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nvram/mc146818 : after a reset, VRT bit should always be set in reg D

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VRT bit was previously reset during a cold boot, which caused TOS to not
used the stored date/time in the RTC part of the chip
This commit is contained in:
Nicolas Pomarède committed 2026-10-17 12:49:29 +02:00
1 parent 92e05730a8
commit 6c80daaf18
1 file changed
+6 -4
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src/falcon/nvram.c
+6 -4
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@@ -141,7 +141,9 @@ const char NvRam_fileid[] = "Hatari nvram.c";
// Defs for NVRAM status register D (13) bits (read only)
// bits 0-6 are always 0
#define REG_BIT_VRT 0x80 /* valid RAM and time */
#define REG_BIT_VRT 0x80 /* valid RAM and time : depends on the Power Sense (PS) pin */
/* which reports the state of the external battery used */
/* to power the MC146818A when the TT/Falcon is powered off */
#define MC146818_IRQ_ON 0 /* O/low sets IRQ line */
@@ -416,6 +418,9 @@ void NvRam_Reset ( bool bCold)
/* clear all interrupt flags */
nvram[0x0c] &= ~(REG_BIT_UF|REG_BIT_AF|REG_BIT_PF|REG_BIT_IRQF);
/* VRT bit is always set in Hatari to simulate a working external battery */
nvram[0x0d] |= REG_BIT_VRT;
MC146818_Set_Line_IRQ ( MC146818_IRQ_OFF ); /* IRQ line goes high */
nvram_index = 0;
@@ -477,7 +482,6 @@ void NvRam_Init ( void )
const char sBaseName[] = "hatari.nvram";
const char *psHomeDir;
// set up the nvram filename
psHomeDir = Paths_GetHatariHome();
if (strlen(psHomeDir)+sizeof(sBaseName)+1 < sizeof(nvram_filename))
@@ -559,8 +563,6 @@ static void NvRam_Clock_Init ( void )
nvram[8] = bin2BCD(getHostLocalTime()->tm_mon + 1);
nvram[9] = bin2BCD(getHostLocalTime()->tm_year - year_offset);
nvram[0x0d] |= REG_BIT_VRT;
//fprintf ( stderr , "nvram clock init : %02d-%02d-%02d %d %02d:%02d:%02d\n" ,BCD2bin(nvram[9]),BCD2bin(nvram[8]),BCD2bin(nvram[7]),BCD2bin(nvram[6]),BCD2bin(nvram[4]&0x7f),BCD2bin(nvram[2]),BCD2bin(nvram[0]) );
}