This file contains, in reverse chronological order, the list of changes for each of the releases that followed the break away from Git. For changes prior to that, download the git archive from http://collapseos.org and use "git log". Most of these releases break bootstrapping. This means that if you begin with an up-to-date Collapse OS on a system that self-hosts and simply update your blkfs media to that of the new release, you won't be able to build a new system. Most of the time, the reason for it is trivial and all you need to do is to sprinkle some "shim words" around. Sometimes, it's not trivial. All of this to say: most of the time, the easiest way to deploy an updated Collapse OS after a new release is to build the binary from a POSIX machine. *** 2021-10-07 - Continue progress with Apple IIe port. Still a WIP. - Add INLINE. See doc/usage.txt. - Rework the HAL significantly. See doc/hal.txt. - Simplify DOER/DOES> and add CDOES>, a way to have does words with native code. See doc/usage.txt - Remove ENTRY which became the same as CODE with DTC. - Change ALIAS semantics and make it read-only. See doc/usage.txt - Make *ALIAS and *VALUE read-only and only available to xcomp. This means removing *TO and [*TO]. - Add layer of indirection in VALUE. lblpush was replaced with lblval. - z80: move cell routine to RST, making CREATE more compact. - Bring CONSTANT and CONSTS back - Bring +! back. - Make VALUES always initialize to 0. - Add A register. See doc/usage.txt *** 2021-09-24 - Fix broken CODE[ ]CODE for any arch with JROFF != 0, that is all but CVM. - z80: fix scrolling bug in dan SBC drivers. (Daniel Marks) - Add 6502 assembler. - Begin a port of Collapse OS for the Apple IIe. This is a WIP. - Add doc/arch.txt to explain clearly how to do cross-arch deployments. - Move assemblers to arch-specific blk.fs units. - Move AVR assembler and related code into its own "portless" arch. - sms: have the Makefile automatically build the AVR firwmware for PS/2. *** 2021-09-17 - HAL: add CALLi and (i)>w. - Simplify DOES> logic with the addition of DOER. See doc/primer.txt. - Make Collapse OS into a Direct Threaded Code forth. See doc/impl.txt. - Remove unused I' and J. - Move MOVE- from core to B120. - Move PAD to SYSVARS. - Remove QUIT jump from stable ABI. With DTC, we can easily call it directly. - Add Dan SBC. See doc/hw/z80/dan.txt. (Daniel Marks) - trs804p: fix broken RXMEM in B121. *** 2021-08-02 - New app: the Memory Editor. See doc/me.txt - Change FIND/PARSE order during INTERPRET and :. See doc/usage.txt - VALUES can now contain regular (single) words, not only literals. - Remove unused BIN+. - Strings are now passed "unpacked" (sa sl) rather than encoded. This allows a simplification of the word-reading routine. - Make FILL, MOVE and MOVE- into native words. They are often performance bottlenecks and those are the kind of operations that often have specialized CPU ops (in z80 and 8086 at least). - cvm: implement grid's NEWLN, allowing scrolling. - Make hex literal parsing case insensitive. - Add word INDEX. See doc/blk.txt - Begin improving code with INDEX-friendly first lines in each block. - Add "Application loaders" to BLK subsystem. See doc/blk.txt - z80/sms: fix a couple of broken xcomp units. - Remove unused LOAD+, LOADR+. - Remove the ability to nest LOADs, simplifying code. - Use VALUE instead of VARIABLE for assembler labels. - Remove unused VARIABLE. We always use either VALUE or CREATE instead. - grid: remove unused XYMODE. It was only necessary when VE used AT-XY and EMIT, but now that it mostly uses CELL!, this hack became spurious. - blk: make BLKDTY into a *VALUE. - VE: use CELLS! instead of CELL! where appropriate. *** 2021-07-26 - trs804p: implement fully native drivers and bootloader! - Make BLK into a separate subsystem and remove indirection layer in BLK@* and BLK!*. See doc/blk.txt. - Remove "0b" literals. - Change "0x" literal prefix to the more traditional (and simple to parse) "$". - Rename (parse) to PARSE. - VE: change cmd prefix from $ to % to avoid clashing with literals. - z80: simplify and optimize FIND implementation. - Make dict previous entry offsets absolute instead of relative. - Move HERE and CURRENT initialization, which was previously arch-specific code to arch-independant Forth code. - Remove EMPTY and make BOOT user-callable. - Add word "MEM>BLK" in B121. - Add word "context" in B122. See doc/usage.txt. - xcomp: improve error handling and documentation (doc/cross.txt). - VE: Replace many AT-XY calls with CELL!, making screen refreshes faster and less noisy. - grid: Change NEWLN signature, giving more flexibility to video drivers in handling the event. See doc/grid.txt. - grid: Add CELLS! optional word, which can greatly speed up screen refreshes. - Remove RCS metadata which doesn't have much advantage over comparing tarball snapshots. - ed+VE: Make IBUF and FBUF into counted strings, making their manipulation more straightforward. - Redefine "empty char cell" as $20 rather than $00. Affects WIPE and IBUF/FBUF. - VE: display all characters as-is rather than spitting chars lower than $20 as $20. Previously, $00 chars all over the place would make the screen unreadable, but now it works. - blkpack: fill with $20 instead of zeroes. - VE: Stop using RDLN for input. It wasn't working well with IBUF/FBUF as counted strings. - Remove KEY> putback buffer which isn't needed anymore. With hindsight, piggybacking on RDLN from VE wasn't such a clever idea after all. It introduced significant "side-complexity". - emul: remove TRS-80 4P emulator. It wasn't emulating at the proper level any more and I didn't want to write another. *** 2021-06-16 - Change word type numbering scheme. It's now simpler to decode. See doc/impl.txt - Rename CONSTANT to VALUE, *! to VAL!, **! to *VAL!, CONSTS to VALUES. - Rename :* to ALIAS, :** to *ALIAS. - Add *VALUE, TO, *TO, [TO] and [*TO]. See doc/usage.txt - Make CURRENT, HERE, IN(, IN> and BLK> into *VALUE. - Add KEY> and NL values to avoid SYSVARS offset hardcoding. - Make SYSVARS more compact. - Remove unused +!, EOT? and RAM+. - Simplify VE. - asm: make ORG and BIN( into VALUEs. - cvm: make code follow C89 rather than C99, remove usage of stdbool and stdint. - Re-add 'S and S0, add 'R, R0 and .S - Remove overflow checks. See doc/impl.txt for rationale. - Simplify EOT handling in WORD and document EOT quirk in initialization sequence better. See doc/impl.txt - Move AVR firmware from doc/hw/z80/sms/code/smsps2ctl.fs to the blkfs. Firmware for microcontrollers of supported hardware should be part of the OS itself. - Remove |L and rename |M to L|M. - Add the "Useful little words" section at B120, starting with nC,. - trs804p: add support for double-density disks. - Replace initialization string with initialization wordref in stable ABI. *** 2021-05-15 - Add native >>, <<, >>8, <<8 words. - Make |L, |M, RSHIFT and LSHIFT into regular Forth words. - Rename (entry) to ENTRY. - Add PAD and have it replace WORDBUF in SYSVARS. - The 6809 emulator is now usable. - Little optimizations sprinkled around. - xcomp: remove a little cruft. - Stop using null char termination as buffer bound in RDLN. We now use the whole buffer for typed contents. - Make LOAD line-based. - Add line comments with "\". - Make BLK buffer allocated at compile time. - Add CONSTS word. - Re-add tests in extras. This time, they can conveniently be ran from a "native" Collapse OS machine (rather than needing POSIX), which makes them more interesting. - Tidy up 8086 code and improve docs. - Improve asm docs. - z80 asm: remove IX- and IY-. - Remove CARRY? support for *. Unused yet and too complex to implement on 6809. - 8086: implement CARRY?. - 6809: implement CARRY?. - Add RANGE and SRANGE, making loops over memory simpler. - Simplify literal parsing. *** 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