cadr4

Experiments of the third kind... This is an attempt at making a faithful and accurate HDL implementation of CADR. There will be no attempt at making this synthesizable!

Random chit-chat

There is a IRC channel on irc.libera.net, ##lispm for random chit-chat. Feel free to send bugs directly to ams@gnu.org.

Setup

Prerequisites:

Fossil
Git
GNU Make
GHDL

Ideally using the GCC or LLVM code generator, since at some point there will be a simulatd UART to talk to the core.
GTKWave, vcd or some other VCD viewer.

cd ~/
git clone https://github.com/ams/cadr4
cd cadr4
make help

If writing or testing CADR microcode, then it is useful to have usim configured to be able to run CADRLP or the CADR Console debugger (CC).

Organization

ttl (package): contains all the ICs that are used by the CADR.
- sn74: 74xx logic.
- other: other ICs that do not fall into above categories.
- unsorted: contains skeletons directly translated from the schematics; these are to be deleted / merged at some point.
cadr4 (package):
- cpu.vhd: contains a exact transliteration of the original CADR schematics
- cadr4_tb.vhd: with a testbench that is capable of exercising the CADR.

New documentation should be written in Markdown. At some point this should be migrated back into the Lisp Machine Manual or other suitable places.

Name		Name	Last commit message	Last commit date
Latest commit History 319 Commits
.github/workflows		.github/workflows
doc/to-verify		doc/to-verify
rom		rom
ttl		ttl
.cursorrules		.cursorrules
.gitignore		.gitignore
CADR.md		CADR.md
CADR4.netlist		CADR4.netlist
COPYING		COPYING
Makefile		Makefile
README.md		README.md
ROADMAP.md		ROADMAP.md
STYLE.md		STYLE.md
TODO.org		TODO.org
cadr4_actl.vhd		cadr4_actl.vhd
cadr4_alatch.vhd		cadr4_alatch.vhd
cadr4_alu0.vhd		cadr4_alu0.vhd
cadr4_alu1.vhd		cadr4_alu1.vhd
cadr4_aluc4.vhd		cadr4_aluc4.vhd
cadr4_amem0.vhd		cadr4_amem0.vhd
cadr4_amem1.vhd		cadr4_amem1.vhd
cadr4_apar.vhd		cadr4_apar.vhd
cadr4_bcterm.vhd		cadr4_bcterm.vhd
cadr4_clock1.vhd		cadr4_clock1.vhd
cadr4_clock1_tb.vhd		cadr4_clock1_tb.vhd
cadr4_clock2.vhd		cadr4_clock2.vhd
cadr4_clockd.vhd		cadr4_clockd.vhd
cadr4_contrl.vhd		cadr4_contrl.vhd
cadr4_debug.vhd		cadr4_debug.vhd
cadr4_dram0.vhd		cadr4_dram0.vhd
cadr4_dram1.vhd		cadr4_dram1.vhd
cadr4_dram2.vhd		cadr4_dram2.vhd
cadr4_dspctl.vhd		cadr4_dspctl.vhd
cadr4_flag.vhd		cadr4_flag.vhd
cadr4_ictl.vhd		cadr4_ictl.vhd
cadr4_ior.vhd		cadr4_ior.vhd
cadr4_ipar.vhd		cadr4_ipar.vhd
cadr4_iram00.vhd		cadr4_iram00.vhd
cadr4_iram01.vhd		cadr4_iram01.vhd
cadr4_iram02.vhd		cadr4_iram02.vhd
cadr4_iram03.vhd		cadr4_iram03.vhd
cadr4_iram10.vhd		cadr4_iram10.vhd
cadr4_iram11.vhd		cadr4_iram11.vhd
cadr4_iram12.vhd		cadr4_iram12.vhd
cadr4_iram13.vhd		cadr4_iram13.vhd
cadr4_iram20.vhd		cadr4_iram20.vhd
cadr4_iram21.vhd		cadr4_iram21.vhd
cadr4_iram22.vhd		cadr4_iram22.vhd
cadr4_iram23.vhd		cadr4_iram23.vhd
cadr4_iram30.vhd		cadr4_iram30.vhd
cadr4_iram31.vhd		cadr4_iram31.vhd
cadr4_iram32.vhd		cadr4_iram32.vhd
cadr4_iram33.vhd		cadr4_iram33.vhd
cadr4_ireg.vhd		cadr4_ireg.vhd
cadr4_iwr.vhd		cadr4_iwr.vhd
cadr4_iwrpar.vhd		cadr4_iwrpar.vhd
cadr4_l.vhd		cadr4_l.vhd
cadr4_lc.vhd		cadr4_lc.vhd
cadr4_lcc.vhd		cadr4_lcc.vhd
cadr4_lpc.vhd		cadr4_lpc.vhd
cadr4_mctl.vhd		cadr4_mctl.vhd
cadr4_md.vhd		cadr4_md.vhd
cadr4_mds.vhd		cadr4_mds.vhd
cadr4_mf.vhd		cadr4_mf.vhd
cadr4_mlatch.vhd		cadr4_mlatch.vhd
cadr4_mmem.vhd		cadr4_mmem.vhd
cadr4_mo0.vhd		cadr4_mo0.vhd
cadr4_mo1.vhd		cadr4_mo1.vhd
cadr4_mskg4.vhd		cadr4_mskg4.vhd
cadr4_npc.vhd		cadr4_npc.vhd
cadr4_olord1.vhd		cadr4_olord1.vhd
cadr4_olord2.vhd		cadr4_olord2.vhd
cadr4_opcd.vhd		cadr4_opcd.vhd
cadr4_opcs.vhd		cadr4_opcs.vhd
cadr4_pctl.vhd		cadr4_pctl.vhd
cadr4_pdl0.vhd		cadr4_pdl0.vhd
cadr4_pdl1.vhd		cadr4_pdl1.vhd
cadr4_pdlctl.vhd		cadr4_pdlctl.vhd
cadr4_pdlptr.vhd		cadr4_pdlptr.vhd
cadr4_platch.vhd		cadr4_platch.vhd
cadr4_prom0.vhd		cadr4_prom0.vhd
cadr4_prom1.vhd		cadr4_prom1.vhd
cadr4_q.vhd		cadr4_q.vhd
cadr4_qctl.vhd		cadr4_qctl.vhd
cadr4_shift0.vhd		cadr4_shift0.vhd
cadr4_shift1.vhd		cadr4_shift1.vhd
cadr4_smctl.vhd		cadr4_smctl.vhd
cadr4_source.vhd		cadr4_source.vhd
cadr4_spc.vhd		cadr4_spc.vhd
cadr4_spclch.vhd		cadr4_spclch.vhd
cadr4_spcpar.vhd		cadr4_spcpar.vhd
cadr4_spcw.vhd		cadr4_spcw.vhd
cadr4_spy0.vhd		cadr4_spy0.vhd
cadr4_spy1.vhd		cadr4_spy1.vhd
cadr4_spy2.vhd		cadr4_spy2.vhd
cadr4_spy4.vhd		cadr4_spy4.vhd
cadr4_stat.vhd		cadr4_stat.vhd
cadr4_tb.gtkw		cadr4_tb.gtkw
cadr4_tb.vhd		cadr4_tb.vhd
cadr4_trap.vhd		cadr4_trap.vhd

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