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IBM 5550: Add machine config for test mode

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* Added a machine config for the RNA test mode.
* Changed the keyboard reset sequence to work on the RNA test correctly.
* Reduced screen updates for text cursor.
This commit is contained in:
Akamaki
2026-02-23 01:58:58 +09:00
parent dad8edd32e
commit 658425b33e
3 changed files with 111 additions and 74 deletions
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2
src/include/86box/machine.h
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@@ -1522,7 +1522,7 @@ extern int machine_xt_compaq_deskpro_init(const machine_t *);
/* m_xt_ibm5550.c */
#ifdef EMU_DEVICE_H
extern const device_t ibm5550_vid_device;
extern const device_t ibm5550_device;
#endif
extern int machine_xt_ibm5550_init(const machine_t *);

179
src/machine/m_xt_ibm5550.c
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@@ -161,12 +161,12 @@ enum epoch_nvr_ADDR {
};
#ifndef RELEASE_BUILD
//#define ENABLE_EPOCH_LOG 1
// #define ENABLE_EPOCH_LOG 1
#endif
#ifdef ENABLE_EPOCH_LOG
#define ENABLE_EPOCH_DEBUGIO 1
// #define ENABLE_EPOCH_DEBUGKBD 1
// #define ENABLE_EPOCH_DEBUGIO 1
#define ENABLE_EPOCH_DEBUGKBD 1
int epoch_do_log = ENABLE_EPOCH_LOG;
static void
@@ -279,6 +279,8 @@ typedef struct epoch_t {
nvr_t nvr;
int nvrctrl;
int nvrdata;
int testmode;
} epoch_t;
@@ -1154,7 +1156,7 @@ epoch_poll(void *priv)
epoch->cursoron = 1;
break;
}
if (!(epoch->blink & (0x08 - 2))) /* force redrawing for cursor and blink attribute */
if (!(epoch->blink & (0x08 - 1))) /* force redrawing for cursor and blink attribute */
epoch->fullchange = 3;
}
epoch->blink++;
@@ -1429,15 +1431,21 @@ epoch_misc_in(uint16_t port, void *priv)
/*
I/O A0h R:
xxxx xxx1: Memory or parity error?
xxxx xx1x: Test switch (physical switch on the rear panel)
x1xx xxxx: Sense DREQ? (only used in diag test)
0xxx xxxx: Coprocessor installed?
*/
case 0xA0:
if(!epoch->parityenabled)
ret &= 0xfe;
else
ret = epoch->parityerror & 1;
ret = 0;
if (epoch->parityenabled)
ret |= epoch->parityerror & 1;
if (fpu_type == FPU_NONE)
ret |= 0x80;
for (int i = 0; i < 2; i++)
if (dma_get_drq(i))
ret |= 0x40;
if (epoch->testmode)
ret |= 0x02;
break;
case 0xA1: /* High address where memory error occured */
ret = epoch->parityerroraddr;
@@ -1549,15 +1557,16 @@ x1xx xxxx: Enable parity update (Disable this -> Write data -> Enable this -> Re
typedef struct epochkbd_t {
int want_irq;
int blocked;
uint8_t irq_state;
uint8_t pa;
uint8_t pb;
uint8_t clk_hold;
uint8_t key_waiting;
uint8_t kbd_reset_step;
uint8_t mouse_reset_step;
int8_t kbd_readdata_step;
int mouse_enabled;
int mouse_queue_num;
int kbc_resetstep;
uint8_t mouse_queue[4];
pc_timer_t send_delay_timer;
@@ -1572,22 +1581,33 @@ kbd_epoch_poll(void *priv)
{
epochkbd_t *kbd = (epochkbd_t *) priv;
timer_advance_u64(&kbd->send_delay_timer, 1000 * TIMER_USEC);
timer_advance_u64(&kbd->send_delay_timer, 250 * TIMER_USEC);
if (kbd->pb & 0x04) /* controller is sending something to keyboard */
return;
if (kbd->kbd_readdata_step < 16)
kbd->kbd_readdata_step++;
if (!(kbd->pb & 0x08)) /* keyboard interrupt is disabled */
return;
if (kbd->want_irq) {
kbd->want_irq = 0;
kbd->pa = kbd->key_waiting;
kbd->blocked = 1;
picint(EPOCH_IRQ3_BIT);
epoch_kbdlog("epochkbd: kbd_poll(): keyboard_xt : take IRQ\n");
if (kbd->want_irq && kbd->kbd_readdata_step >= 16) {
if (kbd->blocked) {
kbd->want_irq = 0;
kbd->irq_state = 1;
picint(EPOCH_IRQ3_BIT);
epoch_kbdlog("epochkbd: kbd_poll(): keyboard_xt : take IRQ\n");
} else {
kbd->pa = kbd->key_waiting;
kbd->kbd_readdata_step = -4;
kbd->blocked = 1;
}
}
if (kbd->irq_state && (kbd->pb & 0x01)) /* Trigger interrupt repeatedly (for RNA test) */
picint(EPOCH_IRQ3_BIT);
if (!kbd->blocked) {
if (kbd->mouse_queue_num > 0) {
kbd->mouse_queue_num--;
@@ -1641,6 +1661,21 @@ kbd_adddata_ex(uint16_t val)
kbd_epoch_adddata_process(val, kbd_epoch_adddata);
}
static void
kbd_epoch_softreset(void *priv)
{
epochkbd_t *kbd = (epochkbd_t *) priv;
key_queue_start = key_queue_end = 0;
kbd->kbd_readdata_step = 16;
kbd->want_irq = 0;
kbd->blocked = 0;
kbd->clk_hold = 0;
kbd->mouse_queue_num = 0;
kbd->blocked = 0;
kbd->irq_state = 0;
kbd->pa = 0;
picintc(EPOCH_IRQ3_BIT);
}
/*
I/O 61h W:
xxxx xxx1: ? (used by kbd interrupt in DOS)
@@ -1672,20 +1707,26 @@ kbd_write(uint16_t port, uint8_t val, void *priv)
new_clock = !(val & 0x04);
/* Trigger kbd reset after the clk line is reset to a high level */
if (kbd->clk_hold && new_clock) {
key_queue_start = key_queue_end = 0;
kbd->want_irq = 0;
kbd->blocked = 0;
kbd->kbd_reset_step = 0;
kbd->clk_hold = 0;
kbd->mouse_enabled = 0;
kbd->mouse_queue_num = 0;
kbd->mouse_enabled = 0;
kbd_epoch_softreset(kbd);
epoch_kbdlog("epochkbd: Starting keyboard reset sequence.\n");
/* IBM 5556 keyboards send three bytes of identification code in the reset sequence.
DOS K3.44 supports following IDs:
A5xx1x: ? (standard layout)
A6xx1x: AIUEO RPQ Keyboard
B1xx1x, B2xx1x: Type 3, 4 Keyboard (1972 JIS layout)
B5xx1x: ? (standard layout)
*/
kbd_epoch_adddata(0xA5);
kbd_epoch_adddata(0x00);
kbd_epoch_adddata(0x10);
}
} else if ((val & 0x18) == 0x18) {
new_clock = !(val & 0x04);
if (kbd->clk_hold && new_clock) {
kbd->mouse_reset_step = 0;
kbd_epoch_softreset(kbd);
epoch_kbdlog("epochkbd: Starting mouse reset sequence.\n");
kbd_epoch_adddata(0x00);
}
}
@@ -1706,8 +1747,8 @@ kbd_write(uint16_t port, uint8_t val, void *priv)
/* clear buffer */
kbd->pa = 0;
kbd->blocked = 0;
/* IRQ will be cleared by the software */
// picintc(EPOCH_IRQ3_BIT);
kbd->irq_state = 0;
picintc(EPOCH_IRQ3_BIT);
}
break;
@@ -1736,35 +1777,29 @@ kbd_read(uint16_t port, void *priv)
case 0x61: /* Keyboard Control Register (aka Port B) */
ret = kbd->pb & 0xf0; /* reset sense bit */
ret |= 0x0c; /* reset sense bit */
if (kbd->kbd_reset_step < 18) {
if (kbd->kbd_readdata_step < 16) {
ret &= 0xf3;
if (!!(kbd->kbd_reset_step & 1))
ret |= 0x04;
switch (kbd->kbd_reset_step >> 1) { /* AAh (0 1010 1010) in serial data */
case 0:
case 2:
case 4:
case 6:
case 8:
ret |= 0x08;
switch (kbd->kbd_readdata_step) {
case -4:
ret |= 0x0c; /* start bit */
break;
case -3:
ret |= 0x0c; /* start bit */
break;
case -2:
ret |= 0x08; /* start bit */
break;
case -1:
ret |= 0x0c; /* start bit */
break;
default:
ret |= 0x00;
if (!!(kbd->kbd_readdata_step & 1))
ret |= 0x04;
if ((kbd->key_waiting >> (kbd->kbd_readdata_step >> 1)) & 1)
ret |= 0x08;
break;
}
epoch_kbdlog(" reset step: %d %x %x", kbd->kbd_reset_step, ret & 0x08, ret & 0x04);
epoch_kbdlog(" Clk: %x %x\n", kbd->blocked, kbd->clk_hold);
kbd->kbd_reset_step++;
/* Specific 5556 keyboards send three bytes of identification code,
but this simply sends AAh that can pass the IPL and DOS K3.4 init. */
if (kbd->kbd_reset_step == 18)
kbd_epoch_adddata(0xaa);
} else if (kbd->mouse_reset_step < 20) {
ret &= 0xf3;
if (!!(kbd->mouse_reset_step & 1))
ret |= 0x04;
epoch_kbdlog(" reset step: %d %x %x\n", kbd->mouse_reset_step, ret & 0x08, ret & 0x04);
kbd->mouse_reset_step++;
epoch_kbdlog(" rdata step: %d %x %x\n", kbd->kbd_readdata_step, ret & 0x08, ret & 0x04);
}
/* Bit 1: Timer 2 (Speaker) out state */
@@ -1777,7 +1812,8 @@ kbd_read(uint16_t port, void *priv)
default:
break;
}
epoch_kbdlog("%04X:%04X epochkbd: Port %02X in : %02X pb: %02x CX: %04x\n", cs >> 4, cpu_state.pc, port, ret, kbd->pb, CX);
// if (port != 0x61)
epoch_kbdlog("%04X:%04X epochkbd: Port %02X in : %02X pb: %02x CX: %04x\n", cs >> 4, cpu_state.pc, port, ret, kbd->pb, CX);
return ret;
}
@@ -1786,21 +1822,11 @@ kbd_reset(void *priv)
{
epochkbd_t *kbd = (epochkbd_t *) priv;
kbd->want_irq = 0;
kbd->blocked = 0;
kbd->pa = 0x00;
kbd->pb = 0x00;
kbd->kbd_reset_step = 0xff;
kbd->mouse_reset_step = 0xff;
keyboard_scan = 1;
key_queue_start = 0;
key_queue_end = 0;
kbd_epoch_softreset(kbd);
kbd->pb = 0x00;
keyboard_scan = 1;
kbd->mouse_enabled = 0;
kbd->mouse_queue_num = 0;
kbd_epoch_adddata(0xaa);
}
static void *
@@ -1843,7 +1869,7 @@ kbd_close(void *priv)
}
static const device_t kbc_epoch_device = {
.name = "IBM 5550 Keyboard Controller",
.name = "IBM 5556 Keyboard and Mouse",
.internal_name = "kbc_epoch",
.flags = 0,
.local = 0,
@@ -2196,6 +2222,7 @@ epoch_init(UNUSED(const device_t *info))
{
epoch_t *epoch = calloc(1, sizeof(epoch_t));
epoch->font24 = device_get_config_int("model");
epoch->testmode = device_get_config_int("testmode");
video_inform(VIDEO_FLAG_TYPE_NONE, &timing_epoch_vid);
video_update_timing();
@@ -2233,7 +2260,7 @@ epoch_init(UNUSED(const device_t *info))
io_sethandler(0x44, 0x0001,
epoch_misc_in, NULL, NULL, epoch_misc_out, NULL, NULL, epoch);
io_sethandler(0xA0, 0x0006,
io_sethandler(0xA0, 0x0008,
epoch_misc_in, NULL, NULL, epoch_misc_out, NULL, NULL, epoch);
io_sethandler(0x310, 0x0008,
epoch_misc_in, NULL, NULL, epoch_misc_out, NULL, NULL, epoch);
@@ -2342,13 +2369,20 @@ static const device_config_t epoch_config[] = {
{ .description = "" }
}
},
{
.name = "testmode",
.description = "Test mode",
.type = CONFIG_BINARY,
.default_int = 0,
.selection = { { 0 } }
},
{ .name = "", .description = "", .type = CONFIG_END }
// clang-format on
};
const device_t ibm5550_vid_device = {
.name = "IBM 5550 Video Adapter",
.internal_name = "ibm5550vid",
const device_t ibm5550_device = {
.name = "IBM 5551 System Unit",
.internal_name = "ibm5550",
.flags = DEVICE_ISA,
.local = 0,
.init = epoch_init,
@@ -2418,7 +2452,7 @@ machine_xt_ibm5550_init(const machine_t *model)
pit_ibm5550_init();
nmi_mask = 0;
device_add(&ibm5550_vid_device);
device_add(&ibm5550_device);
device_add(&lpt_port_device);
serial_t *uart = device_add(&ns8250_device);
@@ -2428,6 +2462,9 @@ machine_xt_ibm5550_init(const machine_t *model)
/* Tell mouse driver about our internal mouse. */
mouse_reset();
mouse_set_buttons(2);
/* I don't know the actual polling speed, but
a higher value may cause a conflict with the mouse driver */
mouse_set_sample_rate(30.0);
mouse_set_poll(epoch_mouse_poll, kbc);
}

4
src/machine/machine_table.c
View File

@@ -2724,11 +2724,11 @@ const machine_t machines[] = {
.kbc_p1 = 0xff,
.gpio = 0xffffffff,
.gpio_acpi = 0xffffffff,
.device = NULL,
.device = &ibm5550_device,
.kbd_device = NULL,
.fdc_device = NULL,
.sio_device = NULL,
.vid_device = &ibm5550_vid_device,
.vid_device = NULL,
.snd_device = NULL,
.net_device = NULL
},