Difference between revisions of "DkTronics CPM"

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(Technical)
(Technical)
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=== Technical ===
 
=== Technical ===
  
* 61K TPA is now active until NEWCPM.COM is run.
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* 61K TPA is not active until NEWCPM.COM is run.
* 61K CPM is stored in "NEWCPM.SYS".
+
* 61K CPM is stored in "NEWCPM.SYS" and is loaded by NEWCPM.COM
* NEWCPM.COM loads NEWCPM.SYS.
+
 
* 7FC1/7FC2 is used.
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====NEWCPM.COM====
 +
* NEWCPM.COM is a normal COM file. It is loaded like a normal COM file. It resides in memory in bank 0 but configures a 61K CPM in bank 1 and transfers control to it. It remains in bank 0 and implements parts of the 61K CPM BIOS.
 +
* NEWCPM.COM sets up a BIOS jumpblock in page C7 at FC00. This calls into the resident NEWCPM.COM code in bank 0
 +
* NEWCPM.SYS is first loaded to B00 in bank 0, it is later copied into bank 1 to it's correct location.
 +
 
 +
TPA upper address is &F300. BIOS jump is at FC00. Code after FC00 is part of the BIOS in bank 1.
  
 
== Downloads ==
 
== Downloads ==
  
 
* [[File:Dkcpm.dsk CPM2.2 configured for 61K TPA]]
 
* [[File:Dkcpm.dsk CPM2.2 configured for 61K TPA]]

Revision as of 05:03, 20 May 2018

CPM+

CPM2.2

Creating the DkTronics 61K TPA CPM 2.2

Boot into CPM2.2 from system discs:

A>disckit2

Use disckit2 to format a vendor disc. This will become 'Dk'Tonics CPM Disk'.

A>BOOTGEN Source is: CPM 2.2 disk Now insert 'Dk'tronics CPM Disk'.

This initialises the boot sector.

A>SYSGEN Source is CPM2.2 disk Destination is 'Dk'Tronics CPM Disk'

This puts CPM2.2 onto the disc.

A>FILECOPY movcpm.com Source is 'CPM 2.2 system disc' disk. Destination is 'Dk'Tronics CPM Disk' disk.

This puts movcpm.com onto the disk.

A>FILECOPY save.com Source is 'CPM 2.2 system disc' disk. Destination is 'Dk'Tronics CPM Disk' disk.

This puts save.com onto the disk.

A>FILECOPY newcpm.com Source is 'Dk'Tronics bank switch software' disk. Destination is 'Dk'Tronics CPM Disk' disk.

This transfers Dk'Tronics newcpm.com.

A>FILECOPY oldcpm.com Source is 'Dk'Tronics bank switch software' disk. Destination is 'Dk'Tronics CPM Disk' disk.

This transfers Dk'Tronics oldcpm.com.

Now boot the Dk'Tronics CPM Disk.

A>MOVCPM 255 *

This configures a 63K CPM.

A>SAVE 34 NEWCPM.SYS

This saves a 63K CPM for Dk'Tronics CPM to use.

Your Dk'Tronics CPM is setup.

Technical

  • 61K TPA is not active until NEWCPM.COM is run.
  • 61K CPM is stored in "NEWCPM.SYS" and is loaded by NEWCPM.COM

NEWCPM.COM

  • NEWCPM.COM is a normal COM file. It is loaded like a normal COM file. It resides in memory in bank 0 but configures a 61K CPM in bank 1 and transfers control to it. It remains in bank 0 and implements parts of the 61K CPM BIOS.
  • NEWCPM.COM sets up a BIOS jumpblock in page C7 at FC00. This calls into the resident NEWCPM.COM code in bank 0
  • NEWCPM.SYS is first loaded to B00 in bank 0, it is later copied into bank 1 to it's correct location.

TPA upper address is &F300. BIOS jump is at FC00. Code after FC00 is part of the BIOS in bank 1.

Downloads