Updated README
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Jeff Parsons
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3 changed files with 4655 additions and 4650 deletions
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@ -6,7 +6,7 @@ one of several JavaScript Machines in the [PCjs Project](https://github.com/jeff
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includes:
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* [PCx86](/docs/pcx86/), an x86-based IBM PC and PC-compatible emulator
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* [PC8080](/modules/pc8080/), a 8080-based machine emulator (e.g., [Space Invaders](/devices/pc8080/machine/invaders/))
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* [PC8080](/modules/pc8080/), a 8080-based machine emulator (e.g., [Space Invaders](/devices/pc8080/machine/invaders/), [VT100](pc8080/machine/vt100/))
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* [C1Pjs](/docs/c1pjs/), a 6502-based emulation of the Ohio Scientific [Challenger 1P](/devices/c1p/)
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All PCjs computer simulations are written entirely in [JavaScript](/modules/). No Flash, Java or other plugins are
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@ -13,6 +13,21 @@
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;
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stack_top equ 204eh
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scratch_start equ 204eh
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;
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; The "Keys Flag Byte/Buffer" at 0x2068 contains the following bits:
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;
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; 0-1 Key counter
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; 2 Key counter overflow bit
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; 3 Setup
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; 4 Control
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; 5 Shift
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; 6 Caps Lock
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; 7 Last Key
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;
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key_flags equ 2068h ; "Keys Flag Buffer"
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key_buffer equ 206ah ; start of the "three place New Key Address Buffer"
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cursor_countdn equ 212dh
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cursor_visible equ 21bah
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@ -21,7 +36,7 @@ cursor_visible equ 21bah
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;
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org 0
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di
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lxi sp,stack_top ; SP = 0x204e
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lxi sp,stack_top ; SP = 0x204e
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jmp reset
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;
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; Interrupt vector 0x1 for Keyboard
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@ -196,7 +211,7 @@ X00e0: out 82h
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; Done "beeping" now
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;
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X00e8: out 82h ; A = 0, so all LEDs off now
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lda X2068
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lda key_flags
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ora a
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jm X00f5
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mov a,d
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@ -207,18 +222,18 @@ X00f5: push d
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;
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; The next call issues the following:
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;
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; 03A2 CD8103 CALL 0381 ;stack=204A
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; 0B67 CDAD10 CALL 10AD ;stack=2048
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; 03A2 CD8103 CALL 0381 ;stack=204A
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; 0B67 CDAD10 CALL 10AD ;stack=2048
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; chipset.outPort(0x00A2,DC012,0x00) at 10BD
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; chipset.outPort(0x00A2,DC012,0x04) at 10C1
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;
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; and then:
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;
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; 03A2 CD8103 CALL 0381 ;stack=204A
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; 0B67 CDAD10 CALL 10AD ;stack=2048
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; 10C9 CDAA0F CALL 0FAA ;stack=2046
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; 0FB6 CC8814 CALLZ 1488 ;stack=2040
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; 1488 CD9314 CALL 1493 ;stack=203E
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; 03A2 CD8103 CALL 0381 ;stack=204A
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; 0B67 CDAD10 CALL 10AD ;stack=2048
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; 10C9 CDAA0F CALL 0FAA ;stack=2046
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; 0FB6 CC8814 CALLZ 1488 ;stack=2040
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; 1488 CD9314 CALL 1493 ;stack=203E
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; chipset.inPort(0x0042,FLAGS.BUFFER): 0x60 at 1493
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;
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; Note that once we're inside 0FAA, that appears to be where we stay.
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@ -230,16 +245,6 @@ X00f5: push d
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;
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; Keyboard interrupt handler
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;
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; The "Keys Flag Byte/Buffer" at 0x2068 contains the following bits:
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;
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; 0-1 Key counter
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; 2 Key counter overflow bit
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; 3 Setup
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; 4 Control
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; 5 Shift
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; 6 Caps Lock
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; 7 Last Key
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;
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X00fd: push psw
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in 82h ;; Read from keyboard port
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push h
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@ -254,18 +259,18 @@ X00fd: push psw
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X010d: rlc
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dcr h
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jnz X010d
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lxi h,X2068 ;; load keys flag addresss
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lxi h,key_flags ;; load keys flag addresss
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ora m ;; or in control bit
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mov m,a ;; store again
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jmp X012d ;; jump to end to interrupt
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X011a: lxi h,X2068 ;; load keys flag address
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X011a: lxi h,key_flags ;; load keys flag address
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mvi a,7
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ana m ;; load key counter
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cpi 4 ;; if overflow.. (>3 keys)
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jp X012d ;; discard keypress and end interrupt
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inr m ;; otherwise increment key counter
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lxi h,X206a ;; load key address buffer?
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lxi h,key_buffer ;; load key address buffer
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call X13de ;; add key counter to address buffer
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mov m,b ;; save key to address buffer
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X012d: pop b
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@ -352,7 +357,7 @@ X01c3: lxi h,X0815
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rnz
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call X0853
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lxi b,X020e
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lxi h,X2068
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lxi h,key_flags
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mov a,m
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ani 10h
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jnz X0900
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@ -480,7 +485,7 @@ X02c0: call X0a15 ;; 0x2140 = 0xe605
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lxi h,2000h ;; HL = 0x2000
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lxi d,X02d9 ;; DE = 0x02d9
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mvi b,12h ;; B = 18
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call memmov ;; copy 18 bytes from 0x02d9 to 0x2000
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call memmove ;; copy 18 bytes from 0x02d9 to 0x2000
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lxi h,X3000 ;; HL = 0x3000
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lxi d,X1000 ;; DE = 0x1000
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mvi b,0ffh ;; B = 0xFF
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@ -573,15 +578,15 @@ X0381: lda X21a2
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jz X0b63
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jmp X0b77
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;;
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;; Performs a memmove(HL,DE,B)
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;; memmove(0x038b): Move B bytes at DE to HL
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;;
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memmov:
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X038b: ldax d ;; Load memory at DE into accumulator
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memmove:
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ldax d ;; Load memory at DE into accumulator
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mov m,a ;; Store it at HL
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inx h ;; HL++
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inx d ;; DE++
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dcr b ;; B--
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jnz X038b ;; until B is zero
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jnz memmove ;; until B is zero
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ret
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X0394: lda X21a5
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@ -988,7 +993,7 @@ X06a7: mov a,d
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ora a
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ret
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X06aa: lda X2068 ; A <- [Keys flag buffer]
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X06aa: lda key_flags ; A <- [Keys flag buffer]
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mov e,a
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ani 80h ; bit 7 set?
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rz ; return if not
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@ -1012,7 +1017,7 @@ X06ca: mov a,m
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push h
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push b
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mvi b,3
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lxi h,X206a
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lxi h,key_buffer
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X06d6: cmp m
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jz X06df
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inx h
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@ -1082,7 +1087,7 @@ X0743: pop h
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X0747: mov a,c
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cpi 4
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rp
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lxi b,X206a
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lxi b,key_buffer
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X074e: lxi h,X206e
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X0751: mov a,m
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ora a
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@ -1216,7 +1221,7 @@ X0838: lda X2150
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mvi a,0e1h
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sta X2072
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X0841: xra a
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lxi h,X2068
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lxi h,key_flags
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mov d,m
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mov m,a
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inx h
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@ -1889,7 +1894,7 @@ X0c62: lxi h,X05ad
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lxi h,X20f8
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lxi d,X2102
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X0c77: mvi b,0bh
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call memmov
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call memmove
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jmp X1636
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lxi h,X0c8a
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@ -3634,7 +3639,7 @@ X17ac: mov a,c
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X17be: lxi d,X17ec ;; DE = 0x17ec
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mvi b,7 ;; B = 7
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lxi h,X21cc ;; HL = 0x21cc
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call memmov ;; Initialize 0x21cc to Wait message
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call memmove ;; Initialize 0x21cc to Wait message
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lxi h,Xcc71 ;; HL = 0xcc71
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shld X2004 ;; retarget screen ram to display wait message
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ret
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@ -3647,7 +3652,7 @@ X17d5: mvi m,80h
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jnz X17d5
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lxi d,X17f3 ;; DE = 0x17f3
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mvi b,0bh ;; B = 11
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call memmov ;; store
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call memmove ;; store
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mvi c,1
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mvi a,30h
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sta X2078
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@ -4431,7 +4436,7 @@ X1d56: db 20h
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db 20h
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X1d61: mov c,a
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mvi b,0bh
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call memmov
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call memmove
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mov a,c
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rrc
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rrc
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@ -4446,7 +4451,7 @@ X1d61: mov c,a
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dad b
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xchg
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mvi b,5
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jmp memmov
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jmp memmove
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X1d7c: db 20h
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db 20h
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@ -4833,9 +4838,7 @@ X205b equ 205bh
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X205c equ 205ch
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X2065 equ 2065h
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X2067 equ 2067h
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X2068 equ 2068h ; Keys flag buffer
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X2069 equ 2069h
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X206a equ 206ah ; Start of the "three place New Key Address Buffer"
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X206e equ 206eh
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X2072 equ 2072h
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X2073 equ 2073h
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