I would like to have my paper biverted please.
129 Nov 24, 2018 6:50 am
Re: A dedicated nanoloop device: what is? (21 replies, posted in Other Hardware)
130 Nov 21, 2018 7:53 pm
Re: A dedicated nanoloop device: what is? (21 replies, posted in Other Hardware)
oh wow, that is pretty interesting. I want to tear it open so badly. 
131 Nov 20, 2018 11:08 pm
Re: Need help on adding a voltage regulator to DMG (8 replies, posted in Nintendo Handhelds)
Yeah, the CPU-08 is excellent and does have a newer revision power regulator board.
132 Nov 18, 2018 1:45 am
Re: Need help on adding a voltage regulator to DMG (8 replies, posted in Nintendo Handhelds)
The battery contact itself should be fine for an unregulated source, but like Apeshit said, you can't just 'replace' the original regulator. It produces both +5v AND -21. The LCD needs this to function so you'll need to keep it in there.
133 Nov 14, 2018 8:17 pm
Re: KItsch-Bent MIA? (14 replies, posted in General Discussion)
You know this seems like a huge misunderstanding being blown out of proportion by speculation.
1. GB-303 has had production problems before. If a recall had to be made on the stock, then it may have interfered with orders.
2. The post loses packages on occasion, and Kitsch took responsibility for it once alerted to the problem. He had done so for an order of my own in the past.
3. Deliveries seem to be randomly packed with propaganda from a wide range of organizations including but not limited to stores, artists, musicians, stickers, shirtless men on horses, etc. If an insert was paid for by a religious organization, it does not necessarily reflect the views and opinions of Kitsch. Its no different than the My Pillow Guy showing up on Hulu. I don't use a pillow, therefore I hate Hulu. ... ?
Besides, life happens to most people. Deaths, breakups, vacations. I think someone like Kitsch with such an extensive track record of successful orders and happy customers deserves a bit of cred.
134 Oct 30, 2018 8:05 pm
Re: HEEBIE 2 - Freebie-GBs 2019 & Cartridges (64 replies, posted in Collaborations)
wowowowow. excited!
135 Oct 26, 2018 10:58 pm
Re: Mapping Hex Values in ASM (15 replies, posted in Nintendo Handhelds)
Orgia Mode wrote:
irrlichtproject wrote:You need an opcode table that lists instruction timings. I used this one: http://www.pastraiser.com/cpu/gameboy/g … codes.html
Not the best but it does the job. The timings are listed below the opcode names; the number to the left is the instruction size in bytes, and the one to the right is the cycle count.That is very helpful. I think I came across that page ears ago, but didn't need it at the time. Thanks!
Can anyone elaborate on these bullet points:
source>>If the wave channel is enabled, accessing any byte from $FF30-$FF3F is equivalent to accessing the current byte selected by the waveform position. Further, on the DMG accesses will only work in this manner if made within a couple of clocks of the wave channel accessing wave RAM; if made at any other time, reads return $FF and writes have no effect.
>>Triggering the wave channel on the DMG while it reads a sample byte will alter the first four bytes of wave RAM. If the channel was reading one of the first four bytes, the only first byte will be rewritten with the byte being read. If the channel was reading one of the later 12 bytes, the first FOUR bytes of wave RAM will be rewritten with the four aligned bytes that the read was from (bytes 4-7, 8-11, or 12-15); for example if it were reading byte 9 when it was retriggered, the first four bytes would be rewritten with the contents of bytes 8-11. To avoid this corruption you should stop the wave by writing 0 then $80 to NR30 before triggering it again. The game Duck Tales encounters this issue part way through most songs.
Alright, I think I figured it out.
When I reload $FF30 - $FF3F, have to turn it off, then load it and then re-enable it and then re-start the wave form, like so:
updateWaveSample:
; check if a new sample was selected, other wise skip it.
.tstOldWave:
ld a, [AUD3wave_RAM]
ld hl, AUD3wave_RAMold
cp [hl]
jp z, .noWaveUpdate ; skip if they are exactly the same
; otherwise, choose which sample to load
ld h, waveTables>>8 ; its currently at $3200
ld a, [AUD3wave_RAM] ; $00-$FF
and %11110000 ; clear lower 4-bits, leaving 16 values for the user to select.
ld l,a ; hl now points to the selected sample.
ld a,$30
ld c,a ; C is the counter
xor a
ld [rAUD3ENA],a ; disable the wave channel here... test
.waveLoad:
ld a,[hl+] ; load the first byte sample, then increment the pointer
ld [c],a ; Put A into address $FF00 + C
inc bc ; c = $30,31 ... 3F
ld a,c
cp ($3F+1)
jp nz,.waveLoad
ld a, $80
ld [rAUD3ENA],a ; re-enable the wave channel here... test
; also need to re-start the wave channel with rAUD3HIGH bit 7
; get the current upper 3-bits of the frequency again. (it cannot simply be read from the register.)
ld h, expoTable>>8
ld a, [AUD3freq_RAM]
ld l,a
ld a,[hl] ; A reg has high 3 bits.
set 7,a ; when set, sound restarts.
ld [rAUD3HIGH],a
; waveLoading finished when $3F is loaded
ld a, [AUD3wave_RAM]
ld [AUD3wave_RAMold],a ; update the old user's input for wave ram selection
.noWaveUpdate:; other irrelevant stuff removed for brevity
ret
it seems to test correctly in several emulators, simulating a variety of CPU's.
136 Oct 26, 2018 8:19 pm
Re: Mapping Hex Values in ASM (15 replies, posted in Nintendo Handhelds)
irrlichtproject wrote:
You need an opcode table that lists instruction timings. I used this one: http://www.pastraiser.com/cpu/gameboy/g … codes.html
Not the best but it does the job. The timings are listed below the opcode names; the number to the left is the instruction size in bytes, and the one to the right is the cycle count.
That is very helpful. I think I came across that page ears ago, but didn't need it at the time. Thanks!
Can anyone elaborate on these bullet points:
source
>>If the wave channel is enabled, accessing any byte from $FF30-$FF3F is equivalent to accessing the current byte selected by the waveform position. Further, on the DMG accesses will only work in this manner if made within a couple of clocks of the wave channel accessing wave RAM; if made at any other time, reads return $FF and writes have no effect.
>>Triggering the wave channel on the DMG while it reads a sample byte will alter the first four bytes of wave RAM. If the channel was reading one of the first four bytes, the only first byte will be rewritten with the byte being read. If the channel was reading one of the later 12 bytes, the first FOUR bytes of wave RAM will be rewritten with the four aligned bytes that the read was from (bytes 4-7, 8-11, or 12-15); for example if it were reading byte 9 when it was retriggered, the first four bytes would be rewritten with the contents of bytes 8-11. To avoid this corruption you should stop the wave by writing 0 then $80 to NR30 before triggering it again. The game Duck Tales encounters this issue part way through most songs.
137 Oct 25, 2018 10:29 pm
Re: Mapping Hex Values in ASM (15 replies, posted in Nintendo Handhelds)
NICE!! Thats 4-cycles per CALL and I actually call it several times in the full loop.
Hey hey, how did you calculate the cycles saved?
138 Oct 25, 2018 8:59 pm
Re: Mapping Hex Values in ASM (15 replies, posted in Nintendo Handhelds)
Finally figured it out...ish.
As I stated before, I was taking a number between 0 and 255 and assigning a frequency value, but the gameboy needs an 11-bit number for the registers AUD1LOW and AUD1HIGH (and others). So I then took my frequency table and converted it BACK into a digital value with x=2048-(131072/Hz).
expoTable EQU $3000
SECTION "expotable",HOME[$3000]
;expoTable ; 512 bytes (256 integers)
; This table is not perfect by any means. I'll make the final "tuning" adjustments later.
DW 44, 98, 150, 201, 250, 299, 346, 391, 436, 479, 521, 562, 602, 641, 678, 715, 751, 786, 819, 852, 884, 916, 946, 976, 1004, 1032, 1060, 1086, 1112, 1137, 1161, 1185, 1208, 1231, 1253, 1274, 1295, 1315, 1335, 1354, 1372, 1391, 1408, 1425, 1442, 1458, 1474, 1489, 1504, 1519, 1533, 1547, 1560, 1574, 1586, 1599, 1611, 1622, 1634, 1645, 1656, 1666, 1676, 1686, 1696, 1706, 1715, 1724, 1732, 1741, 1749, 1757, 1765, 1773, 1780, 1787, 1794, 1801, 1808, 1814, 1820, 1826, 1832, 1838, 1844, 1849, 1855, 1860, 1865, 1870, 1874, 1879, 1884, 1888, 1892, 1897, 1901, 1905, 1908, 1912, 1916, 1919, 1923, 1926, 1929, 1933, 1936, 1939, 1942, 1944, 1947, 1950, 1953, 1955, 1958, 1960, 1962, 1965, 1967, 1969, 1971, 1973, 1975, 1977, 1979, 1981, 1983, 1985, 1986, 1988, 1989, 1991, 1993, 1994, 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2018, 2019, 2020, 2021, 2021, 2022, 2023, 2023, 2024, 2025, 2025, 2026, 2027, 2027, 2028, 2028, 2029, 2029, 2030, 2030, 2031, 2031, 2032, 2032, 2033, 2033, 2033, 2034, 2034, 2035, 2035, 2035, 2036, 2036, 2036, 2037, 2037, 2037, 2037, 2038, 2038, 2038, 2039, 2039, 2039, 2039, 2040, 2040, 2040, 2040, 2040, 2041, 2041, 2041, 2041, 2041, 2042, 2042, 2042, 2042, 2042, 2042, 2043, 2043, 2043, 2043, 2043, 2043, 2043, 2043, 2044, 2044, 2044, 2044, 2044, 2044, 2044, 2044, 2044, 2045, 2045, 2045, 2045, 2045, 2045, 2045, 2045, 2045, 2045, 2045, 2045, 2046, 2046, 2046, 2046, 2046, 2046, 2046, 2046, 2046, 2046
Then to grab a number in my update code:
updateFreq12:
ld hl, expoTable
ld a, [AUD1freq_RAM] ; the 8-bit number from 0-255; located at $D00x for the record
ld l,a
ld a,[hl+] ; A reg has high 3 bits. HL points to lower 8 now
ld [rAUD1HIGH],a
ld a,[hl]
ld [rAUD1LOW],a
ret
Alternatively, I can get the 16-bit number from my table and shift the top 3 bits into AUD1HIGH, then load the remaining number into AUD1LOW. This process more closesly answers my original question. 
I'll code it up and see which compiles to the fewest lines.
Thanks so much for your help, guys!
139 Oct 23, 2018 7:08 pm
Re: Mapping Hex Values in ASM (15 replies, posted in Nintendo Handhelds)
Alright, I finally figured out the math I needed. Now all I have to do is shift the bass note around until I get the notes I want to hear I guess.
› Show Spoiler
I have primed all of the registers to be ready for user input and found that the noise channel is the most fun to play with!
Most noteable the AUD4POLY register. The broad range sund taht it can produce is outstanding.
@nitro, is that what shit wave does? Just inject horseshit into the polynomial counter?
EDIT: Shower thought, why is NR20 unused while NR10 (sweep) is present? The corresponding bytes in I/O are simply ignored, along with several other bytes, but this one in particular seems to have been planned ahead. A missed opportunity.
140 Oct 20, 2018 1:06 am
Re: Mapping Hex Values in ASM (15 replies, posted in Nintendo Handhelds)
I just threw this together in excel and I think it should work for me, if not at least for initial tests. It is 2048 numbers, increasing from 0 - 2047 exponentially (rounded up to the next whole number). I might need to shift it to align with a scale, but I'm currently happy although its bigger than I originally planned.
Text wall:
› Show Spoiler
EDIT: Crap...I did taht wrong. I have to translate an 8-bit number to an 11 bit number, not 11 to 11. 
141 Oct 19, 2018 10:18 pm
Re: Mapping Hex Values in ASM (15 replies, posted in Nintendo Handhelds)
Thats very helpful, nitro. I will shoot for all 6-octaves, however I do want my program to be able to produce every possible frequency within the constrains of the cpu (64-131072Hz), given user's input. And yes, it is for musical purposes.
When you say "pure tones" do you mean only the classically tuned notes within the ET12? After C#10 can it no longer precisely maintain the 12 tones?
I am just about to the point in code to begin using the lookup table.
142 Oct 16, 2018 9:17 pm
Re: Mapping Hex Values in ASM (15 replies, posted in Nintendo Handhelds)
irrlichtproject wrote:
What exactly do you want to do? Sounds like you're trying to generate note frequency dividers. If that's the case I'd definately recommend using a lookup table. It's gonna cost you 512 bytes at most.
Otherwise, just ld a,n, add a,a, rotate the carry into another register, rinse and repeat.
Thanks for the reply!
I am trying to receive serial data and convert it to a frequency, yes.
Now that I think about the size of a lookup table in actual quantized bytes, it may not be as large as I had originally thought. Since I have to worry about two registers, one 8-bits and one 3-bits (11-bits in total) that can equate to 256+8 numbers, so 512 was a very generous guess.
Now the next question: which method would require the fewest cpu cycles?
Once I get to this point in the code, I will write up both routines and add up the cpu cycles for each.
Again, thanks for the input!
-Cheers,
-Fox
143 Oct 15, 2018 10:37 pm
Topic: Offering PCB work (1 replies, posted in Trading Post)
Hello all,
I have some free time on my hands to assist in either PCB layout or even light engineering. Both Digital or analog design, but I will currently not be offering any firmware programming as of right now as I have a few projects of my own IP that I need to dedicate that time to.
hmu for any questions, ideas or just to see some of my portfolio.
Cheers,
Fox
144 Oct 15, 2018 8:18 pm
Topic: Mapping Hex Values in ASM (15 replies, posted in Nintendo Handhelds)
Can anyone point me in the right direction? I am attempting to map a value range to another value range as explained here, but I wish to do so in Assembly; more specifically, in GBZ80 ASM.
EDIT: Also worth mentioning, I don't want to use a look-up table because it would be massive for my purposes. I just need to scale a 'linear' 8-bit number from 0x00 - 0x255 to an 'exponential' 11-bit number from 0x00 - 0x7FF.
Can I Load the number into a register, (eg. A) and shift it to the left once? Obviously I need to worry about the three bits of carry too.