https://pushbx.org/ecm/dokuwiki/ 2026-06-10T16:54:00+00:00 https://pushbx.org/ecm/dokuwiki/ https://pushbx.org/ecm/dokuwiki/lib/tpl/dokuwiki/images/favicon.ico text/html 2024-01-08T09:42:28+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0107_enhanced_dr-dos_single-file_load?rev=1704703348&do=diff Enhanced DR-DOS single-file load 2024-01-07 As I had previously mentioned on the FreeDOS FDISK bug tracker on github, I went and combined the EDR-DOS kernel files to create a single-file load experience. <https://pushbx.org/ecm/doc/ldosboot.htm#protocol-sector-iniload> <https://pushbx.org/ecm/doc/ldebug.htm#buildingprocess> <https://www.bttr-software.de/forum/forum_entry.php?id=20762&page=1&category=0&order=time> I also described some possible advantages to a single-file load in the BT… text/html 2024-09-10T19:06:11+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0910_early_september_work?rev=1725987971&do=diff Early September work 2024-09-08 The prior week nothing changed and that Sunday I didn't get to write a blog post regardless. This week some changes did happen. inicomp * Add _OPTIMISE_SMALL_INPUT define. Barely used yet. This actually sat in my repo for a while already but I only got around to committing it last Sunday. text/html 2024-07-14T20:48:06+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0714_early_mid_july_work?rev=1720982886&do=diff Early mid July work 2024-07-14 This week I started the ident86 project, which combines several parts to aid in comparing ports from one assembly language dialect to another. WarpLink The build using the mak.sh script now creates NASM listing files. These are for use with the convert listing files script. text/html 2024-09-17T20:26:41+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0917_early_mid_september_work_on_ldebug_edr-dos_and_ldos_instsect?rev=1726597601&do=diff Early mid September work on lDebug, EDR-DOS, and lDOS instsect 2024-09-15 lDebug * Add structure for Extension for lDebug (ELD) trailer header * Support ELD trailer header in debugger's ELD loader * Support ELD trailer header in list.eld * Add eldapend tool to create a file with ELD trailer header pointing at an ELD * text/html 2024-10-13T17:59:13+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/1013_late_september_early_october_work?rev=1728835153&do=diff Late September, early October work 2024-10-13 Last Sunday (2024-10-06) I travelled back from my partner's place, so I didn't get to write a blog post. Therefore we'll cover two weeks' worth of work today. kernwrap All of these changes were picked from lDebug. text/html 2024-01-24T11:33:24+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0124_december_january_work_brief_overview_of_the_last_6_weeks?rev=1706092404&do=diff December January work: Brief overview of the last 6 weeks 2024-01-21 It's been a while since I got to write one of my regular blog posts. Hence, forgive me for being brief. TracList * Round parens are accepted as relocation markers throughout * Allow to highlight opcode after brackets in a line * Allow highlighting when a line ends in a dash after machine code * Allow a match after brackets/parens, but not if the match would start with a relocated value text/html 2024-08-12T19:21:40+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0812_early_august_work?rev=1723483300&do=diff Early August work 2024-08-11 EIDL EIDL was a simple TSR that installed an int 28h handler which runs a hlt instruction, then chains to the prior handler. My adaptation of it combines the simple handler with the TSR example's multiplexer, as well as the optimal installation and advanced deinstallation method. text/html 2024-05-21T19:34:19+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0521_mid_late_may_work?rev=1716312859&do=diff Mid late May work 2024-05-19 lDOS MBR * Work around Book8088 / Xi8088 BIOS bug when detecting LBA * Optimisation: Do not zero CX after rep movsw * Normalise function 41h input al=dh=0 * Optimise: Share pushing DI before oldmbr CHS and LBA dispatch * Check for CHS overflow * Share setting DL after oldmbr CHS and LBA dispatch * Optimise: Make secpercyl a word, and re-use zero in DX * Drop CHS overflow check for last division, it is always passed text/html 2024-08-09T17:51:14+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0809_freedos-devel_mail_on_edr-dos_single-file_load_jwasm_port_and_ident86?rev=1723218674&do=diff freedos-devel mail on EDR-DOS single-file load, JWasm port, and ident86 Copied from my mail to the freedos-devel list. Hello Eric, hello list, On at 2024-07-26 13:04 +0200, Eric Auer via Freedos-devel wrote: " Hi! News from BTTR: <https://www.bttr-software.de/forum/board_entry.php?id=20959&page=0&order=time&category=0> while working on a single-file version of the EDR-DOS kernel, text/html 2024-07-29T19:29:46+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0729_mid_to_late_july_work?rev=1722274186&do=diff Mid to late July work 2024-07-28 The last two weeks I improved ident86 and used it to identicalise the Enhanced DR-DOS drdos module (ported to JWasm) as well as a new port of MSDebug to NASM. This new port re-used the fixmem.pl script from the WarpLink port to NASM. text/html 2024-08-27T19:19:30+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0827_mid_late_august_work?rev=1724779170&do=diff Mid late August work 2024-08-25 lDebug Bernd Böckmann requested a build of lDebug that can be booted on a machine with 256 KiB of low memory. I prepared smalll.sys, which can boot with as little as 192 KiB and leaves 86 KiB resident. This required a few changes: * Fix build with _EXTHELP=0 * Fix build with _EXTENSIONS=0 Unrelated changes: * Update copyright year in debug.asm, msg.asm, uu.asm, the online help page ?L, and the manual lDOS boot (experimental) text/html 2024-09-22T17:53:41+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0922_mid_september_work_on_fixupp_instsect_and_ldebug?rev=1727020421&do=diff Mid September work on fixupp, instsect, and lDebug 2024-09-22 This week some interesting developments occurred. fixupp This tool is a re-implementation of the ltools/fixupp.exe that was included in the OpenDOS 7.01 Machine Readable Sources package, as that was provided without sources. It operated on RASM-86 output object files to make them compatible with the object files assembled by JWasm. The exact purpose perpetually escapes me. text/html 2024-11-11T19:03:21+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/1111_early_november_work?rev=1731348201&do=diff Early November work 2024-11-10 This week some work happened on Enhanced DR-DOS, lDebug, MSDebug, and MS-DOS. I was also involved in commenting on several stackoverflow questions. stackoverflow MS-DOS Debug misbehaves when writing to 1000h:0 A user attempted to assemble some code at 1000h:0 using the command text/html 2024-10-28T20:47:13+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/1028_mid_to_late_october_work?rev=1730144833&do=diff Mid to late October work I didn't get around to writing a blog post last week, so this one covers two weeks' worth of work. 2024-10-27 Instruction set reference Fixed insSTOSB stating that it "sets the flags accordingly". Also add to other string instructions that flags are not modified (ins, lods, movs, outs). text/html 2024-06-30T17:33:11+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0630_mid_to_late_june_work?rev=1719761591&do=diff Mid to late June work 2024-06-30 The last three weeks included a vacation time for me. I didn't do a lot of work during these two weeks. TracList An initial revision of the convedr.pl script. This only handles RASM-86 output files correctly so far, combined with WarpLink map files. After text/html 2024-06-12T21:47:10+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0612_early_june_work?rev=1718221630&do=diff Early June work 2024-06-09 lDebug The load_unit_flags equates are moved into iniload.mac, and a data link is added for load_unit_flags. The chstool Extension for lDebug will now use these flags. instsect Add flag _LBA_WORKAROUND to the LBA detection search strings. Not yet uploaded: Detect doubles in the LBA search strings, and eventually avoid writing them. text/html 2024-04-02T19:39:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0402_late_march_work?rev=1712079596&do=diff Late March work 2024-03-31 lDebug * Do not use AX in LINKCALL ELD * Fix builds without history or with history in the data/entry segment * Fix, do not parse opening paren of linear address as part of the expression * Documentation updates EDR-DOS * Pick SvarDOS kernel patches since January * compbios, compbdos: Port to ia16 gcc with libi86 by using a far buffer for input ( text/html 2024-07-08T19:03:50+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0708_early_july_work?rev=1720458230&do=diff Early July work 2024-07-07 Enhanced DR-DOS * Add listing file output for dosgrps.asm * Fix: LFN search calling the redirector should not expect FAT+ size bits in the DTA * Fix: Address all new LFN variables using the BDOS_DATA segment instead of a mix TracList * convedr.pl: * extract function to process .rel file * allow lack of initial blank before offset of machine code dump * allow specifying explicit .rel files * subtract group base from segmented section address in … text/html 2024-05-12T20:31:02+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0512_early_mid_may_work?rev=1715538662&do=diff Early mid May work 2024-05-12 wwwecm scripts Added msdos4 build. Added kernwrap as a dependency for edrdos and msdos4 builds. MSDebug Added the function checkend to the assembler, reject most cases of trailing garbage after the last accepted operand. Some cases remain, eg in, out, shifts and rotates. But many cases like mul, mov, xchg, push, and pop no longer accept trailing garbage. text/html 2024-08-20T19:41:44+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0820_mid_august_work_not_much?rev=1724175704&do=diff Mid August work (not much) 2024-08-18 fixmem * Call addequate for section or group names listed in WRT clauses, and add section or group name to the equates structures Enhanced DR-DOS Finished port of drbio to NASM. ident86 * Add -f switch to change or increase default fuzzy compare equal delta limit (from default 32) text/html 2024-01-29T18:08:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0129_late_january_work?rev=1706548136&do=diff Late January work 2024-01-28 Here's this week's work. lDebug dpb.eld * Add ADDRESS mode to specify address to read DPB from instead of a drive * Add EXTENDED= mode with FREEDOS, MSDOS, and EDRDOS keywords to select format * Add ONLY keyword to skip base DPB * Add LIST SKIP number and LIST DRIVE drive modes to use DPB pointer chain from the DOS List of Lists text/html 2024-12-11T14:30:36+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/1211_early_december_work?rev=1733923836&do=diff Early December work 2024-12-08 Today marks the 100th blog post that I wrote on the HP 95LX. It also is likely to be the last post in December due to the café closing for a few weeks starting tomorrow. lDebug The lDebug repo got updated some. * text/html 2024-04-08T19:51:40+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0408_ldebug_work_in_early_april?rev=1712598700&do=diff lDebug work in early April 2024-04-07 Updates to the manual Only listing the most important changesets: * List INSTALL TOGGLE * List more INSTALL nouns (1, 2, 3) * Document L and W commands for sectors * Update vardco with 7th variables Code changes * init and qq will disable interrupts while relocating EBDA * bb: Many comments added and updated text/html 2024-03-03T17:09:54+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0303_mid_late_february_work?rev=1709482194&do=diff Mid late February work 2024-02-25 This week some development on lmacros, instsect, lDebug, and EDR-DOS and FreeDOS happened. lmacros Add the fill_at_least macros to avoid an overflow in the debugger letting the entire build fail. Instead, the field will be filled if its content is shorter, but allowed to assemble as well if the content is as long as or longer than the fill length. text/html 2024-11-04T18:13:29+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/1104_october_november_work_on_porting_the_ms-dos_v4.01_kernel?rev=1730740409&do=diff October November work on porting the MS-DOS v4.01 kernel 2024-11-03 Today I finally uploaded the first steps toward porting the free software MS-DOS kernel (released on 2024 April 26) to build with NASM and WarpLink (and x2b2 and round and convlist.pl). So far only one file has been ported. text/html 2024-03-03T17:22:46+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0303_late_february_work?rev=1709482966&do=diff Late February work 2024-03-03 This week some development happened on lDebug, inicomp, and ldosboot. (At the time of this writing, the prior blog post still isn't released. Oh well.) The SvarDOS repo for Enhanced DR-DOS had some discussion about compression formats. lDebug * Work around old Exomizer incorrectly checking its -P switch, by doubling it text/html 2024-07-01T19:47:03+00:00 Anonymous (anonymous@undisclosed.example.com) https://pushbx.org/ecm/dokuwiki/blog/pushbx/2024/0701_support_of_segment_overrides_for_xlatb?rev=1719856023&do=diff Support of segment overrides for XLATB Copied from a mail sent to freedos-devel: On at 2024-06-30 23:04 +0200, Bernd Böckmann via Freedos-devel wrote: " Hello, I have a question our assembly people: I stumbled upon an unusual instruction in the EDR-DOS source [1]. In RASM86 this is expressed as