The Usotsuki Posted December 23, 2022 Share Posted December 23, 2022 Didn't want to crapflood another site with my experiments, but I've been working on this... Girl's Garden for Nabu (only partially functional), based on Ricardo Bittencourt's MSX port. Disk image/some code Most issues with this are keyboard-related; there's some sound issues too. 3 Quote Link to comment https://forums.atariage.com/topic/345398-experiments-with-the-nabu/ Share on other sites More sharing options...
+eebuckeye Posted December 23, 2022 Share Posted December 23, 2022 Very interesting to see where this all leads. My Nabu should arrive in a few weeks.. Is there a way now to load directly without having to setup an external PC? Quote Link to comment https://forums.atariage.com/topic/345398-experiments-with-the-nabu/#findComment-5176482 Share on other sites More sharing options...
The Usotsuki Posted December 23, 2022 Author Share Posted December 23, 2022 There's a floppy system, though it requires a change of ROMs. I think there was talk of cloning the controller over on VCFED (the "another site" I was referring to). This port assumes its presence; it loads from CP/M 3.1 (just like how the MSX version loads from MSX-DOS). Quote Link to comment https://forums.atariage.com/topic/345398-experiments-with-the-nabu/#findComment-5176493 Share on other sites More sharing options...
The Usotsuki Posted December 25, 2022 Author Share Posted December 25, 2022 I'm thinking about how it might be easiest to port MSX games. A lot of stuff does seem to utilize the BIOS at least for an abstraction layer for the VDP and PSG. (Same chips; different port numbers.) So far as this is done, runtime patching won't be necessary, just an implementation of a subset of the MSX BIOS (although getting it loaded at 0x0000 instead of 0x0100 is going to be a trick - but Girl's Garden does the same relocation trick.) Stuff like the controllers, though, may need runtime patching. Quote Link to comment https://forums.atariage.com/topic/345398-experiments-with-the-nabu/#findComment-5177562 Share on other sites More sharing options...
The Usotsuki Posted February 27, 2023 Author Share Posted February 27, 2023 OpenNabu - replacement boot ROM for the Nabu I can't believe I actually did this and it worked. Still tuning it a bit. 1 Quote Link to comment https://forums.atariage.com/topic/345398-experiments-with-the-nabu/#findComment-5216798 Share on other sites More sharing options...
The Usotsuki Posted March 25, 2023 Author Share Posted March 25, 2023 A couple things here... I put the boot ROM up on GitHub. https://github.com/buricco/opennabuipl I'm trying to port games from the MSX - I know this is about a fool's errand. I'd about like to have others help with this idea (targetting CP/M). 1 Quote Link to comment https://forums.atariage.com/topic/345398-experiments-with-the-nabu/#findComment-5231097 Share on other sites More sharing options...
The Usotsuki Posted March 27, 2023 Author Share Posted March 27, 2023 owo what's this? I have found and disassembled the joystick routine, but can't understand it yet. Ports DC and DD are the SG-1000 joystick ports. I know how to read the Nabu ones (though it's a bit more esoteric and I might do so through a graft onto the IRQ handler). 0b01 3a 00 c0 L0B01: ld a, (0xC000) 0b04 a7 and a 0b05 28 14 jr z, L0B1B 0b07 db dc in a, (0xDC) 0b09 47 ld b, a 0b0a f6 c0 or 0xC0 0b0c 4f ld c, a 0b0d db dd in a, (0xDD) 0b0f f6 c0 or 0xC0 0b11 cb 10 rl b 0b13 17 rla 0b14 cb 10 rl b 0b16 17 rla 0b17 47 ld b, a 0b18 c3 ac 0b jp L0BAC 0b1b 3e 07 L0B1B: ld a, 7 0b1d d3 de out (0xDE), a 0b1f db dc in a, (0xDC) 0b21 47 ld b, a 0b22 f6 c0 or 0xC0 0b24 4f ld c, a 0b25 3e 07 ld a, 7 0b27 d3 de out (0xDE), a 0b29 db dd in a, (0xDD) 0b2b cb 10 rl b 0b2d 17 rla 0b2e cb 10 rl b 0b30 17 rla 0b31 f6 c0 or 0xC0 0b33 47 ld b, a 0b34 3e 01 ld a, 1 0b36 d3 de out (0xDE), a 0b38 db dc in a, (0xDC) 0b3a cb 57 bit 2, a 0b3c 20 02 jr nz, L0B40 0b3e cb 90 res 2, b 0b40 cb 5f L0B40: bit 3, a 0b42 20 02 jr nz, L0B46 0b44 cb 88 res 1, b 0b46 3e 02 L0B46: ld a, 2 0b48 d3 de out (0xDE), a 0b4a db dc in a, (0xDC) 0b4c cb 4f bit 1, a 0b4e 20 02 jr nz, L0B52 0b50 cb 80 res 0, b 0b52 cb 67 L0B52: bit 4, a 0b54 20 02 jr nz, L0B58 0b56 cb a1 res 4, c 0b58 3e 03 L0B58: ld a, 3 0b5a d3 de out (0xDE), a 0b5c db dc in a, (0xDC) 0b5e cb 57 bit 2, a 0b60 20 02 jr nz, L0B64 0b62 cb 98 res 3, b 0b64 cb 67 L0B64: bit 4, a 0b66 20 02 jr nz, L0B6A 0b68 cb a9 res 5, c 0b6a 3e 04 L0B6A: ld a, 4 0b6c d3 de out (0xDE), a 0b6e db dc in a, (0xDC) 0b70 cb 6f bit 5, a 0b72 20 02 jr nz, L0B76 0b74 cb 89 res 1, c 0b76 3e 05 L0B76: ld a, 5 0b78 d3 de out (0xDE), a 0b7a db dc in a, (0xDC) 0b7c cb 6f bit 5, a 0b7e 20 02 jr nz, L0B82 0b80 cb 91 res 2, c 0b82 3e 06 L0B82: ld a, 6 0b84 d3 de out (0xDE), a 0b86 db dc in a, (0xDC) 0b88 cb 6f bit 5, a 0b8a 20 02 jr nz, L0B8E 0b8c cb 99 res 3, c 0b8e cb 77 L0B8E: bit 6, a 0b90 20 02 jr nz, L0B94 0b92 cb 81 res 0, c 0b94 3e 05 L0B94: ld a, 5 0b96 d3 de out (0xDE), a 0b98 db dd in a, (0xDD) 0b9a cb 5f bit 3, a 0b9c 20 02 jr nz, L0BA0 0b9e cb a0 res 4, b 0ba0 3e 06 L0BA0: ld a, 6 0ba2 d3 de out (0xDE), a 0ba4 db dd in a, (0xDD) 0ba6 cb 57 bit 2, a 0ba8 20 02 jr nz, L0BAC 0baa cb a8 res 5, b 0bac 3a 70 c0 L0BAC: ld a, (0xC070) 0baf b7 or a 0bb0 c0 ret nz 0bb1 21 0e c0 ld hl, 0xC00E 0bb4 cb 7e bit 7, (hl) 0bb6 20 15 jr nz, L0BCD 0bb8 79 ld a, c 0bb9 2f cpl 0bba e6 30 and 0x30 0bbc 28 05 jr z, L0BC3 0bbe cb fe set 7, (hl) 0bc0 cb b6 res 6, (hl) 0bc2 c9 ret 0bc3 78 L0BC3: ld a, b 0bc4 2f cpl 0bc5 e6 30 and 0x30 0bc7 c8 ret z 0bc8 cb fe set 7, (hl) 0bca cb f6 set 6, (hl) 0bcc c9 ret 0bcd cb 76 L0BCD: bit 6, (hl) 0bcf 28 08 jr z, L0BD9 0bd1 3a 91 c0 ld a, (0xC091) 0bd4 fe 50 cp 0x50 0bd6 78 ld a, b 0bd7 28 01 jr z, L0BDA 0bd9 79 L0BD9: ld a, c 0bda 2f L0BDA: cpl 0bdb 32 08 c0 ld (0xC008), a 0bde c9 ret Also have found that all the PSG hits are concentrated together. Might just replace the code with the MSX equivalent (same chip as the Nabu, different from the SG), dunno. Quote Link to comment https://forums.atariage.com/topic/345398-experiments-with-the-nabu/#findComment-5231902 Share on other sites More sharing options...
The Usotsuki Posted April 18, 2023 Author Share Posted April 18, 2023 I've got a nearly complete disassembly of the MSX version, and I'm wracking my brain trying to figure out how to unstick the controls. 1 Quote Link to comment https://forums.atariage.com/topic/345398-experiments-with-the-nabu/#findComment-5242045 Share on other sites More sharing options...
The Usotsuki Posted April 28, 2023 Author Share Posted April 28, 2023 GETTO DAZE Quote Link to comment https://forums.atariage.com/topic/345398-experiments-with-the-nabu/#findComment-5246664 Share on other sites More sharing options...
The Usotsuki Posted May 2, 2023 Author Share Posted May 2, 2023 Quote Link to comment https://forums.atariage.com/topic/345398-experiments-with-the-nabu/#findComment-5248706 Share on other sites More sharing options...
RobertB Posted June 20, 2023 Share Posted June 20, 2023 We will have a Nabu PC on exhibit at the Pacific Commodore Expo NW this weekend. Hey, that's not a Commodore, Robert Bernardo Fresno Commodore User Group - http://www.dickestel.com/fcug.htm Southern California Commodore & Amiga Network - http://www.portcommodore.com/sccan June 24-25 Pacific Commodore Expo NW 2023 - http://www.portcommodore.com/pacommex 1 Quote Link to comment https://forums.atariage.com/topic/345398-experiments-with-the-nabu/#findComment-5272268 Share on other sites More sharing options...
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