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DSP: I hereby name R08-R11 WR0-WR3, standing for Wrap control Registers 0-3.

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Kill "CR". 
Document decrements a little bit.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@3126 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
hrydgard 2009-05-01 19:07:29 +00:00
parent 9b642fa1f8
commit 0d57b7f01a
8 changed files with 95 additions and 114 deletions
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21
Source/Core/DSPCore/Src/DSPInterpreter.cpp
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@ -457,6 +457,7 @@ void lri(const UDSPInstruction& opc)
u8 reg = opc.hex & DSP_REG_MASK; u8 reg = opc.hex & DSP_REG_MASK;
u16 imm = dsp_fetch_code(); u16 imm = dsp_fetch_code();
dsp_op_write_reg(reg, imm); dsp_op_write_reg(reg, imm);
dsp_conditional_extend_accum(reg);
} }
// LRIS $(0x18+D), #I // LRIS $(0x18+D), #I
@ -468,6 +469,7 @@ void lris(const UDSPInstruction& opc)
u8 reg = ((opc.hex >> 8) & 0x7) + DSP_REG_AXL0; u8 reg = ((opc.hex >> 8) & 0x7) + DSP_REG_AXL0;
u16 imm = (s8)opc.hex; u16 imm = (s8)opc.hex;
dsp_op_write_reg(reg, imm); dsp_op_write_reg(reg, imm);
dsp_conditional_extend_accum(reg);
} }
// LR $D, @M // LR $D, @M
@ -481,6 +483,7 @@ void lr(const UDSPInstruction& opc)
u16 addr = dsp_fetch_code(); u16 addr = dsp_fetch_code();
u16 val = dsp_dmem_read(addr); u16 val = dsp_dmem_read(addr);
dsp_op_write_reg(reg, val); dsp_op_write_reg(reg, val);
dsp_conditional_extend_accum(reg);
} }
// SR @M, $S // SR @M, $S
@ -1392,12 +1395,7 @@ void dar(const UDSPInstruction& opc)
{ {
int reg = opc.hex & 0x3; int reg = opc.hex & 0x3;
int temp = g_dsp.r[reg] + g_dsp.r[DSP_REG_R08]; g_dsp.r[reg]--; // TODO: Wrap properly.
if (temp <= 0x7ff) // ???
g_dsp.r[reg] = temp;
else
g_dsp.r[reg]--;
} }
@ -1410,12 +1408,7 @@ void iar(const UDSPInstruction& opc)
{ {
int reg = opc.hex & 0x3; int reg = opc.hex & 0x3;
int temp = g_dsp.r[reg] + g_dsp.r[DSP_REG_R08]; g_dsp.r[reg]++; // TODO: Wrap properly according to the corresponding WR register.
if (temp <= 0x7ff) // ???
g_dsp.r[reg] = temp;
else
g_dsp.r[reg]++;
} }
//------------------------------------------------------------- //-------------------------------------------------------------
@ -1476,7 +1469,7 @@ void srbith(const UDSPInstruction& opc)
g_dsp.r[DSP_REG_SR] |= SR_TOP_BIT_UNK; g_dsp.r[DSP_REG_SR] |= SR_TOP_BIT_UNK;
break; break;
// 40-bit precision? clamping? no idea :( // Automatic 40-bit sign extension when loading ACx.M.
// 40 seems to be the default. // 40 seems to be the default.
// Confirmed these by using DSPSpy and copying the value of SR to R00 after setting. // Confirmed these by using DSPSpy and copying the value of SR to R00 after setting.
case 0xe: // SET16 (really, clear SR's 0x4000) case 0xe: // SET16 (really, clear SR's 0x4000)
@ -1583,7 +1576,7 @@ void mulmvz(const UDSPInstruction& opc)
dsp_set_long_acc(rreg, acc); dsp_set_long_acc(rreg, acc);
// math prod // math prod
prod = (s64)g_dsp.r[DSP_REG_AXL0 + sreg] * (s64)g_dsp.r[DSP_REG_AXH0 + sreg] * GetMultiplyModifier(); prod = (s64)(s16)g_dsp.r[DSP_REG_AXL0 + sreg] * (s64)(s16)g_dsp.r[DSP_REG_AXH0 + sreg] * GetMultiplyModifier();
dsp_set_long_prod(prod); dsp_set_long_prod(prod);
Update_SR_Register64(prod); Update_SR_Register64(prod);

23
Source/Core/DSPCore/Src/DSPTables.cpp
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@ -309,7 +309,6 @@ const DSPOPCTemplate cw =
const DSPOPCTemplate opcodes_ext[] = const DSPOPCTemplate opcodes_ext[] =
{ {
// FIXME: guessing this is cr need checking // FIXME: guessing this is cr need checking
{"CR", 0x0000, 0x00fc, DSPInterpreter::Ext::cr, nop, 1, 1, {{P_REG, 1, 0, 0, 0x0003}}, NULL, NULL,},
{"DR", 0x0004, 0x00fc, DSPInterpreter::Ext::dr, nop, 1, 1, {{P_REG, 1, 0, 0, 0x0003}}, NULL, NULL,}, {"DR", 0x0004, 0x00fc, DSPInterpreter::Ext::dr, nop, 1, 1, {{P_REG, 1, 0, 0, 0x0003}}, NULL, NULL,},
{"IR", 0x0008, 0x00fc, DSPInterpreter::Ext::ir, nop, 1, 1, {{P_REG, 1, 0, 0, 0x0003}}, NULL, NULL,}, {"IR", 0x0008, 0x00fc, DSPInterpreter::Ext::ir, nop, 1, 1, {{P_REG, 1, 0, 0, 0x0003}}, NULL, NULL,},
{"NR", 0x000c, 0x00fc, DSPInterpreter::Ext::nr, nop, 1, 1, {{P_REG, 1, 0, 0, 0x0003}}, NULL, NULL,}, {"NR", 0x000c, 0x00fc, DSPInterpreter::Ext::nr, nop, 1, 1, {{P_REG, 1, 0, 0, 0x0003}}, NULL, NULL,},
@ -401,14 +400,14 @@ const pdlabel_t regnames[] =
{0x01, "AR1", "Addr Reg 01",}, {0x01, "AR1", "Addr Reg 01",},
{0x02, "AR2", "Addr Reg 02",}, {0x02, "AR2", "Addr Reg 02",},
{0x03, "AR3", "Addr Reg 03",}, {0x03, "AR3", "Addr Reg 03",},
{0x04, "IX0", "Index Reg 0(04)",}, {0x04, "IX0", "Index Reg 0",},
{0x05, "IX1", "Index Reg 1(05)",}, {0x05, "IX1", "Index Reg 1",},
{0x06, "IX2", "Index Reg 2(06)",}, {0x06, "IX2", "Index Reg 2",},
{0x07, "IX3", "Indec Reg 3(07)",}, {0x07, "IX3", "Index Reg 3",},
{0x08, "R08", "Register 08",}, {0x08, "WR0", "Wrapping Register 0",},
{0x09, "R09", "Register 09",}, {0x09, "WR1", "Wrapping Register 1",},
{0x0a, "R10", "Register 10",}, {0x0a, "WR2", "Wrapping Register 2",},
{0x0b, "R11", "Register 11",}, {0x0b, "WR3", "Wrapping Register 3",},
{0x0c, "ST0", "Call stack",}, {0x0c, "ST0", "Call stack",},
{0x0d, "ST1", "Data stack",}, {0x0d, "ST1", "Data stack",},
{0x0e, "ST2", "Loop addr stack",}, {0x0e, "ST2", "Loop addr stack",},
@ -435,6 +434,12 @@ const pdlabel_t regnames[] =
{0x21, "ACC1", "Accu Full 1",}, {0x21, "ACC1", "Accu Full 1",},
{0x22, "AX0", "Extra Accu 0",}, {0x22, "AX0", "Extra Accu 0",},
{0x23, "AX1", "Extra Accu 1",}, {0x23, "AX1", "Extra Accu 1",},
// Old names for the wrapping registers, for compatibility.
{0x08, "R08", "Wrapping Register 0(08)",},
{0x09, "R09", "Wrapping Register 1(09)",},
{0x0a, "R10", "Wrapping Register 2(10)",},
{0x0b, "R11", "Wrapping Register 3(11)",},
}; };
u8 opSize[OPTABLE_SIZE]; u8 opSize[OPTABLE_SIZE];

29
Source/Core/DSPCore/Src/gdsp_ext_op.cpp
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@ -29,22 +29,21 @@
// attached to opcodes that allow extending (8 lower bits of opcode not used by // attached to opcodes that allow extending (8 lower bits of opcode not used by
// opcode). Extended opcodes do not modify program counter $pc register. // opcode). Extended opcodes do not modify program counter $pc register.
// Most of the suffixes increment or decrement one or more addressing registers
// (the first four, ARx). The increment/decrement is either 1, or the corresponding
// "index" register (the second four, IXx). The addressing registers will wrap
// in odd ways, dictated by the corresponding wrapping register, WP0-3.
// The following should be applied as a decrement:
// ar[i] = (ar[i] & wp[i]) == 0 ? ar[i] | wp[i] : ar[i] - 1;
// I have not found the corresponding algorithms for increments yet.
// It's gotta be fairly simple though. See R3123, R3125 in Google Code.
namespace DSPInterpreter namespace DSPInterpreter
{ {
namespace Ext namespace Ext
{ {
// CR $arR
// xxxx xxxx 0000 00rr
// Clearing addressing register $arR.
// This is not in any doc and as such just a guess
void cr(const UDSPInstruction& opc) {
u8 reg = opc.hex & 0x3;
g_dsp.r[reg] = 0;
}
// DR $arR // DR $arR
// xxxx xxxx 0000 01rr // xxxx xxxx 0000 01rr
// Decrement addressing register $arR. // Decrement addressing register $arR.
@ -208,7 +207,6 @@ void dsp_op_ext_r_epi(const UDSPInstruction& opc)
{ {
u8 op = (opc.hex >> 2) & 0x3; u8 op = (opc.hex >> 2) & 0x3;
u8 reg = opc.hex & 0x3; u8 reg = opc.hex & 0x3;
switch (op) { switch (op) {
case 0x00: // case 0x00: //
g_dsp.r[reg] = 0; g_dsp.r[reg] = 0;
@ -375,7 +373,6 @@ void dsp_op_ext_ld(const UDSPInstruction& opc)
// //
// //
// ================================================================================ // ================================================================================
void dsp_op_ext_ops_pro(const UDSPInstruction& opc) void dsp_op_ext_ops_pro(const UDSPInstruction& opc)
{ {
if ((opc.hex & 0xFF) == 0){return;} if ((opc.hex & 0xFF) == 0){return;}
@ -428,7 +425,10 @@ void dsp_op_ext_ops_pro(const UDSPInstruction& opc)
void dsp_op_ext_ops_epi(const UDSPInstruction& opc) void dsp_op_ext_ops_epi(const UDSPInstruction& opc)
{ {
if ((opc.hex & 0xFF) == 0){return;} if ((opc.hex & 0xFF) == 0)
{
return;
}
switch ((opc.hex >> 4) & 0xf) switch ((opc.hex >> 4) & 0xf)
{ {
@ -436,7 +436,6 @@ void dsp_op_ext_ops_epi(const UDSPInstruction& opc)
case 0x09: case 0x09:
case 0x0a: case 0x0a:
case 0x0b: case 0x0b:
if (opc.hex & 0x2) if (opc.hex & 0x2)
{ {
dsp_op_ext_sl_epi(opc.hex); dsp_op_ext_sl_epi(opc.hex);
@ -450,5 +449,3 @@ void dsp_op_ext_ops_epi(const UDSPInstruction& opc)
return; return;
} }
} }

1
Source/Core/DSPCore/Src/gdsp_ext_op.h
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@ -62,7 +62,6 @@ void ldn(const UDSPInstruction& opc);
void ldm(const UDSPInstruction& opc); void ldm(const UDSPInstruction& opc);
void ldnm(const UDSPInstruction& opc); void ldnm(const UDSPInstruction& opc);
void mv(const UDSPInstruction& opc); void mv(const UDSPInstruction& opc);
void cr(const UDSPInstruction& opc);
void dr(const UDSPInstruction& opc); void dr(const UDSPInstruction& opc);
void ir(const UDSPInstruction& opc); void ir(const UDSPInstruction& opc);
void nr(const UDSPInstruction& opc); void nr(const UDSPInstruction& opc);

68
Source/Core/DSPCore/Src/gdsp_opcodes_helper.h
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@ -83,50 +83,19 @@ inline u16 dsp_op_read_reg(u8 reg)
inline void dsp_op_write_reg(u8 reg, u16 val) inline void dsp_op_write_reg(u8 reg, u16 val)
{ {
switch (reg & 0x1f) { switch (reg & 0x1f) {
/*
case DSP_REG_ACH0:
case DSP_REG_ACH1:
// sign extend from the bottom 8 bits.
g_dsp.r[reg] = (u16)(s16)(s8)(u8)val;
break;
*/
case 0x0c: case 0x0c:
case 0x0d: case 0x0d:
case 0x0e: case 0x0e:
case 0x0f: case 0x0f:
dsp_reg_store_stack(reg - 0x0c, val); dsp_reg_store_stack(reg - 0x0c, val);
break; break;
#if 0 // FIXME
case 0x1e: // AC0.M
case 0x1f: // AC1.M
// in "s16 mode", LRI $AC0.M, xxx will set AC0.L and AC0.H to 0,
// while it won't in "s40 mode".
if (g_dsp.r[DSP_REG_SR] & SR_16_BIT) {
g_dsp.r[reg - 0x2] = 0; // L
g_dsp.r[reg - 0xe] = 0; // H
}
g_dsp.r[reg] = val;
break;
case 0x1c: // AC0.L
case 0x1d: // AC1.L
if (g_dsp.r[DSP_REG_SR] & SR_16_BIT) {
g_dsp.r[reg + 0x2] = 0; // M
g_dsp.r[reg - 0xc] = 0; // H
}
g_dsp.r[reg] = val;
break;
case 0x10: // AC0.H
case 0x11: // AC1.H
if (g_dsp.r[DSP_REG_SR] & SR_16_BIT) {
g_dsp.r[reg + 0xc] = 0; // L
g_dsp.r[reg + 0xe] = 0; // M
}
g_dsp.r[reg] = val;
break;
#endif
default: default:
g_dsp.r[reg] = val; g_dsp.r[reg] = val;
@ -134,6 +103,25 @@ inline void dsp_op_write_reg(u8 reg, u16 val)
} }
} }
inline void dsp_conditional_extend_accum(u8 reg)
{
#if 0
switch (reg)
{
case DSP_REG_ACM0:
case DSP_REG_ACM1:
if (g_dsp.r[DSP_REG_SR] & SR_40_MODE_BIT)
{
// Sign extend into whole accum.
u16 val = g_dsp.r[reg];
g_dsp.r[reg - DSP_REG_ACM0 + DSP_REG_ACH0] = (val & 0x8000) ? 0xFFFF : 0x0000;
g_dsp.r[reg - DSP_REG_ACM0 + DSP_REG_ACL0] = 0;
}
}
#endif
}
// --------------------------------------------------------------------------------------- // ---------------------------------------------------------------------------------------
// //
@ -253,13 +241,13 @@ inline s64 dsp_get_long_acx(int _reg)
inline s16 dsp_get_ax_l(int _reg) inline s16 dsp_get_ax_l(int _reg)
{ {
_assert_(_reg < 2); _assert_(_reg < 2);
return g_dsp.r[0x18 + _reg]; return (s16)g_dsp.r[0x18 + _reg];
} }
inline s16 dsp_get_ax_h(int _reg) inline s16 dsp_get_ax_h(int _reg)
{ {
_assert_(_reg < 2); _assert_(_reg < 2);
return g_dsp.r[0x1a + _reg]; return (s16)g_dsp.r[0x1a + _reg];
} }
#endif #endif

29
Source/Core/DSPCore/Src/gdsp_registers.h
View File

@ -31,19 +31,19 @@
#define DSP_REG_AR0 0x00 // address registers #define DSP_REG_AR0 0x00 // address registers
#define DSP_REG_AR1 0x01 #define DSP_REG_AR1 0x01
#define DSP_REG_AR2 0x02 #define DSP_REG_AR2 0x02
#define DSP_REG_AR3 0x03 // used as jump function selector #define DSP_REG_AR3 0x03
#define DSP_REG_IX0 0x04 // LEFT_VOLUME accel #define DSP_REG_IX0 0x04 // indexing registers (actually, mostly used as increments)
#define DSP_REG_IX1 0x05 // RIGHT_VOLUME accel #define DSP_REG_IX1 0x05
#define DSP_REG_IX2 0x06 // ADDRH_SMP accel #define DSP_REG_IX2 0x06
#define DSP_REG_IX3 0x07 // ADDRL_SMP accel #define DSP_REG_IX3 0x07
#define DSP_REG_R08 0x08 // fixed to 48000 value #define DSP_REG_WR0 0x08 // address wrapping registers. should be initialized to 0xFFFF if not used.
#define DSP_REG_R09 0x09 // problems using this #define DSP_REG_WR1 0x09
#define DSP_REG_R0A 0x0a // ADDREH_SMP accel #define DSP_REG_WR2 0x0a
#define DSP_REG_R0B 0x0b // ADDREL_SMP accel #define DSP_REG_WR3 0x0b
#define DSP_REG_ST0 0x0c #define DSP_REG_ST0 0x0c // stacks.
#define DSP_REG_ST1 0x0d #define DSP_REG_ST1 0x0d
#define DSP_REG_ST2 0x0e #define DSP_REG_ST2 0x0e
#define DSP_REG_ST3 0x0f #define DSP_REG_ST3 0x0f
@ -51,15 +51,15 @@
#define DSP_REG_CONFIG 0x12 #define DSP_REG_CONFIG 0x12
#define DSP_REG_SR 0x13 #define DSP_REG_SR 0x13
#define DSP_REG_PRODL 0x14 #define DSP_REG_PRODL 0x14 // product.
#define DSP_REG_PRODM 0x15 #define DSP_REG_PRODM 0x15
#define DSP_REG_PRODH 0x16 #define DSP_REG_PRODH 0x16
#define DSP_REG_PRODM2 0x17 #define DSP_REG_PRODM2 0x17
#define DSP_REG_AXL0 0x18 #define DSP_REG_AXL0 0x18
#define DSP_REG_AXL1 0x19 #define DSP_REG_AXL1 0x19
#define DSP_REG_AXH0 0x1a // SMP_R accel #define DSP_REG_AXH0 0x1a
#define DSP_REG_AXH1 0x1b // SMP_L accel #define DSP_REG_AXH1 0x1b
#define DSP_REG_ACC0 0x1c // accumulator (global) #define DSP_REG_ACC0 0x1c // accumulator (global)
#define DSP_REG_ACC1 0x1d #define DSP_REG_ACC1 0x1d
@ -85,6 +85,7 @@
#define DSP_REG_CMBH 0xfffe // CPU Mailbox H #define DSP_REG_CMBH 0xfffe // CPU Mailbox H
#define DSP_REG_CMBL 0xffff // CPU Mailbox L #define DSP_REG_CMBL 0xffff // CPU Mailbox L
#define DMA_TO_DSP 0 #define DMA_TO_DSP 0
#define DMA_TO_CPU 1 #define DMA_TO_CPU 1
@ -92,7 +93,6 @@
#define DSP_STACK_C 0 #define DSP_STACK_C 0
#define DSP_STACK_D 1 #define DSP_STACK_D 1
// SR bits // SR bits
#define SR_CARRY 0x0001 #define SR_CARRY 0x0001
#define SR_2 0x0002 // overflow??? #define SR_2 0x0002 // overflow???
@ -107,7 +107,6 @@
#define SR_40_MODE_BIT 0x4000 // 0 = "16", 1 = "40" (SET16, SET40) Controls sign extension when loading mid accums. #define SR_40_MODE_BIT 0x4000 // 0 = "16", 1 = "40" (SET16, SET40) Controls sign extension when loading mid accums.
#define SR_TOP_BIT_UNK 0x8000 // 1 = normal. 0 = x2 (CLR15, SET15) ???????? #define SR_TOP_BIT_UNK 0x8000 // 1 = normal. 0 = x2 (CLR15, SET15) ????????
void dsp_reg_store_stack(u8 stack_reg, u16 val); void dsp_reg_store_stack(u8 stack_reg, u16 val);
u16 dsp_reg_load_stack(u8 stack_reg); u16 dsp_reg_load_stack(u8 stack_reg);

20
Source/DSPSpy/tests/dr_test.ds
View File

@ -2,24 +2,24 @@
incdir "tests" incdir "tests"
include "dsp_base.inc" include "dsp_base.inc"
; Tests done using AR1 = 0x0010, IX1 = 0. LP1 means R09. ; Tests done using AR1 = 0x0010, IX1 = 0. WR1 (wrap 1) means R09.
; LP1 = 0 ; WR1 = 0
; 10, 10, 10, 10, ; 10, 10, 10, 10,
; LP1 = 1 ; WR1 = 1
; 10, 11, 10, 11, ; 10, 11, 10, 11,
; LP1 = 2 ; WR1 = 2
; 10, 12, 11, 13, 12, 11, 13, 12, 11, 13, 12, 11 ; 10, 12, 11, 13, 12, 11, 13, 12, 11, 13, 12, 11
; LP1 = 3 ; WR1 = 3
; 10, 13, 12, 11, 10, 13, 12... ; 10, 13, 12, 11, 10, 13, 12...
; LP1 = 4 ; WR1 = 4
; 10, 14, 13, 17, 16, 15, 14, 13, 17, 16, 15, 14, 13, ... ; 10, 14, 13, 17, 16, 15, 14, 13, 17, 16, 15, 14, 13, ...
; LP1 = 5 ; WR1 = 5
; 10, 15, 14, 13, 12, 17, 16, 15, 14, 13, 12, 17, ; 10, 15, 14, 13, 12, 17, 16, 15, 14, 13, 12, 17,
; LP1 = 6 ; WR1 = 6
; 10, 16, 15, 14, 13, 12, 11, 17, 16, 15, 14, 13 ; 10, 16, 15, 14, 13, 12, 11, 17, 16, 15, 14, 13
; LP1 = 7 ; WR1 = 7
; 10, 17, 16, 15, .. normal ; 10, 17, 16, 15, .. normal
; LP1 = 8 ; WR1 = 8
; 10, 18, 17, 1f, 1e, 1d, 1c, 1b, 1a, 19, 18, 17, 1f, 1e, ..... ; 10, 18, 17, 1f, 1e, 1d, 1c, 1b, 1a, 19, 18, 17, 1f, 1e, .....

18
Source/DSPSpy/tests/ir_test.ds
View File

@ -8,23 +8,23 @@ include "dsp_base.inc"
; These were proven FALSE though by the following: ; These were proven FALSE though by the following:
; Tests done using AR1 = 0x0010, IX1 = 0 ; Tests done using AR1 = 0x0010, IX1 = 0
; LP1 = 0 ; WR1 = 0
; 10, 11, 11, 11, 11...... ; 10, 11, 11, 11, 11......
; LP1 = 1 ; WR1 = 1
; 10, 11, 10, 11, 10...... ; 10, 11, 10, 11, 10......
; LP1 = 2 ; WR1 = 2
; 10, 11, 12, 13, 11, 12, 13, 11, 12, 13 ...... ; 10, 11, 12, 13, 11, 12, 13, 11, 12, 13 ......
; LP1 = 3 ; WR1 = 3
; 10, 11, 12, 13, 10, 11, 12, 13, 10, 11, 12, 13....... ; 10, 11, 12, 13, 10, 11, 12, 13, 10, 11, 12, 13.......
; LP1 = 4 ; WR1 = 4
; 10, 11, 12, 13, 14, 15, 16, 17, 13, 14, 15, 16, 17, 13, 14, 15 ...... ; 10, 11, 12, 13, 14, 15, 16, 17, 13, 14, 15, 16, 17, 13, 14, 15 ......
; LP1 = 5 ; WR1 = 5
; 10, 11, 12, 13, 14, 15, 16, 17, 12, 13, 14, 15 ... ; 10, 11, 12, 13, 14, 15, 16, 17, 12, 13, 14, 15 ...
; LP1 = 6 ; WR1 = 6
; 10, 11, 12, 13, 14, 15, 16, 17, 11, 12, 13, 14... ; 10, 11, 12, 13, 14, 15, 16, 17, 11, 12, 13, 14...
; LP1 = 7 ; WR1 = 7
; 10, 11, 12, 13, 14, 15, 16, 17, 10, 11, .... ; 10, 11, 12, 13, 14, 15, 16, 17, 10, 11, ....
; LP1 = 8 ; WR1 = 8
; 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 1a, 1b, 1c, 1d, 1e, 1f, 17, 18, 19, 1a, 1b..... ; 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 1a, 1b, 1c, 1d, 1e, 1f, 17, 18, 19, 1a, 1b.....