*** 2021-04-21 - cvm: rename "forth" to "cos-grid" and add new "cos-serial" binary. - z80 asm: add CALLc op. - z80 asm: Add LDHL(HL), and LDBC(HL), macros. - z80: use DE instead of BC to store IP. This opens the door to interesting optimizations. I took inspiration from Brad Rodriguez's CamelForth for this. I'm not planning, however, on having an in-register TOS like Brad does. It looks real neat, but Brad doesn't check for overflow/underflow like I do and I'm thinking I'd mess things up with this kind of scheme. - z80: optimize next, exec, (br), (n), EXIT, LSHIFT, RSHIFT for speed. - z80: minimize overflow checks through counter system. - z80: IY register, which was previously unused, is now reserved for pointing to SYSVARS. - Make 2DUP, 2DROP, > into regular Forth words. Not worth keeping as native. - Add CARRY? mechanism. See usage.txt. Not done for 8086 and 6809 yet. - In folder extras/, there's a WIP 6809 emulator written in Forth for Collapse OS. This should make Collapse OS a much cozier development environment. *** 2021-04-03 - xcomp: add XWRAP". - asm: remove BREAK,. Too complex and hackish for what it's worth. - Remove barely used word IMMED? - 8086 asm: add CMPri, CMPxi, and CMPxI, - 8086: inline chkPS, code and make more compact. - z80: make chkPS, parametrizable and inlined. - z80: optimize lblexec for speed - 6809 asm: fix broken [] addressing mode. - trs804p: fix broken emulator. - cvm: make oflw/uflw checks behave like other ports. It previously cheated, making CVM behavior slightly different. - Check for overflow less often. Previously, we would check at every "next" call. Now, we check upon entering a compiled word and at the end of any native word with a "positive" PS balance. - Fix PC/AT MBR for some machines. (Jakob Krisch) - VE: refactor a little bit. *** 2021-03-20 - Complete the 6809/CoCo2 port! - Handle SHIFT in (key?) - Implement the Grid protocol - Implement stack overflow/underflow detection - Implement QUIT and ABORT - Add doc/hw/6809/coco2.txt - This makes Collapse OS run properly on the CoCo2. No BLK yet, but otherwise fully functional. Keyboard debouncing is still a bit shaky, but it doesn't make the system unusable. - Big blkfs reshuffling. The idea was to make stuff that belong together con- tiguous. Also, I brought back arch-specific device drivers into the main blkfs space. When I created the arch overlay system, I hadn't yet started offloading docs and code comments to the doc/ folder. Now that it's done, arch-specific code isn't as heavy as it used to be, so putting everything under the same blkfs makes sense again. See doc/usage.txt - Remove PICK: Too complex for what it's worth. - Remove 'S and S0: When I began, I thought I'd play with PS a lot through those, but it turns out I never needed them. - trs80-4p: Allow BREAKing out of I/O induced infinite loops. - 6809 asm: detect 8-bit branching overflow. *** 2021-03-03 - 6809 port: we have prompt! a barely usable one, but still feels good! - Fix bugs in 6809 assembler - Implement (imperfectly) the XMODEM protocol in the Remote Shell app. - tools: make blkup slightly faster. - xcomp: re-add X' which I though wasn't used, but was. - Remove automated testing. Most of the problems popping up in Collapse OS development are hardware-related. Moreover, now that I use Collapse OS to develop Collapse OS, "userland" is pretty well tested that way. This removal allows me to remove tooling that is annoying to keep around. - Fix endian issues in core words. - Remove unused WIPED? from core. - cvm: make WCOLS/WLINES adjustments easier. only one place to adjust now. - cvm: simplify the staging program. - doc: add code subsection. - Remove unused >< and >=0 and simplify =><=. - Make z80 boot code more compact *** 2021-02-19 - Make good progress on 6809 port! - Add W"" literal, allowing to "compile" WORD-using words. For example, ": foo W" hello" CREATE ;" becomes possible. - Remove "~C!" mechanism. It was unnecessary and slow. Made the AT28 driver, the reason for this system, use simple C! and ! overrides. - Remove 0, 1 and -1 native words and replace them with (b). It makes porting simpler and makes binaries slightly slimmer overall. - Make S0 into a Forth word. - Add []= and make S= into a Forth word. - Remove CMP and make =, < and > native. - Improve 6809 assembler. - Make xcomp tools endian-aware. - Replace native _find with FIND. We don't need to find words in alternate dicts anymore now that we have XFIND. - DOES>: swap PFA and jump address so that more than 2b can be attached it. As a bonus, fix DOES> on 8086. It was simply broken. - Improve documentation, especially impl.txt which had a lot of out-of-date and incomplete information. *** 2021-02-11 - Add 6809 port WIP! Well, more of a placeholder... or a sneeze, really. But it's a first step, and it actually runs on actual hardware and was developed and deployed from Collapse OS itself. - Rename HERE to H and H@ to HERE. I had it all wrong... - Make QUIT and ABORT into native words. - Remove ROLL which wasn't used anywhere. - Add |T T! and T, words to assemblers. See "Endian-ness" in doc/cross.txt. - Add "QUIT jump" to stable ABI. - Fix endian-ness bugs in 6809 assembler - Add "LIVETGT" helper to assemblers. See "Live Targets" in doc/asm/intro.txt. - Improve Remote Shell reliability. It's now reliable enough for "rupload" to be used for real stuff (for example, writing 6809 binaries to EEPROM!) - tools: make blkunpack right-trim whitespaces. - trs80-4p can now use both floppy drives. - trs80-4p add WIP "native" keyboard driver in effort to remove dependency on TRS-DOS. - trs80-4p: improve RS-232 driver. - Place Z80 drivers together in their own little zone in blkfs. - Make font compilers more compact and fix a few glitches. *** 2021-01-25 - Make Z80 and 8086 assemblers more compact - Add 6809 assembler - Create a new "asm" folder in doc, making it clearer. - Add KEY> core word - Fix PS leak in DUMP - Improve VE *** 2021-01-19 - Remove "breathing" in tools/. Now that we have proper RTS/CTS in place, this mechanism is spurious. - Improve VE. - Remove C