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Limit Xosera config to 2 UARTS; set $A0 base addr.

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The consenus is that the best default address for Xosera
is $A0, so make that the default.

However, in that case we need to limit the number of UARTs
that are probed to two because the probe for a third UART
writes unlucky values to Xosera (at $A3) and causes it to
reconfigure itself and lock up the bus for a time.

Thanks to Wayne for his help in debugging this.
This commit is contained in:
Rob Gowin
2025-06-06 11:32:15 -04:00
parent a9c7be6744
commit ba5af175ba
1 changed files with 10 additions and 3 deletions
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13
Source/HBIOS/Config/RCZ80_xosera.asm
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@@ -41,14 +41,21 @@
; ".SET" TO OVERRIDE SETTINGS. THE ASSEMBLER WILL ERROR IF YOU ATTEMPT
; TO USE ".EQU" BECAUSE IT WON'T LET YOU REDEFINE A SETTING WITH ".EQU".
;
; THIS FILE ENABLES THE XOSERA DRIVER WITH A BASE ADDRESS Of 0XE0
; AND DISPLAY SIZE OF 80 COLUMNS X 30 ROWS
; THIS FILE ENABLES THE XOSERA DRIVER WITH A BASE ADDRESS Of $A0 AND
; DISPLAY SIZE OF 80 COLUMNS X 30 ROWS.
;
#INCLUDE "Config/RCZ80_std.asm" ; INHERIT FROM OFFICIAL BUILD SETTINGS
;
XOSENABLE .SET TRUE ; XOSERA: ENABLE XOSERA VIDEO DRIVERS (XOSERA.ASM)
XOS_BASE .SET $20 ; XOSERA: I/O BASE ADDRESS (REQUIRES 32 BYTES)
XOS_BASE .SET $A0 ; XOSERA: I/O BASE ADDRESS (REQUIRES 32 BYTES)
XOSSIZ .SET V80X30 ; XOSERA: DISPLAY FORMAT [V80X30|V80X60]
;
AUTOCON .SET FALSE ; ENABLE CONSOLE TAKEOVER AT LOADER PROMPT
VDAEMU_SERKBD .SET $0 ; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
;
; WHEN A XOSERA BOARD IN IS THE SYSTEM, LIMIT THE NUMBER OF UARTS THAT ARE PROBED
; TO TWO, BECAUSE THE PROBE TO DETECT A THIRD UART WRITES UNLUCKY VALUES TO
; XOSERA THAT CAUSE IT TO RECONFIGURE ITSELF AND LOCK UP THE BUS FOR A TIME. IF
; YOU NEED MORE THAN TWO UARTS, YOU WILL NEED TO MOVE XOSERA OUT OF THE $A0-$BF
; I/O ADDRESS REGION.
UARTCNT .SET 2