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| author |  Mark Zbikowski | 2024-04-25 21:24:10 +0100 |
|---|---|---|
| committer |  Microsoft Open Source | 2024-04-25 22:32:27 +0000 |
| commit | 2d04cacc5322951f187bb17e017c12920ac8ebe2 (patch) | |
| tree | 80ee017efa878dfd5344b44249e6a241f2a7f6e2 /v4.0-ozzie/bin/DISK1/README | |
| parent | Merge pull request #430 from jpbaltazar/typoptbr (diff) | |
| download | ms-dos-main.tar.gz ms-dos-main.tar.xz ms-dos-main.zip | |
Diffstat (limited to 'v4.0-ozzie/bin/DISK1/README')
| -rw-r--r-- | v4.0-ozzie/bin/DISK1/README | 67 |
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| 7 | Multi-Taking MS-DOS | ||
| 8 | Beta Test Release 1.00 | ||
| 9 | |||
| 10 | Release Notes | ||
| 11 | |||
| 12 | |||
| 13 | Enclosed you will find Microsoft's first beta release | ||
| 14 | of Multi-tasking MS-DOS. This version is based upon MS-DOS | ||
| 15 | Version 2 sources, we will be reimplementing the multi- | ||
| 16 | tasking enhancements on top of Version 3 sources shortly. | ||
| 17 | |||
| 18 | Although we have distributed a bootable disk for the | ||
| 19 | IBM PC, this package can be adapted to any MS-DOS machine. | ||
| 20 | Those manufacturers who are designing IBM compatible ROMs, | ||
| 21 | would be wise to keep multi-tasking in mind. Specifically, | ||
| 22 | this IBM PC implementation has had to hook out the entire | ||
| 23 | disk (both floppy and hard disk) ROM code because after he | ||
| 24 | IBM code set's up the DMA transfer it simply loops in ROM | ||
| 25 | waiting for the interrupt to occur (routine WAIT_INT). | ||
| 26 | |||
| 27 | Problems you may wish to avoid within future ROMs are: | ||
| 28 | 1) loading ES with the physical video RAM location | ||
| 29 | (label M3) | ||
| 30 | 2) Looping in ROM on Cntrl-NumLock (label K40) | ||
| 31 | 3) No way to add special detecting special key | ||
| 32 | strokes which a jump out into RAM after reading | ||
| 33 | the keystroke at KB_INT would avoid | ||
| 34 | 4) Not being able to hook the loading of DS to point | ||
| 35 | to DATA (EQU 40H) in numerous routines. | ||
| 36 | Other than these deficiencies the ROM code developed should | ||
| 37 | be very usable. | ||
| 38 | |||
| 39 | By implementing the above suggestions, the size of your | ||
| 40 | BIOS can be reduced since it will not be necessary to | ||
| 41 | duplicate functionality in RAM. | ||
| 42 | |||
| 43 | More detailed specifications of the device driver | ||
| 44 | formats will be forth coming. For the time being you will | ||
| 45 | have to make use of the sample source code for the IBM PC. | ||
| 46 | If you have further questions please contact Microsoft OEM | ||
| 47 | customer support through Technical Assist Requests (TAR). | ||
| 48 | |||
| 49 | |||
| 50 | * * * WARNING * * * WARNING * * * WARNING * * * | ||
| 51 | |||
| 52 | Each copy of this software distribution has been | ||
| 53 | individually serialized to facilitate tracing of | ||
| 54 | unauthorized duplication. | ||
| 55 | |||
| 56 | * * * WARNING * * * WARNING * * * WARNING * * * | ||
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| 67 | \ No newline at end of file | ||