pushbx wiki

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====== 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 =====

[[https://hg.pushbx.org/ecm/insref/rev/0049d9068a70|Fixed insSTOSB stating that it "sets the flags accordingly"]]. Also add to other string instructions that flags are not modified (ins, lods, movs, outs).


===== lDOS boot =====

  * [[https://hg.pushbx.org/ecm/ldosboot/rev/0e3f8cc013a0|Add section on FSIBOOT]] to the documentation
  * [[https://hg.pushbx.org/ecm/ldosboot/rev/d0f336f6ac05|Add sections on ROM-BIOS and MBR to sector]] to the docs
  * [[https://hg.pushbx.org/ecm/ldosboot/rev/f4e0d0ad0612|Fix newly added hyperlinks]] in docs
  * [[https://hg.pushbx.org/ecm/ldosboot/rev/45ff3831edd5|Mention patchqry]]
  * In iniload lDOS entry [[https://hg.pushbx.org/ecm/ldosboot/rev/efdfdbf93f95|check for lsvLoadSeg underflow]]
  * [[https://hg.pushbx.org/ecm/ldosboot/rev/0a8f90c39839|Update attribution year]] of iniload.asm
  * [[https://hg.pushbx.org/ecm/ldosboot/rev/e8135bddf252|Update iniload.asm comments]] listing known lDOS signatures
  * [[https://hg.pushbx.org/ecm/ldosboot/rev/c41773c20225|List lDXX (unset) signature]] in iniload.asm and documentation


===== lDebug =====

[[https://hg.pushbx.org/ecm/ldebug/rev/e19b672622be|Update dbitmap Extension for lDebug]] to add STR mode. This allows to display a string using the embedded font.

The STR mode patch includes the \M escape code which causes the next byte to be mirrored.

In a separate revision [[https://hg.pushbx.org/ecm/ldebug/rev/49c7d7ea4ce3|the \H escape code is added]] which takes an alphanumeric byte and displays a blank of the corresponding width, mainly for ''\H4'' to display a half-width space.

(Backslashes to be displayed must be escaped as double backslashes.)

Here's a fun script to try with the updated ELD, logo.sld:

<code>@?version
@ext printf.eld "\r\n"
@ext dbitmap.eld run set1 '#' end set0 ' ' end str "\MLDebug"
@ext printf.eld "\t   Presented by BTTR Software\r\n"</code>

(The reverse capital L is an acceptable way of rendering the first letter of "lDebug" or "lDOS".)


===== Enhanced DR-DOS =====

Pick two changes from SvarDOS:

  * [[https://hg.pushbx.org/ecm/edrdos/rev/820c1299fa5c|Re-test buffer dirty status after recursive buffer flush]], to address [[https://github.com/SvarDOS/edrdos/issues/120|an error during cross-drive copying]]
  * [[https://hg.pushbx.org/ecm/edrdos/rev/243525ce79db|Prefer discarded buffer]] when searching a buffer for new data (performance optimisation)

Further, [[https://hg.pushbx.org/ecm/edrdos/rev/92e280052d42|the lDOS version string got updated]] to 2024 October.


===== fixmem =====

  * nasm.mac: [[https://hg.pushbx.org/ecm/fixmem/rev/d8da6c3c02c4|cap-insensitively define labelsize labels and ret in proc]]
  * [[https://hg.pushbx.org/ecm/fixmem/rev/918e281a5dc6|replace %out directives]] by %warning
  * [[https://hg.pushbx.org/ecm/fixmem/rev/bb5746a5aca6|ignore .xcref, .cref, name directives, and handle .xlist]]
  * [[https://hg.pushbx.org/ecm/fixmem/rev/2c662df245e9|add support for I_AM and I_NEED macros]] used by MS-DOS v4 kernel sources
  * detect comment that [[https://hg.pushbx.org/ecm/fixmem/rev/54d6fb07091f|indicates NASM original macros to skip remainder of a file]]
  * nasm.mac: [[https://hg.pushbx.org/ecm/fixmem/rev/bbc415e7c4c0|insert NASM original macros comment]]
  * [[https://hg.pushbx.org/ecm/fixmem/rev/a3e819139fbd|allow SIZE operator to specify differently-capitalised name]] of a structure
  * [[https://hg.pushbx.org/ecm/fixmem/rev/90f95446fb48|switch ENDS to define a _struc_size suffixed label]] rather than _size, as _size sometimes clashed



{{tag>insref ldosboot ldebug eld logo edrdos fixmem}}


~~DISCUSSION~~