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- May 24, 1980
-
- To Whom it may concern:
-
- This disk contains a recently developed BIOS and support routines
- for CP/M (Copyright Digital Research). The BIOS was developed from rou-
- tines retrieved from the CPMUG, Tarbell Electronics, DR's CP/M 2.0 and
- J. S. Singer. It is meant to operate as a full blown BIOS under CP/M 2.0.
- In particular, it was developed to give the full disk capabilities that
- CP/M 2.0 and DFOCO, a disk utility by S. J. Singer, provide. It supports
- single and double density disks with 128, 256, 512 or 1024 sector sizes.
- The non-disk drivers fully support the virtual re-assignments allowed via
- the IOBYTE. Also, special utilities are provided to give the user quick
- access to the new functions being supported.
-
- The BIOS may be as large as 2.75k. Currently, it is limited to
- .75k by the way its stored on the diskette. To provide more room, I put
- the CCP on the disk as a regular disk file. For warm or cold starts, I
- merely open it as a regular file and read it in. Unfortunately, this
- takes more time than I really like due to required system overhead (I.E.
- System Reset, Disk Select, etc.). In the future, I plan to change it so
- that 3 tracks are used for system tracks instead of two.
-
- To generate the system, follow the instructions given in the BIOS.
- You will use files, 21BIOS.ASM and 21BOOT.ASM. The system generation is
- almost the same as if you were doing it for any old CP/M. To regenerate
- the system under itself, you MUST use the NPGEN.ASM file instead of SYSGEN
- and 21BOOT.ASM. These instructions can be found in the front of NPGEN.ASM.
- Please insure that you are familiar with system generations before tackling
- this one. Also, always keep a backup of your old system. This thing can
- become tricky!
-
- I look forward to any constructive comments and suggestions.
-
- Respectfully,
-
- Robert M. White
- H & W Computer Systems, Inc.
- 8530 Stonehaven
- Boise, ID 83704
- (208) 377-0336
-
-
- W-A-R-N-I-N-G
-
- 1. It may seem that some the files on this tape are repeats of old ones.
- Be advised that ALL files have been updated. That is, they are dif-
- ferent from the old ones. Please don't try to interchange them.
-
- 2. System generations may be hazardous to the health of your current sys-
- tem if you don't back it up. Always do so! Also, generate the new
- system 16k smaller than your current one. Then to check out problems
- with DDT, you can re-boot your current system and look at the new BIOS's
- areas.
-
- 3. All programs on this disk require MAC, the macro assembler distributed
- by Digital Research.
-