Add RC2014 CP/M-IDE diskdef defaults.

[feilipu]

Adding the diskdef defaults from CP/M-IDE.

[geowar1]

This is what I use:

# Z280RC - partition A:
# Reserved track contains the boot loader, ZZMON, CP/M 2 image, CPMLDR
diskdef z280rc-a
  seclen 512
  tracks 63
  sectrk 256
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 1
  os 3
end

# Z280RC - partition B:
diskdef z280rc-b
  seclen 512
  tracks 63
  sectrk 256
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 0
  os 2.2
  offset 64trk
end

# Z280RC - partition C:
diskdef z280rc-c
  seclen 512
  tracks 63
  sectrk 256
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 0
  os 3
  offset 128trk
end

# Z280RC - partition D:
diskdef z280rc-d
  seclen 512
  tracks 63
  sectrk 256
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 0
  os 3
  offset 192trk
end

Biggest difference is maxdir of 512 vs. 2048… There's one boot track on drive A (zero otherwise) and an offset of 64 tracks per partition.

[geowar1]

This is the DPB for drive D: on the z280 rc2014 board.

Dumping Disk Parameter Block at 0xFF98

        128-byte sectors per track (SPT):       1024                    (0x0400)
        block shift (BSH):                      5                       (0x05)
        block mask (BLM):                       31                      (0x1F)
        extent mask (EXM):                      1                       (0x01)
        max block (DSM):                        2047                    (0x07FF)
        maximum directory entry (DRM):          511                     (0x01FF)
        alloc vector for directory (AL0,1):     1111000000000000        (0xF000)
        checksum size (CKS):                    32768                   (0x8000)
        offset for system tracks (OFF):         0                       (0x0000)
        physical sector size shift (PSH):       2                       (0x02)
        physical sector size mask (PSM):        00000011                (0x03)

logical Sectors Per Physical (SPP=PSM+1):       4                       (0x04)
Physical Sectors per Track (PST=SPT/SPP):       256                     (0x0100)
logical Sectors Per Block (SPB=BLM+1):          32                      (0x20)
Physical sectors Per Block (PPB=SPB/SPP):       8                       (0x08)
Blocks Per Drive (BPD=DSM+1):                   2048                    (0x0800)
Physical sectors Per Drive (PSD=BPD*PPB):       16384                   (0x4000)
Tracks per drive (TPD=PSD/PST+OFF):             64                      (0x0040)

[geowar1]

Are you using the Tony Nicholsons non-banked BIOS sources from 27-Jul-2018 or the banked version from 12-Nov-2018?
Mine are the newer banked version with support for partitions (I use a word after each DPB instead of messing with the OFF since that breaks DU & zap (disk utilities)).

[feilipu]

Are you using the Tony Nicholson's non-banked BIOS sources from 27-Jul-2018 or the banked version from 12-Nov-2018?

Neither. The BIOS for CP/M-IDE is almost purely DRI example code based, from their System Alteration Guide. Of course there are minor non-functional changes which improve performance, mainly making use of the additional Z80 instructions.

As CP/M-IDE is a ROM based CP/M all the drives are orthogonal, and there is no boot track required. There was quite a detailed discussion about sectrk and maxdir values on the RC2014 Group. Which lead to the values used here.

[geowar1]

Ah! My bad… my brain translated rc2014 to z280rc… two different beasts… I'll add the z280rc definitions via a different PR. Sorry for the noise. ;-)

[feilipu]

Bump! 👋

CP/M-IDE Repository for reference.

[feilipu]

Wave!👋

[feilipu]

Reminder, this PR is still open.

Added 8085 support in 2021. More here.