UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

ortek_service · 10th May 2021, 12:25 am

The M6800_Microprocessor_Applications_Manual_1975 is amongst similar ones, here: http://bitsavers.trailing-edge.com/c...motorola/6800/
- But it seems too old to include the PDS, and only has the (original?) EXORciser

I found there is actually quite a bit of info on the various boards & M68MD1 5" CRT Monitor / M68MPR1 Printer etc. parts of the PDS in the 1979 catalogue: http://bitsavers.trailing-edge.com/c...nt_Systems.pdf
- However it's a bit all over the place, with searching on "Polyvalent" the easiest way of finding everything in it.

Confusing there seems to be several different ones in the Polyvalent Development Systems Family, which all use the same M68SAC1 (921.6KHz) Stand Alone Computer board etc.:
- M68TDS1 to M68TDS4 M6800 Total Development Systems (TDS)
- The M68ADS / ADW. Autonomous Development Systems
- The M68MEB1 Microprocessor Evaluation Board

Even more confusing, is there's a M68PPR2 PDS PROM Programmer (for the PDS-systems) board - on page 1-89 of the 1979 catalogue, that says 'uses the +5V ± 12V PDS pus power supply', but only lists support for 6 main Motorola (TTL Fusible link PROM's & EPROMs) IC types: MCM7640, MCM7680, MCM68708/2708 (3-rail), MCM7641, MCM7681, TMS2716 (3-rail)

Whereas, your picture shows the MEX68PP3 EROM/PROM Programmer Module (for the EXORciser-system), which says 'EXORciser and Micromodule Family bus compatible' and '57 different EROMs and PROMs can be programmed' - Inc. MCM2716, Intel-2716, Intel-2758 (single-rail) devices in my 1978 2nd Ed, User's Guide for this.

However, as both use the same 86-pin backplane edge-connector, it seemed odd they had these 2 similar-looking but different versions.
- Although it appears the MEX68PP3 does support single-rail EPROM's, that might not be supported by the (maybe lower-cost) M68PPR2
(Plus I don't know if the clock on the EXORciser is 2MHz clock - rather than just under 1MHz on the PDS M68SAC1 board).

10th May 2021, 12:25 am	#68
ortek_service Octode Join Date: May 2018 Location: Northampton, Northamptonshire, UK. Posts: 1,440	Re: Early EPROM programmer. The M6800_Microprocessor_Applications_Manual_1975 is amongst similar ones, here: http://bitsavers.trailing-edge.com/c...motorola/6800/ - But it seems too old to include the PDS, and only has the (original?) EXORciser I found there is actually quite a bit of info on the various boards & M68MD1 5" CRT Monitor / M68MPR1 Printer etc. parts of the PDS in the 1979 catalogue: http://bitsavers.trailing-edge.com/c...nt_Systems.pdf - However it's a bit all over the place, with searching on "Polyvalent" the easiest way of finding everything in it. Confusing there seems to be several different ones in the Polyvalent Development Systems Family, which all use the same M68SAC1 (921.6KHz) Stand Alone Computer board etc.: - M68TDS1 to M68TDS4 M6800 Total Development Systems (TDS) - The M68ADS / ADW. Autonomous Development Systems - The M68MEB1 Microprocessor Evaluation Board Even more confusing, is there's a M68PPR2 PDS PROM Programmer (for the PDS-systems) board - on page 1-89 of the 1979 catalogue, that says 'uses the +5V ± 12V PDS pus power supply', but only lists support for 6 main Motorola (TTL Fusible link PROM's & EPROMs) IC types: MCM7640, MCM7680, MCM68708/2708 (3-rail), MCM7641, MCM7681, TMS2716 (3-rail) Whereas, your picture shows the MEX68PP3 EROM/PROM Programmer Module (for the EXORciser-system), which says 'EXORciser and Micromodule Family bus compatible' and '57 different EROMs and PROMs can be programmed' - Inc. MCM2716, Intel-2716, Intel-2758 (single-rail) devices in my 1978 2nd Ed, User's Guide for this. However, as both use the same 86-pin backplane edge-connector, it seemed odd they had these 2 similar-looking but different versions. - Although it appears the MEX68PP3 does support single-rail EPROM's, that might not be supported by the (maybe lower-cost) M68PPR2 (Plus I don't know if the clock on the EXORciser is 2MHz clock - rather than just under 1MHz on the PDS M68SAC1 board). Last edited by ortek_service; 10th May 2021 at 12:37 am.