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More progress on OSGBPB.

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Bobbi Webber-Manners 2022-09-19 00:02:28 -04:00
parent bc98a80e74
commit a32db137ce
2 changed files with 25 additions and 6 deletions
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3
auxmem.hostfs.s
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@ -63,7 +63,7 @@ OSFINDRET >>> ENTAUX
* Supports commands A=1,2,3,4 others unsupported
GBPBHND CMP #4
BCC :S1
RTS
RTS ; Not supported: regs unchanged
:S1 PHX
PHY
PHA
@ -85,6 +85,7 @@ OSGBPBRET >>> ENTAUX
PLY
PLX
LDA #$00 ; A=0 means supported command
CLC ; SHOULD SET CARRY IF EOF
RTS
* OSBPUT - write one byte to an open file

28
mainmem.svc.s
View File

@ -329,8 +329,23 @@ CFILE >>> ENTMAIN
* A=4 : Read bytes from disk, ignoring seq pointer
* All others unsupported
GBPB >>> ENTMAIN
* ...
LDY GBPBHDL ; File ref number
*
* TODO: THIS ALWAYS READS ATM, NEEDS TO WRITE ALSO!!
*
LSR A ; Test LSB of A
BCC :NOSEEK ; A=2 or 4, no seek
LDA GBPBHDL ; File ref number
STA GMARKPL+1
LDY #$02 ; Copy file pointer
:L0 LDA GBPBPTR+0,Y
STA GMARKPL+2,Y
DEY
BMI :L0
JSR MLI ; Perform seek
DB SMARKCMD
DW GMARKPL
BCS :ERR
:NOSEEK LDY GBPBHDL ; File ref number
STY READPL2+1
:L1 JSR MLI ; Read one byte
DB READCMD
@ -347,12 +362,15 @@ GBPB >>> ENTMAIN
INC GBPBDAT+0 ; Increment data pointer
BNE :S1
INC GBPBDAT+1
:S1 LDA GBPBNUM+0 ; Decrement number of bytes
:S1 INC GBPBPTR+0 ; Increment file pointer
BNE :S2
INC GBPBPTR+1
:S2 LDA GBPBNUM+0 ; Decrement number of bytes
BNE :S3
LDA GBPBNUM+1
BEQ :ZERO ; Zero remaining, done!
DEC GBPBNUM+1
:S2 DEC GBPBNUM+0
:S3 DEC GBPBNUM+0
BRA :L1
* ...
:ERR
@ -360,7 +378,7 @@ GBPB >>> ENTMAIN
STA ZPMOS+0 ; .. to aux memory
LDA GBPBAUXCB+1
STA ZPMOS+1
LDY #$0C+1
LDY #$0C
>>> WRTAUX
:L2 LDA GBPBBLK,Y
STA (ZPMOS),Y