Cannot get past "Memory Size ?"
Posted: Wed Oct 24, 2018 3:15 am
So I have EhBASIC 2.22 running. I'm at the point where it asks for [W] or [C] start. I press C and I then get asked for memory size.
No matter what I enter, it jumps back to the same "Memory size ? " prompt. I've done some research and I've changed IBuffs, RAM_Base, etc.
For example, I tried this to no avail:
My system has 16K of RAM and 32K of ROM.
My ld65 config file is:
My current mon.asm is:
Note, my display is still looking weird because I am using an LCD (20x4). So I'm not sure if that's the problem. I want to think it isn't recognizing my input. But, it correctly works at the [C]/[W] prompt.
Any help would be appreciated.
Thanks!
No matter what I enter, it jumps back to the same "Memory size ? " prompt. I've done some research and I've changed IBuffs, RAM_Base, etc.
For example, I tried this to no avail:
Code: Select all
Ibuffs = $0401 ; start of input buffer after IRQ/NMI code
Ibuffe = Ibuffs + $47; end of input buffer
Ram_base = $0600 ; start of user RAM (set as needed, should be page aligned)
Ram_top = $4000 ; end of user RAM+1 (set as needed, should be page aligned)
My ld65 config file is:
Code: Select all
MEMORY {
ZP: start = $0000, size = $0100, type = rw;
RAM: start = $0000, size = $4000, fill = no, type = rw;
ROM: start = $8000, size = $3000, fill = yes;
EhBASIC: start = $B000, size = $3000, fill = yes;
LCD: start = $E000, size = $0C00, fill = yes;
KEYB: start = $EC00, size = $0400, fill = yes;
UTILS: start = $F000, size = $0FFA, fill = yes;
VEC: start = $FFFA, size = $0006, fill = yes;
}
SEGMENTS {
ZEROPAGE: load = ZP, type = zp;
CODE: load = ROM, type = ro;
BASIC: load = EhBASIC, type = ro;
LCD: load = LCD, type = ro;
KEYBOARD: load = KEYB, type = ro;
UTILS: load = UTILS, type = ro;
VECTORS: load = VEC, type = ro;
}
Code: Select all
.debuginfo +
.setcpu "65C02"
IRQ_vec = VEC_SV + 2 ; IRQ code vector
NMI_vec = IRQ_vec + $0A ; NMI code vector
VIA := $6000
VIA2 := $5800
PB := VIA
PA := VIA + 1
DDRB := VIA + 2
DDRA := VIA + 3
PB2 := VIA2
PA2 := VIA2 + 1
DDRB2 := VIA2 + 2
DDRA2 := VIA2 + 3
ESC = $1B ; Escape character
CR = $0D ; Return character
LF = $0A ; Line feed character
IN = $0200 ; Buffer used by GetLine.
; From $0200 through $027F (shared with Woz Mon)
; Defined in wozmon.asm
LCDpl = $DE ; temporary integer low byte
LCDPh = LCDpl + 1 ; temporary integer high byte
.include "EhBASIC.asm"
.include "lcd.asm"
.include "pckybd.asm"
.include "utils.asm"
;-------------------------------------------------------------------------------
; Main RESET Vector (ROM Startup)
;-------------------------------------------------------------------------------
.segment "CODE"
.org $8000
RES_vec:
CLD ; clear decimal mode
LDX #$FF ; empty stack
TXS ; set the stack
JSR INITS
MAIN:
JMP MAIN
;-------------------------------------------------------------------------------
; System Initializations
;-------------------------------------------------------------------------------
INITS:
; Set on-board VIA data direction registers
LDA #$FF
STA DDRA ; PORT A is all output
STA DDRB ; PORT B is all output
JSR LCD_INIT ; Initialize the LCD module
LDX #<LINE1 ; Print the 4 line startup message
LDY #>LINE1
JSR PrintString
LDX #<LINE3
LDY #>LINE3
JSR PrintString
LDA #$40
JSR LCD_SET_DRAM_ADDRESS
LDX #<LINE2
LDY #>LINE2
JSR PrintString
LDX #<LINE4
LDY #>LINE4
JSR PrintString
JSR kbinit
;-------------------------------------------------------------------------------
; Setup EhBASIC
;-------------------------------------------------------------------------------
; set up vectors and interrupt code, copy them to page 2
LDY #END_CODE - LAB_vec ; set index/count
LAB_stlp:
LDA LAB_vec - 1, Y ; get byte from interrupt code
STA VEC_IN - 1, Y ; save to RAM
DEY ; decrement index/count
BNE LAB_stlp ; loop if more to do
; now do the signon message, Y = $00 here
LAB_signon:
LDA LAB_mess, Y ; get byte from sign on message
BEQ LAB_nokey ; exit loop if done
JSR V_OUTP ; output character
INY ; increment index
BNE LAB_signon ; loop, branch always
LAB_nokey:
JSR V_INPT ; call scan input device
BCC LAB_nokey ; loop if no key
AND #$DF ; mask xx0x xxxx, ensure upper case
CMP #'W' ; compare with [W]arm start
BEQ LAB_dowarm ; branch if [W]arm start
CMP #'C' ; compare with [C]old start
BNE RES_vec ; loop if not [C]old start
JMP LAB_COLD ; do EhBASIC cold start
LAB_dowarm:
JMP LAB_WARM ; do EhBASIC warm start
;-------------------------------------------------------------------------------
; PRINT CHAR TO LCD FROM KEYBOARD INPUT
;-------------------------------------------------------------------------------
DISPout:
CMP #LF ; Ignore line feed character
BEQ Ignore
WaitForReady: ;; Originally, waits for BIT $D012 on Replica One.
;; In a perfect world, we should wait on LCD status of ready.
;; Ignore for now
;; DRAW CHAR TO LCD SCREEN
JSR WriteLCD
Ignore:
RTS
;-------------------------------------------------------------------------------
; GET KEYBOARD INPUT
;-------------------------------------------------------------------------------
KEYBin:
;; GET KEYBOARD CHAR
JSR kbinput ; Waits for ASCII key press.
; A should now have ASCII character
; (waits for a non-zero ASCII code)
BEQ LAB_nobyw ; branch if no byte waiting
SEC ; flag byte received
RTS
LAB_nobyw:
CLC ; flag no byte received
;-------------------------------------------------------------------------------
;; LOAD / SAVE ROUTINES
;-------------------------------------------------------------------------------
LOAD:
SAVE:
;; IGNORE FOR NOW
RTS
JMP MAIN
;-------------------------------------------------------------------------------
; Print a string
;-------------------------------------------------------------------------------
; Pass address of string in X (low) and Y (high).
; String must be terminated with a null.
; Cannot be longer than 256 characters.
; Registers changed: A, Y
;-------------------------------------------------------------------------------
PrintString:
STX LCDpl
STY LCDpl + 1
LDY #0
@loop: LDA (LCDpl), Y
BEQ done
JSR DISPout
INY
BNE @loop ; if doesn't branch, string is too long
done: RTS
;-------------------------------------------------------------------------------
; Sends A to LCD screen at current cursor position
;-------------------------------------------------------------------------------
WriteLCD:
STA PA
JSR LCD_WRITE
RTS
;-------------------------------------------------------------------------------
; GETLINE
;-------------------------------------------------------------------------------
; NOTE: This was used in the min_mon for file loading/saving.
; At this time, I'm not sure where this should be used (if at all).
; Having the current LINE entered is certainly important.
; TODO: Figure out where to use this!
; Perhaps when asking user a question?
;-------------------------------------------------------------------------------
GetLine:
LDX #0 ; Initialize index into buffer
loop:
JSR KEYBin ; Get character from keyboard
BCC loop
CMP #CR ; <Enter> key pressed?
BEQ EnterPressed ; If so, handle it
CMP #ESC ; <Esc> key pressed?
BEQ EscapePressed ; If so, handle it
JSR DISPout ; Echo the key pressed
STA IN+1, X ; Store character in buffer
; (skip first length byte)
INX ; Advance index into buffer
CPX #$7E ; Buffer full?
BEQ EnterPressed ; If so, return as if <Enter> was pressed
BNE loop ; Always taken
EnterPressed:
CLC ; Clear carry to indicate
; <Enter> pressed and fall through
EscapePressed:
LDA #0
STA IN+1, X ; Store 0 at end of buffer
STX IN ; Store length of string
RTS ; Return
;-------------------------------------------------------------------------------
; VECTOR TABLES
;-------------------------------------------------------------------------------
LAB_vec:
.word KEYBin ; byte in from simulated ACIA
.word DISPout ; byte out to simulated ACIA
.word LOAD ; load vector for EhBASIC
.word SAVE ; save vector for EhBASIC
END_CODE:
;-------------------------------------------------------------------------------
; MESSAGES
;-------------------------------------------------------------------------------
LAB_mess:
.byte $0D, $0A, "EhBASIC[C]old/[W]arm", $00
; sign on string
LINE1:
.byte "* Potpourri 6502 *", $00
LINE2:
.byte "EhBASIC: ", $00
LINE3:
.byte "[C]old / [W]arm? ", $00
LINE4:
.byte "Enter your choice...", $00
;-------------------------------------------------------------------------------
; Startup Vectors
;-------------------------------------------------------------------------------
.segment "VECTORS"
.word NMI_vec ; NMI Vector
.word RES_vec ; RESET Vector
.word IRQ_vec ; IRQ Vector
Note, my display is still looking weird because I am using an LCD (20x4). So I'm not sure if that's the problem. I want to think it isn't recognizing my input. But, it correctly works at the [C]/[W] prompt.
Any help would be appreciated.
Thanks!