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(MESS) ngen: added notes on entering menu mode and the Panel Debugger.

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This commit is contained in:
mahlemiut 2014-12-04 14:58:05 +13:00
parent 25b58985a1
commit f473159504
1 changed files with 42 additions and 2 deletions
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44
src/mess/drivers/ngen.c
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@ -9,6 +9,46 @@
level 3 - timer (from PIT, presumably channel 0? Patent says "channel 3")
level 4 - "interrupt detector" - keyboard, printer, RTC
level 7 - floppy/hard disk
To get to "menu mode", press Space quickly after reset (might need good timing)
The bootstrap ROM version number is displayed, along with "B,D,L,M,P,T:"
You can press one of these keys for the following tests:
B: Bootstrap
Loads the system image file (from disk or master workstation)
D: Dump
RAM contents are dumped to a local disk drive or master workstation
L: Load
Loads the system image file, then enters the Panel Debugger. Exiting the Panel
Debugger will continue execution of the system image
M: Memory Test
Continuously performs the Memory Test until the system is reset.
P: Panel Debugger
Enters the Panel Debugger
T: Type of Operating System
Gives an "OS:" prompt, at which you can enter the number of the system image to
load at the master workstation.
Panel Debugger:
- Open/Modify RAM
Enter an address (seg:off) followed by a forward-slash, the contents of this word will
appear, you can enter a value to set it to, or just press Next (default: Enter) to leave
it as is. It will then go on to the next word. Pressing Return (scan code unknown
currently) will return to the debugger prompt.
- Open/Modify Register
Enter the register only, and the contents will appear, you can leave it or alter it (you
must enter all digits (eg: 0A03 if you're modifying DX) then press Return.
- I/O to or from a port
Input: Address (segment is ignored, and not required) followed by I, a byte is read from
the port defined by the offset, and the byte is displayed.
Output: Address followed by O, you are now prompted with an '='. Enter the byte to send
to the port, and press Return.
- Set Haltpoint:
Enter an address (seg:off) followed by H. Sets a haltpoint at the specified address. Does
not work for ROM addresses. Only one allowed at a time. Haltpoint info is stored at
0000:01F0. Uses a software interrupt (INT 7C), rather than INT 3.
To start or continue from the current address, enter P.
To start from a specific address, enter the address (seg:off) followed by a G.
*/
#include "emu.h"
@ -303,7 +343,7 @@ READ16_MEMBER(ngen_state::peripheral_r)
ret = m_viduart->status_r(space,0);
break;
case 0x1a0: // I/O control register?
ret = m_control; // end of DMA transfer? (maybe a per-channel EOP?) Add a '| 0x40' to force a serial I/O failure, so that the keyboard can be tested
ret = m_control; // end of DMA transfer? (maybe a per-channel EOP?) Bit 6 is set during a transfer?
break;
case 0x1b1:
ret = 0;
@ -542,7 +582,7 @@ MACHINE_CONFIG_END
ROM_START( ngen )
ROM_REGION( 0x2000, "bios", 0)
ROM_LOAD16_BYTE( "72-00414_80186_cpu.bin", 0x000000, 0x001000, CRC(e1387a03) SHA1(ddca4eba67fbf8b731a8009c14f6b40edcbc3279) )
ROM_LOAD16_BYTE( "72-00414_80186_cpu.bin", 0x000000, 0x001000, CRC(e1387a03) SHA1(ddca4eba67fbf8b731a8009c14f6b40edcbc3279) ) // bootstrap ROM v8.4
ROM_LOAD16_BYTE( "72-00415_80186_cpu.bin", 0x000001, 0x001000, CRC(a6dde7d9) SHA1(b4d15c1bce31460ab5b92ff43a68c15ac5485816) )
ROM_END