is only build when joyinterface is set to 'ijk'...
- Sat May 19, 2018 12:40 pm
- Forum: 6502 assembly coding
- Topic: 6502 flags C, N, Z, V and tests
- Replies: 7
- Views: 10536
Re: 6502 flags C, N, Z, V and tests
Sometimes you can also use the BIT instruction: "BIT sets the Z flag as though the value in the address tested were ANDed with the accumulator. The S and V flags are set to match bits 7 and 6 respectively in the value stored at the tested address." I have often seen using this instruction ...
- Tue May 08, 2018 3:15 pm
- Forum: Tape and floppy disk converters
- Topic: Oric Explorer v2.0 is up for adoption!!!
- Replies: 34
- Views: 31322
Re: Oric Explorer v2.0 is up for adoption!!!
Hi,
NekoNoNiaow, I can start OricExplorer v2, reviewed in CEO, on Linux with Mono, so maybe you can start it with the Mono port on Mac OS too.
NekoNoNiaow, I can start OricExplorer v2, reviewed in CEO, on Linux with Mono, so maybe you can start it with the Mono port on Mac OS too.
- Sun Apr 29, 2018 8:36 pm
- Forum: Cross development tools
- Topic: BomberZ.bas and bas2tap ..
- Replies: 20
- Views: 22248
Re: BomberZ.bas and bas2tap ..
I have my own "virtualbasic like" written in shell.
In case you want try BomberZ, here is the tap file.
In case you want try BomberZ, here is the tap file.