diff options
Diffstat (limited to 'src/mess/machine/victor9k_fdc.c')
-rw-r--r-- | src/mess/machine/victor9k_fdc.c | 74 |
1 files changed, 46 insertions, 28 deletions
diff --git a/src/mess/machine/victor9k_fdc.c b/src/mess/machine/victor9k_fdc.c index 9d16f9ca244..d7af9928498 100644 --- a/src/mess/machine/victor9k_fdc.c +++ b/src/mess/machine/victor9k_fdc.c @@ -11,9 +11,25 @@ /* + value error description + + 01 no sync pulse detected + 02 no header track + 03 checksum error in header + 04 not right track + 05 not right sector + 06 not a data block + 07 data checksum error + 08 sync too long + 99 not a system disc + +*/ + +/* + TODO: - - disk error 2 (cannot find block header?) + - communication error with SCP after loading boot sector - 8048 spindle speed control - read PLL - write logic @@ -37,6 +53,8 @@ #define M6522_5_TAG "1k" #define M6522_6_TAG "1h" +#define GCR_DECODE(_e, _i) \ + ((BIT(_e, 6) << 7) | (BIT(_i, 7) << 6) | (_e & 0x33) | (BIT(_e, 2) << 3) | (_i & 0x04)) //************************************************************************** @@ -209,8 +227,6 @@ victor_9000_fdc_t::victor_9000_fdc_t(const machine_config &mconfig, const char * m_via4_irq(CLEAR_LINE), m_via5_irq(CLEAR_LINE), m_via6_irq(CLEAR_LINE), - m_syn(0), - m_lbrdy(1), m_period(attotime::from_nsec(2130)) { cur_live.tm = attotime::never; @@ -259,8 +275,6 @@ void victor_9000_fdc_t::device_start() save_item(NAME(m_via4_irq)); save_item(NAME(m_via5_irq)); save_item(NAME(m_via6_irq)); - save_item(NAME(m_syn)); - save_item(NAME(m_lbrdy)); } @@ -630,10 +644,7 @@ READ8_MEMBER( victor_9000_fdc_t::via5_pa_r ) */ - UINT8 e = checkpoint_live.e; - UINT8 i = checkpoint_live.i; - - return BIT(e, 6) << 7 | BIT(i, 7) << 6 | BIT(e, 5) << 5 | BIT(e, 4) << 4 | BIT(e, 2) << 3 | BIT(i, 1) << 2 | (e & 0x03); + return GCR_DECODE(checkpoint_live.e, checkpoint_live.i); } WRITE8_MEMBER( victor_9000_fdc_t::via5_pb_w ) @@ -886,10 +897,9 @@ READ8_MEMBER( victor_9000_fdc_t::cs7_r ) { live_sync(); cur_live.lbrdy = 1; - if (LOG_VIA) logerror("%s %s LBRDY 1\n", machine().time().as_string(), machine().describe_context()); - m_lbrdy_cb(1); - checkpoint(); - live_run(); + cur_live.lbrdy_changed = true; + if (LOG_VIA) logerror("%s %s LBRDY 1 : %02x\n", machine().time().as_string(), machine().describe_context(), m_via5->read(space, offset)); + live_delay(RUNNING_SYNCPOINT); } return m_via5->read(space, offset); @@ -901,10 +911,9 @@ WRITE8_MEMBER( victor_9000_fdc_t::cs7_w ) { live_sync(); cur_live.lbrdy = 1; + cur_live.lbrdy_changed = true; if (LOG_VIA) logerror("%s %s LBRDY 1\n", machine().time().as_string(), machine().describe_context()); - m_lbrdy_cb(1); - checkpoint(); - live_run(); + live_delay(RUNNING_SYNCPOINT); } m_via5->write(space, offset, data); @@ -1045,8 +1054,10 @@ void victor_9000_fdc_t::live_abort() cur_live.brdy = 1; cur_live.lbrdy = 1; + cur_live.lbrdy_changed = true; cur_live.sync = 1; cur_live.syn = 1; + cur_live.syn_changed = true; cur_live.gcr_err = 1; } @@ -1088,7 +1099,7 @@ void victor_9000_fdc_t::live_run(const attotime &limit) // sync counter if (sync) { cur_live.sync_bit_counter = 0; - cur_live.sync_byte_counter = 10; + cur_live.sync_byte_counter = 9; } else if (!cur_live.sync) { cur_live.sync_bit_counter++; if (cur_live.sync_bit_counter == 10) { @@ -1103,8 +1114,6 @@ void victor_9000_fdc_t::live_run(const attotime &limit) // syn int syn = !(cur_live.sync_byte_counter == 15); - if (LOG) logerror("%s bit %u sync %u bc %u sbc %u sBC %u syn %u\n",cur_live.tm.as_string(),bit,sync,cur_live.bit_counter,cur_live.sync_bit_counter,cur_live.sync_byte_counter,syn); - // GCR decoder if (cur_live.drw) { cur_live.i = cur_live.drw << 10 | cur_live.shift_reg; @@ -1114,6 +1123,8 @@ void victor_9000_fdc_t::live_run(const attotime &limit) cur_live.e = m_gcr_rom->base()[cur_live.i]; + if (LOG) logerror("%s bit %u sync %u bc %u sbc %u sBC %u syn %u i %03x e %02x\n",cur_live.tm.as_string(),bit,sync,cur_live.bit_counter,cur_live.sync_bit_counter,cur_live.sync_byte_counter,syn,cur_live.i,cur_live.e); + // byte ready int brdy = !(cur_live.bit_counter == 9); @@ -1122,16 +1133,13 @@ void victor_9000_fdc_t::live_run(const attotime &limit) if (brdy != cur_live.brdy) { if (LOG) logerror("%s BRDY %u\n", cur_live.tm.as_string(),brdy); - if (LOG && !brdy) + if (!brdy) { - UINT8 e = cur_live.e; - UINT8 i = cur_live.i; - - UINT8 data = BIT(e, 6) << 7 | BIT(i, 7) << 6 | BIT(e, 5) << 5 | BIT(e, 4) << 4 | BIT(e, 2) << 3 | BIT(i, 1) << 2 | (e & 0x03); - logerror("%s BRDY %02x\n",cur_live.tm.as_string(),data); + cur_live.lbrdy = 0; + cur_live.lbrdy_changed = true; + if (LOG_VIA) logerror("%s LBRDY 0 : %02x\n", cur_live.tm.as_string(), GCR_DECODE(cur_live.e, cur_live.i)); } cur_live.brdy = brdy; - if (!brdy) cur_live.lbrdy = 0; syncpoint = true; } @@ -1144,6 +1152,7 @@ void victor_9000_fdc_t::live_run(const attotime &limit) if (syn != cur_live.syn) { if (LOG) logerror("%s SYN %u\n", cur_live.tm.as_string(),syn); cur_live.syn = syn; + cur_live.syn_changed = true; syncpoint = true; } @@ -1166,8 +1175,17 @@ void victor_9000_fdc_t::live_run(const attotime &limit) } case RUNNING_SYNCPOINT: { - m_lbrdy_cb(cur_live.lbrdy); - m_syn_cb(cur_live.syn); + if (cur_live.lbrdy_changed) { + m_lbrdy_cb(cur_live.lbrdy); + cur_live.lbrdy_changed = false; + } + + if (cur_live.syn_changed) { + m_syn_cb(cur_live.syn); + cur_live.syn_changed = false; + } + + m_via5->write_ca1(cur_live.brdy); cur_live.state = RUNNING; checkpoint(); |