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add paged RAM/ROM card (WIP)

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Scott Alfter
2022-07-21 23:41:04 -07:00
parent d7c60572e7
commit 81350e1d72
7 changed files with 8123 additions and 0 deletions
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23
README.md
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@@ -134,6 +134,29 @@ is also jumper-selectable.
This board has its own 7.3728-MHz crystal oscillator, making it independent
of CPU speed. (I'm aiming for 10 MHz with both of my CPU boards.)
paged-ram-rom
-------------
This started out as a copy of the schematic from
[the RC2014 GitHub](https://github.com/RC2014Z80/RC2014/tree/master/Hardware/512kROMRAM%20RC2014).
I brought it into KiCad 6, replaced the "rescued" symbols from the original
with more current ones in the KiCad library, redid the connections in what I
think is an easier-to-follow style (global labels instead of buses), and
(TODO) re-did the PCB layout from scratch (since that wasn't included). I
might also swap out SMDs for through-hole parts, except possibly for the
flash chip that needs to get its initial programming before installation.
I was having some trouble puzzling out how the I/O decoding worked in the
original schematic. I found [this page](https://bread80.com/2020/06/27/understanding-the-rc2014-512k-rom-512k-ram-board/)
that described how the board worked, and once I had redone the schematic
with the newer symbols, it became clear what was going on. In particular,
the newer symbols for the 74LS139 have the selection pins labeled A1 and A0
instead of A and B. Looking back now at the function table on page 1 of the
[TI datasheet](https://www.ti.com/lit/ds/symlink/sn74s139a.pdf?HQS=dis-dk-null-digikeymode-dsf-pf-null-wwe&ts=1658471109258&ref_url=https%253A%252F%252Fwww.ti.com%252Fgeneral%252Fdocs%252Fsuppproductinfo.tsp%253FdistId%253D10%2526gotoUrl%253Dhttps%253A%252F%252Fwww.ti.com%252Flit%252Fgpn%252Fsn74s139a),
I see that the "select" column headings are in reverse alphabetical order
(B, then A). That must've escaped me while I was trying to puzzle out the
schematic.
new-board.sh
------------

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paged-rom-ram/fp-info-cache Normal file
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1611
paged-rom-ram/paged-rom-ram.kicad_pcb Normal file
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75
paged-rom-ram/paged-rom-ram.kicad_prl Normal file
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@@ -0,0 +1,75 @@
{
"board": {
"active_layer": 0,
"active_layer_preset": "All Layers",
"auto_track_width": true,
"hidden_nets": [],
"high_contrast_mode": 0,
"net_color_mode": 1,
"opacity": {
"pads": 1.0,
"tracks": 1.0,
"vias": 1.0,
"zones": 0.6
},
"ratsnest_display_mode": 0,
"selection_filter": {
"dimensions": true,
"footprints": true,
"graphics": true,
"keepouts": true,
"lockedItems": true,
"otherItems": true,
"pads": true,
"text": true,
"tracks": true,
"vias": true,
"zones": true
},
"visible_items": [
0,
1,
2,
3,
4,
5,
8,
9,
10,
11,
12,
13,
14,
15,
16,
17,
18,
19,
20,
21,
22,
23,
24,
25,
26,
27,
28,
29,
30,
32,
33,
34,
35,
36
],
"visible_layers": "fffffff_ffffffff",
"zone_display_mode": 0
},
"meta": {
"filename": "paged-rom-ram.kicad_prl",
"version": 3
},
"project": {
"files": []
}
}

420
paged-rom-ram/paged-rom-ram.kicad_pro Normal file
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@@ -0,0 +1,420 @@
{
"board": {
"design_settings": {
"defaults": {
"board_outline_line_width": 0.09999999999999999,
"copper_line_width": 0.19999999999999998,
"copper_text_italic": false,
"copper_text_size_h": 1.5,
"copper_text_size_v": 1.5,
"copper_text_thickness": 0.3,
"copper_text_upright": false,
"courtyard_line_width": 0.049999999999999996,
"dimension_precision": 4,
"dimension_units": 3,
"dimensions": {
"arrow_length": 1270000,
"extension_offset": 500000,
"keep_text_aligned": true,
"suppress_zeroes": false,
"text_position": 0,
"units_format": 1
},
"fab_line_width": 0.09999999999999999,
"fab_text_italic": false,
"fab_text_size_h": 1.0,
"fab_text_size_v": 1.0,
"fab_text_thickness": 0.15,
"fab_text_upright": false,
"other_line_width": 0.15,
"other_text_italic": false,
"other_text_size_h": 1.0,
"other_text_size_v": 1.0,
"other_text_thickness": 0.15,
"other_text_upright": false,
"pads": {
"drill": 0.762,
"height": 1.524,
"width": 1.524
},
"silk_line_width": 0.15,
"silk_text_italic": false,
"silk_text_size_h": 1.0,
"silk_text_size_v": 1.0,
"silk_text_thickness": 0.15,
"silk_text_upright": false,
"zones": {
"45_degree_only": false,
"min_clearance": 0.508
}
},
"diff_pair_dimensions": [],
"drc_exclusions": [],
"meta": {
"version": 2
},
"rule_severities": {
"annular_width": "error",
"clearance": "error",
"copper_edge_clearance": "error",
"courtyards_overlap": "error",
"diff_pair_gap_out_of_range": "error",
"diff_pair_uncoupled_length_too_long": "error",
"drill_out_of_range": "error",
"duplicate_footprints": "warning",
"extra_footprint": "warning",
"footprint_type_mismatch": "error",
"hole_clearance": "error",
"hole_near_hole": "error",
"invalid_outline": "error",
"item_on_disabled_layer": "error",
"items_not_allowed": "error",
"length_out_of_range": "error",
"malformed_courtyard": "error",
"microvia_drill_out_of_range": "error",
"missing_courtyard": "ignore",
"missing_footprint": "warning",
"net_conflict": "warning",
"npth_inside_courtyard": "ignore",
"padstack": "error",
"pth_inside_courtyard": "ignore",
"shorting_items": "error",
"silk_over_copper": "warning",
"silk_overlap": "warning",
"skew_out_of_range": "error",
"through_hole_pad_without_hole": "error",
"too_many_vias": "error",
"track_dangling": "warning",
"track_width": "error",
"tracks_crossing": "error",
"unconnected_items": "error",
"unresolved_variable": "error",
"via_dangling": "warning",
"zone_has_empty_net": "error",
"zones_intersect": "error"
},
"rules": {
"allow_blind_buried_vias": false,
"allow_microvias": false,
"max_error": 0.005,
"min_clearance": 0.0,
"min_copper_edge_clearance": 0.01,
"min_hole_clearance": 0.25,
"min_hole_to_hole": 0.25,
"min_microvia_diameter": 0.19999999999999998,
"min_microvia_drill": 0.09999999999999999,
"min_silk_clearance": 0.0,
"min_through_hole_diameter": 0.3,
"min_track_width": 0.19999999999999998,
"min_via_annular_width": 0.049999999999999996,
"min_via_diameter": 0.39999999999999997,
"solder_mask_clearance": 0.0,
"solder_mask_min_width": 0.0,
"use_height_for_length_calcs": true
},
"track_widths": [],
"via_dimensions": [],
"zones_allow_external_fillets": false,
"zones_use_no_outline": true
},
"layer_presets": []
},
"boards": [],
"cvpcb": {
"equivalence_files": []
},
"erc": {
"erc_exclusions": [],
"meta": {
"version": 0
},
"pin_map": [
[
0,
0,
0,
0,
0,
0,
1,
0,
0,
0,
0,
2
],
[
0,
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1,
0,
0,
1,
0,
2,
2,
2,
2
],
[
0,
0,
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1,
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1,
0,
1,
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],
[
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1,
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1,
1,
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],
[
0,
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2
],
[
0,
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0,
0,
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0,
0,
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],
[
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],
[
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2
],
[
0,
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],
[
0,
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],
[
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],
[
2,
2,
2,
2,
2,
2,
2,
2,
2,
2,
2,
2
]
],
"rule_severities": {
"bus_definition_conflict": "error",
"bus_entry_needed": "error",
"bus_label_syntax": "error",
"bus_to_bus_conflict": "error",
"bus_to_net_conflict": "error",
"different_unit_footprint": "error",
"different_unit_net": "error",
"duplicate_reference": "error",
"duplicate_sheet_names": "error",
"extra_units": "error",
"global_label_dangling": "warning",
"hier_label_mismatch": "error",
"label_dangling": "error",
"lib_symbol_issues": "warning",
"multiple_net_names": "warning",
"net_not_bus_member": "warning",
"no_connect_connected": "warning",
"no_connect_dangling": "warning",
"pin_not_connected": "error",
"pin_not_driven": "error",
"pin_to_pin": "warning",
"power_pin_not_driven": "error",
"similar_labels": "warning",
"unannotated": "error",
"unit_value_mismatch": "error",
"unresolved_variable": "error",
"wire_dangling": "error"
}
},
"libraries": {
"pinned_footprint_libs": [],
"pinned_symbol_libs": []
},
"meta": {
"filename": "paged-rom-ram.kicad_pro",
"version": 1
},
"net_settings": {
"classes": [
{
"bus_width": 12.0,
"clearance": 0.2,
"diff_pair_gap": 0.25,
"diff_pair_via_gap": 0.25,
"diff_pair_width": 0.2,
"line_style": 0,
"microvia_diameter": 0.3,
"microvia_drill": 0.1,
"name": "Default",
"pcb_color": "rgba(0, 0, 0, 0.000)",
"schematic_color": "rgba(0, 0, 0, 0.000)",
"track_width": 0.25,
"via_diameter": 0.8,
"via_drill": 0.4,
"wire_width": 6.0
}
],
"meta": {
"version": 2
},
"net_colors": null
},
"pcbnew": {
"last_paths": {
"gencad": "",
"idf": "",
"netlist": "",
"specctra_dsn": "",
"step": "",
"vrml": ""
},
"page_layout_descr_file": ""
},
"schematic": {
"annotate_start_num": 0,
"drawing": {
"default_line_thickness": 6.0,
"default_text_size": 60.0,
"field_names": [],
"intersheets_ref_own_page": false,
"intersheets_ref_prefix": "",
"intersheets_ref_short": false,
"intersheets_ref_show": false,
"intersheets_ref_suffix": "",
"junction_size_choice": 3,
"label_size_ratio": 0.25,
"pin_symbol_size": 0.0,
"text_offset_ratio": 0.08
},
"legacy_lib_dir": "",
"legacy_lib_list": [],
"meta": {
"version": 1
},
"net_format_name": "",
"ngspice": {
"fix_include_paths": true,
"fix_passive_vals": false,
"meta": {
"version": 0
},
"model_mode": 0,
"workbook_filename": ""
},
"page_layout_descr_file": "",
"plot_directory": "",
"spice_adjust_passive_values": false,
"spice_external_command": "spice \"%I\"",
"subpart_first_id": 65,
"subpart_id_separator": 0
},
"sheets": [
[
"ef07e5ec-62f3-459b-a8e7-589346a9df3b",
""
]
],
"text_variables": {}
}

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paged-rom-ram/paged-rom-ram.kicad_sch Normal file
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3
paged-rom-ram/sym-lib-table Normal file
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(sym_lib_table
(lib (name "512kROMRAM-rescue")(type "Legacy")(uri "${KIPRJMOD}/512kROMRAM-rescue.lib")(options "")(descr ""))
)