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// license:BSD-3-Clause
// copyright-holders:Vas Crabb
/*
imm6-26 PROM Memory Module
This card has sockets for sixteen 1702A or similar 256×8 PROMs providing
up to 4KiB of program storage. This card has additional features for
INTELLEC 8 systems, including module select lines and DIP switches for
mapping PROMs in place of console RAM. These features are not emulated
by this class.
In theory you could populate any combination of sockets, and use
multiple cards provided you don't populate corresponding sockets on two
cards. To simplify things, we assume contiguous sockets are populated
starting with PROM 0 (A2). In practice, you'd want to populate this
socket as the boot vector is at address zero. If you want to simulate
unpopulated sockets, just zero the corresponding area in your image
file.
Universal edge connector
1 2
GND 3 4 GND
5 6
7 8
9 10
MAD 0 11 12 MAD 1
MAD 2 13 14 MAD 3
MAD 4 15 16 MAD 5
MAD 6 17 18 MAD 7
MAD 8 19 20 MAD 9
21 22
MDI 0 23 24
MDI 1 25 26
MDI 3 27 28
MDI 2 29 30
MDI 5 31 32
MDI 4 33 34
MDI 7 35 36
MDI 6 37 38
39 40
41 42
-10V 43 44 -10V
45 46
47 48
49 50
51 52
53 54
55 56
/MAD 12 57 58 MS 12
MAD 13 59 60 MAD 12
MS 13 61 62 /MAD 13
/MAD 14 63 64 MS 14
MAD 15 65 66 MAD 14
MS 15 67 68 /MAD 15
69 70
71 72
73 74
75 76
77 78
79 80
81 82 /ASMB
83 84
85 86
87 88
89 90
/ADR STB 91 92
RAM MOD ENBL 93 94 MAD 11
95 96 MAD 10
/PROM MOD ENBL 97 98
+5V 99 100 +5V
MAD 0...MAD 7 mapped to MA0...MA7 on INTELLEC 4
MAD 8...MAD 11 mapped to C0...C3 on INTELLEC 4
MAD 12...MAD 15 not used on INTELLEC 4, used for module selection on INTELLEC 8
/MAD 12.../MAD 15 not used on INTELLEC 4, used for module selection on INTELLEC 8
MS 12...MS 15 not used on INTELLEC 4, used for module selection on INTELLEC 8
MDI 0...7 data outputs
/ASMB global enable mapped to /PROM SEL on INTELLEC 4, not jumpered in on INTELLEC 8
/ADR STB not jumpered in on INTELLEC 4 and INTELLEC 8, latch enables jumpered to GND
RAM MOD ENBL not jumpered in on INTELLEC 4, allows PROM to overlay RAM on INTELLEC 8
/PROM MOD ENBL not jumpered in on INTELLEC 4, used as global enable on INTELLEC 8
*/
#include "emu.h"
#include "prommemory.h"
namespace {
class imm6_26_device
: public device_t
, public bus::intellec4::device_univ_card_interface
, public device_image_interface
{
public:
imm6_26_device(machine_config const &mconfig, char const *tag, device_t *owner, const XTAL &clock);
virtual image_init_result call_load() override;
virtual void call_unload() override;
virtual bool is_readable() const noexcept override { return true; }
virtual bool is_writeable() const noexcept override { return false; }
virtual bool is_creatable() const noexcept override { return false; }
virtual bool is_reset_on_load() const noexcept override { return false; }
virtual char const *file_extensions() const noexcept override { return "rom,bin"; }
virtual char const *image_type_name() const noexcept override { return "promimage"; }
virtual char const *image_brief_type_name() const noexcept override { return "prom"; }
protected:
virtual void device_start() override;
private:
void allocate();
void unmap();
std::unique_ptr<u8 []> m_data;
};
imm6_26_device::imm6_26_device(machine_config const &mconfig, char const *tag, device_t *owner, const XTAL &clock)
: device_t(mconfig, INTELLEC4_PROM_MEMORY, tag, owner, clock)
, bus::intellec4::device_univ_card_interface(mconfig, *this)
, device_image_interface(mconfig, *this)
, m_data()
{
}
image_init_result imm6_26_device::call_load()
{
if ((length() > 4096U) || (length() % 256U))
return image_init_result::FAIL;
unmap();
allocate();
if (fread(m_data.get(), length()) != length())
return image_init_result::FAIL;
// FIXME: gimme a cookie!
rom_space().install_rom(0x1000U, offs_t(0x1000U + length()), m_data.get());
return image_init_result::PASS;
}
void imm6_26_device::call_unload()
{
unmap();
}
void imm6_26_device::device_start()
{
allocate();
save_pointer(NAME(m_data), 4096U);
}
void imm6_26_device::allocate()
{
if (!m_data)
{
m_data = std::make_unique<u8 []>(4096U);
std::fill(m_data.get(), m_data.get() + 4096U, 0U);
}
}
void imm6_26_device::unmap()
{
// FIXME: where's my magic cookie?
rom_space().unmap_read(0x1000U, 0x1fffU);
}
} // anonymous namespace
DEFINE_DEVICE_TYPE_PRIVATE(INTELLEC4_PROM_MEMORY, bus::intellec4::device_univ_card_interface, imm6_26_device, "intlc4_imm6_26", "Intel imm6-26 PROM Memory Module")
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