Previously working system suddenly can't boot from any floppy (RDOS 03.08 Error-R 80 > Drive not Ready

[riwide]

Does anyone know what might give rise to this error (Drive not ready)? :
Cromemco RDOS 03.08
;b
Bank 0 > 0 1 2 3 4 5 6 7 8 9 A B C D E F
^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ X X ^ ^
Preparing to boot, ESC to abort

0 00 01
Error-R 80 > Drive not Ready

Unable to boot

Cromemco RDOS 03.08
;

My system was happy to boot from floppy for all of cpm, cdos and cromix. I started to play around with hd prep according to THN#037, then took sdcard out to make some file management in PC. On putting sdcard back in , powering up etc I cannot boot from floppy.
I put a new (latest March 2023) disk image on a different sd card, prepped the config and still get same error.
The SD file system clearly works because edit of boot.conf saves ok, and manipulation of lib with drag and drop to save a file add new file is OK.

the log shows:
Release 1.38-dev, Copyright (C) 1987-2022 by Udo Munk
ESP32 Cromemco Z-1 Simulation Release 1.19 (ESP32)
Copyright (C) 2008-2022 by Udo Munk & David McNaughton

CPU speed is 4 MHz, CPU executes undocumented instructions

RAM 0000H - FFFFH
ROM C000H - DFFFH rdos0308.hex
Power-on jump address at C000H
MMU has 7 additional RAM banks of 64 KB

FDC Banked ROM enabled

DISK MAP: [/sdcard/cromemco/disks/disk.map]
A:DSK:='cdos258-WRK.dsk'

Loader statistics for file /sdcard/cromemco/roms/rdos0308.hex:
START : C000H
END : DFFFH
LOADED: 2000H (8192)

telnet console listening on port 4010
telnet console listening on port 4011
MODEM.init string: ATS0=1S15=1&A1

TU-ART DEVICE MAP:
TUART0.deviceA = WEBTTY MODEM UART0
TUART1.deviceA = WEBTTY2 SCKTSRV1 UART1
TUART1.deviceB = WEBTTY3 SCKTSRV2 UART2

HARD DISK MAP: [/sdcard/cromemco/disks]
HD0: OFFLINE - NO FILE 'hd0.hdd'
HD1: OFFLINE - NO FILE 'hd1.hdd'
HD2: OFFLINE - NO FILE 'hd2.hdd'

[riwide]

I'm going to answer my own question - I think I must have accidentally altered the switches, not realising they would be important after locking them into NVR. I will pretend it was one of the cats that disturbed them. I can boot into CDOS now.