Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-07-04 09:28:51 +03:00
Code Issues Actions 4 Packages Projects Releases Wiki Activity

Added external clock to SCC and decoded SCC synchronous init for MacOS 7

Browse Source
This commit is contained in:
Joakim Larsson Edstrom 2016-11-04 12:01:52 +01:00
parent a23be114ea
commit 195f827c63
1 changed files with 23 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
src/mame/drivers/mac128.cpp
View File

@ -107,6 +107,7 @@ c0 8 data bits, Rx disabled
#define OVERLAY_TAG "bank1"
#define C7M (7833600)
#define C3_7M (3916800)
// uncomment to run i8021 keyboard in original Mac/512(e)/Plus
//#define MAC_USE_EMULATED_KBD (1)
@ -1283,7 +1284,7 @@ static MACHINE_CONFIG_START( mac512ke, mac128_state )
MCFG_IWM_ADD("fdc", mac_iwm_interface)
MCFG_LEGACY_FLOPPY_SONY_2_DRIVES_ADD(mac_floppy_interface)
MCFG_SCC85C30_ADD("scc", C7M, 0, 0, 0, 0)
MCFG_SCC85C30_ADD("scc", C7M, C3_7M, 0, C3_7M, 0)
MCFG_Z80SCC_OUT_INT_CB(WRITELINE(mac128_state, set_scc_interrupt))
MCFG_DEVICE_ADD("via6522_0", VIA6522, 1000000)
@ -1514,7 +1515,27 @@ ROM_END
* 00 <- 10 Reset External/status interrupts
* 01 <- 01 Enable External Interrupts
* Above init first for channel B and then for channel A
* 09 <- 0a Master Interrup Control: No vector and Interrupts enabled!
* 09 <- 0a Master Interrupt Control: No vector and Interrupts enabled!
*
SCC re-init of Channel B booting MacOS 7.0.0 (on Mac plus)
* 09 <- 40 Master Interrup Control: channel B reset
* 04 <- 20 x1 clock, Sync Modes Enable, SDLC Mode (01111110 Flag)
* 0a <- e0 CRC preset to '1's, FM0 encoding scheme
* 06 <- 00 Receiver SDLC ADR0-ADR7 bits
* 07 <- 7e Receiver SDLC Flag character (0x7e as expected)
* 0c <- 06 Low baudrate divider
* 0d <- 00 Hi baudrate divider
* 0e <- c0 Set FM Mode Command
* 03 <- dd Rx 8 bit, Enter Hunt Mode, Rx CRC Enable, Enter SDLC Address Search Mode, Rx enable
* 02 <- 00 Interrupt vector
* 0f <- 08 External/Status Control: DCD interrupts enabled
* 01 <- 09 Enable External Interrupts + Rx Int On First Character or Special Condition
* 09 <- 0a Master Interrupt Control: No vector and Interrupts enabled!
* 0b <- 70 Rx Clock is DPLL Output, Tx Clock is BRG output + TTL Clock on RTxC
* 0e <- 21 Enter Search Mode Command + BRG enable + RTxC as BRG clock
* 05 <- 60 Tx 8 bit, Tx disable, SDLC CRC Polynomial selected, Tx CRC disabled
* 06 <- 01 Receiver SDLC ADR0-ADR7 bits updated
* 0f <- 88 External/Status Control: Abort/Break and DCD interrupts enabled
*/
ROM_START( mac512ke )