Cartridge that takes a 28 PIN ROM

[+David_P]

I'll defer to the more knowledgeable folks on this forum - I know just enough to be dangerous, and know next to nothing about Mac cross development...

[boisy]

Well, I'm making some progress with ca65/ld65. So far I have this code:

 

; *****************************
; CIO equates
; *****************************
ICHID  =   $0340
ICDNO  =   $0341
ICCOM  =   $0342
ICSTA  =   $0343
ICBAL  =   $0344
ICBAH  =   $0345
ICPTL  =   $0346
ICPTH  =   $0347
ICBLL  =   $0348
ICBLH  =   $0349
ICAXl  =   $034A
ICAX2  =   $034B
CIOV   =   $E456

.segment "CODE"

; *****************************
; Now we load in required data
; *****************************
	LDX #0        ; Since it's IOCB0
	LDA #9        ; For put record
	STA ICCOM,X   ; Command byte
	LDA #<MSG	  ; Low byte of MSG
	STA ICBAL,X   ;  into ICBAL
	LDA #>MSG	  ; High byte of MSG
	STA ICBAH,X   ;  into ICBAH
	LDA #0        ; Length of MSG
	STA ICBLH,X   ;  high byte
	LDA #$FF      ; Length of MSG
	STA ICBLL,X   ; See discussion
; *****************************
; Now put it to the screen
; *****************************
	JSR CIOV
B:	JMP B
	RTS
; *****************************
; The message itself
; *****************************
MSG:    .asciiz "A SUCCESSFUL WRITE!"
	.byte $9B

And created this 'atari.cfg' file:

# Linker config file for targeting the Atari 2600.

MEMORY {
       RAM:   start = $80,   size=$80, type = rw, define = yes;
       ROM:   start = $E000, size=$2000, type = ro, file = %O, define = yes;
       TIA:   start = $00,   size=$40, type = rw, define = yes;
       RIOT:  start = $280,  size=$20, type = rw, define = yes;
}

SEGMENTS {
       RODATA:   load=ROM, type=ro, align = $100;
       CODE:     load=ROM, type=ro, define=yes;
       DATA:     load=ROM, run=RAM, type=rw, define=yes;
       BSS:      load=RAM, type=bss, define=yes;
       ZEROPAGE: load=RAM, type=zp;
       TIA:      load=TIA, type=rw, define = yes, optional = yes;
       RIOT:     load=RIOT, type=rw, define = yes, optional = yes;
}

I snarfed these online as I was trying to figure out the assembler/linker. I can assemble the above code but putting in the emulator and turning on the 130XE just shows a black screen.

 

I presume my cartridge code must do something else, right? Initialize the screen somehow?

 

[+DrVenkman]

On 5/9/2020 at 9:30 PM, David_P said:

Default carts with no bank switching are a maximum of 16K, occupying memory from $8000-BFFF.  You can order 16K boards (27128 EEPROM compatible) from OSH Park - https://oshpark.com/shared_projects/YreZRvio

 

 

Pardon the aside, but I just looked at that OSH Park link. Is that PCB really almost $30 each?!? 

[+David_P]

OSH prices are usually for a set of three, and can be significantly lowered by ordering in large quantities. Also, I think they are produced in the USA, so shipping is generally faster.

[_The Doctor__]

still even if that's the case $10.00 a piece for something of so little complexity or size...

[+Nezgar]

Currently OSH park's system quotes $29.45 for 3. 

 

And $58.90 for 10 as part of a "medium run" order.

[TGB1718]

On 5/27/2020 at 9:54 PM, boisy said:

I presume my cartridge code must do something else, right? Initialize the screen somehow?

 

You might need to do something like this, it opens a text screen

this was done in MAC/65

 

0100     .INCLUDE #D:HEADER.M65 ; SYSTEM EQUATES
0110     *=  $0600
0120 CHANNEL1 LDA #CLOSE
0130     LDX #$10
0140     STA ICCOM,X
0150     JSR CIOV
0160     LDA #0      ; RESERVE MEMORY
0170     STA APPMHI  ; FOR NEW SCREEN
0180     LDA #$80    ; ELSE OPEN WILL
0190     STA APPMHI+1 ; FAIL
0200     LDA #OPEN
0210     STA ICCOM,X
0220     LDA #NAME1&255
0230     STA ICBAL,X
0240     LDA #NAME1/256
0250     STA ICBAH,X
0260     LDA #3
0270     STA ICBLL,X
0280     LDA #0
0290     STA ICBLH,X
0300     LDA #$0C    ;R/W
0310     STA ICAX1,X
0320     LDA #0      ; TEXT SCREEN
0330     STA ICAX2,X
0360     JSR CIOV
0370 ZZ  JMP ZZ   ; YOUR CODE GOES HERE
0380 NAME1 .BYTE "S:",$9B
0390     .OPT NO LIST