Readme.md

PAL Code

The PAL chips on the 3202 CPU Board was programmedin in a language called PALASM

The PALASM (from "PAL assembler") language was developed by John Birkner in the early 1980s and 
the PALASM compiler was written by MMI in FORTRAN IV on an IBM 370/168. 

MMI made the source code available to users at no cost. By 1983, MMI customers ran versions on the DEC PDP-11, 
Data General NOVA, Hewlett-Packard HP 2100, MDS800 and others.

It was used to express boolean equations for the output pins in a text file which was then converted to the 'fuse map' 
file for the programming system using a vendor-supplied program; 

later the option of translation from schematics became common, and later still, 'fuse maps' could be 'synthesized' from an HDL (hardware description language) such as Verilog.

PALASM Language guide

• http://orion.ipt.pt/~fmbarros/ed/PALASM%20Language%20Guide.htm

PALASM Software

• http://www.pldworld.com/_otherplds/palasm/-engr.uky.edu/_melham01/ee481/software.htm
• http://www.brouhaha.com/~eric/retrocomputing/mmi/palasm/

PALASM Under Linux

• https://systemembedded.eu/viewtopic.php?t=43

References:

• https://en.wikipedia.org/wiki/PALASM

• https://en.wikipedia.org/wiki/Programmable_Array_Logic

• HDL Windows Designer Compatible with the PALASM Platform

• MMI Datebook" with PALASM examples and users guide

From 3202D Design documentaion

PAL's for board no. 3202. ND120/CX. Last update 27. January 1988. Standard is 4Mb memory configured contiguosly from address 0.

Pos. no.	3202D Sheet	Checksum	Device	Max. delay	Stock no.	Reg. no.	Mnemonic	PALASM Image	PALASM SRC (PDS format)	Converted to Verilog
11D	12	3B8B	16L8-12	12ns	513035	44302B	LBC1	B IMG	B PDS	Converted. Needs more test
2C	12	3932	16L8-12	12ns	513085	44303B	LBC2	B IMG	B PDS	Converted. Needs more test
1C	12	508A	16L8-12	12ns	5130385	44304E	LBC3	E IMG	E PDS	Converted. Needs more test. Especially on signal EBADR_n
15F	18		16L8-12	12ns	513085	44305D	CSCTL	D IMG	D PDS	Converted. Needs more test
21G	24	7856	16L8-12	12ns	513035	44306A	MMUCTL	A IMG	A PDS	Converted. Needs more test
13D	36	8345	16L8-12	12ns	513085	44307C	CYCLK	C IMG	C PDS	Converted. Needs more test
3F	48	46FA	16L8-12	12ns	513085	44310D	LBDIF	D IMG	D PDS	Converted. Tested!
5D	6	59AF	16R4D	10ns	513060	44401B	BTIM	B IMG	B PDS	Converted.. Needs more test
18F	25		16R4D	10ns	513060	44402D	UBITS	D IMG	D PDS	Converted.. Needs more test
14D	36		16R4D	10ns	513060	44403D	CYIN0	C IMG / D IMG	C PDS / Missing D	Converted C Needs more test
15D	36		16R4D	10ns	513060	44404D	CYIN1 NEW	C IMG / Missing D	C PDS / Missing D	Converted C Needs more test. Guessed at logics for D..
19F	34	OF93	16R4D	10ns	513060	44407A	ERFIX	A IMG	A PDS	Converted. Tested!
9G	45	44C7	16R4D	10ns	513060	44445B	CADEC	B IMG	B PDS	Converted. Tested!
6G	45	3EF5	16R4D	10ns	513060	44446B	BADEC	B IMG	B PDS	Converted. Tested!
22F	34	3160	16R4D	10ns	513060	44408B	VEXFIX	B IMG	B PDS	Converted.. Tested!
22F	34		16R6D	10ns	513061	44608A	VXFIX	Missing	Missing	PAL 44608A replaces the 44408B in the schematic. We dont have PAL source. Until we do, use PAL 44408B and take RT_n signal from DGA
12D	36	7F40	16R6D	10ns	513061	44601B	CYCFSM	B IMG	B PDS	Converted. Needs more test
10D	6	6B08	16R8D	10ns	513062	44801A	BARB	A IMG	A PDS	Converted. Needs more test
5F	50	605E	16R8D	10ns	513062	44803A	RAMA	A IMG	A PDS	Converted. Needs more test
6F	50		16R8B	15ns	500829	44902A	RAMC	A IMG	A PDS	Converted. Needs more test
7G	45	48B4	16R8B	15ns	500829	44904B	MSIZE	B IMG	B PDS	Converted. Needs more test
8D	6	5963	16L8B	15ns	500827	45001B	BPAR	B IMG	B PDS	Converted. Needs more test
2F	46		16L8B	15ns	500827	45008B	DATA	B IMG	B PDS	Converted. Needs more test
4F	47	43ED	16L8B	15ns	500827	45009B	ERROR	B IMG	B PDS	Converted. Needs more test
26H	34		16R4B	15ns		44511A	LEVO	A IMG	A PDS	Converted. Needs more test

Note on 22F:

• 22F was 44408B/VEXFIX and has been replaced with 44608A/VXFIX - but we are missing the PALASM source code for 44608A.
• RT_n signal from DGA is from DECODE_DGA_COMM. Maybe the DGA wasnt fast enough to decode the signal ?
• Decoded the HW description for RT_n inside DGA: ** RT_n is low when One of the following command 23,24,27, 30,31, 32,33, 34, 35, 22.0, 22.1, 22.3 AND when LCS_n = HIGH (not active) (and is updated on CLK signal going low-high)

2MB

PAL's for board no. 3202. ND120/CX 2Mb version.

Replace 44445xX with 44425x, and 44446X with 44426x. 9G 411E 16R4D 10ns 513060 444258 CADEC 6G 42EF 16R4D 10ns 513060 44426B BADEC

6MB

PAL's for board no. 3202. ND120/CX 6Mb version.

Replace 44445X with 44465xX, and 44446X with 44466x.

Pos. no.	Checksum	Device	Max. delay	Stock no.	Reg. no.	Mnemonic	PALASM Image	PALASM SRC (PDS format)
9G	4441	16R4D	10ns	513060	44465B	CADEC	B IMG	B PDS
6G	42EF	16R4D	10ns	513060	44466B	BADEC	B IMG	B PDS

STD

PAL's for board no. 3202. ND120 STD. Replace 44402X with 44412X, and 44601X with 44611x.

Pos. no.	Checksum	Device	Max. delay	Stock no.	Reg. no.	Mnemonic	PALASM IMG
18F		16R4D	10ns	513060	44412A	UBITS NEW
12D		16R6D	10ns	513061	44611A	CYCFSM NEW

PROM's

Microcode PROM's. One set for 32 bit FPU and one set for 48 Bit FPU opcodes.

Pos. no.	Checksum	Device	Max. delay	Stock no.	Reg. no.	Floating format	Bit no.
23B		27256	250ns	500854	45132L	32 bit	0-7
26B		27256	250ns	500854	45133L	32 bit	8-15
23B		27256	250ns	500854	45148L	48 bi	0-7
26B		27256	250ns	500854	45149L	48 bi	8-15