mirror of
https://github.com/mgcaret/rom4x.git
synced 2024-05-28 21:41:31 +00:00
c4b1070329
I discovered that there are more than one ProDOS boot block in the wild, so I simplified the check for recoverable RAM disk to check card for $01 and then anything besides $00 and $FF since most uninitialized RAM tends to have one of those two values. This is slightly more rigid than the boot code checks for. I added a jump to AppleSoft if no bootable device is found. I changed the message a little bit, too. I also added notes about the feasibility of using the RamFactor firmware.
62 lines
1.5 KiB
Plaintext
62 lines
1.5 KiB
Plaintext
; hardware
|
|
rombank = $c028
|
|
butn0 = $c061
|
|
butn1 = $c062
|
|
kbd = $c000
|
|
kbdstrb = $c010
|
|
addrl = $bff8
|
|
addrm = $bff9
|
|
addrh = $bffa
|
|
data = $bffb
|
|
|
|
; screen holes
|
|
; same as //c firmware listing, need to add $c4 for mem card in slot 4
|
|
sl_scrn1 = $478 - $c0
|
|
sl_scrn2 = $4f8 - $c0
|
|
sl_scrn3 = $578 - $c0
|
|
sl_scrn4 = $5f8 - $c0
|
|
sl_scrn5 = $678 - $c0
|
|
sl_scrn6 = $6f8 - $c0
|
|
sl_scrn7 = $778 - $c0
|
|
sl_scrn8 = $7f8 - $c0
|
|
numbanks = sl_scrn1
|
|
pwrup = sl_scrn7
|
|
; next loc is commented in firmware listing, but apple engineers
|
|
; planned on a more sophisticated power-up check that they didn't do
|
|
; we will repurpose this to store selected closed-apple menu item
|
|
power2 = sl_scrn8
|
|
sl_devno = $778
|
|
|
|
; locations
|
|
softev = $3f2
|
|
pwerdup = $3f4
|
|
cv = $25
|
|
|
|
; values
|
|
pwrbyte = $a5
|
|
rx_slot = $4
|
|
rx_mslot = rx_slot + $c0
|
|
rx_devno = rx_slot * $10 + $88
|
|
|
|
; entry points
|
|
gorst4x = $c763 ; switch to/from reset4x
|
|
gobt4x = gorst4x + 6 ; switch to/from boot4x
|
|
gobanner = gobt4x + 6 ; banner from bank 1
|
|
rst4xrtn = $facb ; where to return from reset4x
|
|
;bt4xrtn = $fb12 ; where to return from boot4x
|
|
bt4xrtn = $fb19 ; where to return from boot4x
|
|
reset4x = $e000 ; reset routine
|
|
boot4x = $e180 ; boot routine
|
|
nbtfail = $e300 ; new boot fail
|
|
banner = $fb60 ; 'Apple //c'
|
|
testsize = $d99f ; test ramdisk size (rom 3 = $d995)
|
|
monitor = $ff59 ; monitor
|
|
swrts2 = $c784 ; switch firmware and rts
|
|
basic = $e000 ; BASIC cold start entry point
|
|
coma = $c55d ; location of coma routine
|
|
setnorm = $fe84 ; normal video
|
|
init = $fb2f ; init screen
|
|
setvid = $fe93 ; init output
|
|
setkbd = $fe89 ; init input
|
|
|